WESTERN GAS RESOURCES INC
424B3, 1999-10-19
NATURAL GAS TRANSMISSION
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<PAGE>
                                                Filed Pursuant to Rule 424(b)(3)
                                                             File No.: 333-86881

PROSPECTUS

                               EXCHANGE OFFER FOR

                                  $155,000,000

               [LOGO OF WESTERN GAS RESOURCES, INC. APPEARS HERE]

                     10% SENIOR SUBORDINATED NOTES DUE 2009

   This exchange offer will expire at midnight, New York City Time, on November
18, 1999, unless extended.

                          TERMS OF THE EXCHANGE OFFER:

  . We are offering a total of $155,000,000 of exchange notes, which are
    registered with the Securities and Exchange Commission, to all holders of
    old notes.

  . We will exchange exchange notes for all old notes that are validly
    tendered and not withdrawn prior to the expiration of the exchange offer.

  . You may withdraw tenders of old notes at any time before the exchange
    offer expires.

  . We will not receive any proceeds from the exchange offer.

  . We believe that the exchange of notes will not be a taxable exchange for
    United States federal income tax purposes, but you should see the section
    entitled "Certain United States Federal Income Tax Consequences" on page
    102 for more information.

  . The terms of the exchange notes are substantially identical to those of
    the old notes, except for transfer restrictions and registration rights
    relating to the old notes.

  . The old notes are, and the exchange notes will be, guaranteed by the
    subsidiary guarantors set forth in this prospectus.

  . There is no existing market for the exchange notes, and we do not intend
    to apply for their listing on any securities exchange.

   See the "Description of Notes" section on page 64 for more information about
the exchange notes.

   THIS INVESTMENT INVOLVES RISKS. SEE THE SECTION ENTITLED "RISK FACTORS" THAT
BEGINS ON PAGE 11 FOR A DISCUSSION OF THE RISKS THAT YOU SHOULD CONSIDER PRIOR
TO TENDERING YOUR OLD NOTES FOR EXCHANGE.

   NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE NOTES OR PASSED UPON THE
ADEQUACY OR THE ACCURACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY
IS A CRIMINAL OFFENSE.

                The date of this prospectus is October 19, 1999.
<PAGE>

<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
Disclosure Regarding Forward-Looking Statements...........................    i
Incorporation of Certain Documents by Reference...........................    i
Available Information.....................................................   ii
Certain Definitions.......................................................   ii
Prospectus Summary........................................................    1
Summary Consolidated Financial and Operating Data.........................   10
Risk Factors..............................................................   11
Use of Proceeds...........................................................   20
Accounting Treatment......................................................   20
Capitalization............................................................   21
Pro Forma Consolidated Financial Statements...............................   21
Consolidated Historical Financial and Operating Data......................   25
The Exchange Offer........................................................   26
Management's Discussion and Analysis of Financial Condition and Results of
 Operations...............................................................   34
Business..................................................................   45
Management................................................................   60
Description of Other Indebtedness.........................................   62
Description of Notes......................................................   64
Certain United States Federal Income Tax Consequences.....................  102
Plan of Distribution......................................................  105
Legal Matters.............................................................  105
Experts...................................................................  105
Independent Accountants...................................................  106
Index to Consolidated Financial Statements................................  F-1
</TABLE>
<PAGE>

                DISCLOSURE REGARDING FORWARD-LOOKING STATEMENTS

   This prospectus contains "forward-looking statements" within the meaning of
the Private Securities Litigation Reform Act of 1995, which can be identified
by the use of forward-looking terminology, such as "may," "intend," "will,"
"expect," "anticipate," "estimate," or "continue" or the negative thereof or
other variations thereon or comparable terminology. This prospectus contains
forward-looking statements regarding, among other things, our plans, strategies
and prospects, both business and financial. Although we believe that our plans,
intentions and expectations reflected in or suggested by these forward-looking
statements are reasonable, we can give no assurance that we will achieve or
realize these plans, intentions or expectations. Forward-looking statements are
inherently subject to risks, uncertainties and assumptions. Important factors
that could cause actual results to differ materially from the forward-looking
statements we make in this prospectus are set forth under the caption "Risk
Factors" and elsewhere in this prospectus and include uncertainties associated
with the expansion of our gathering operations, project development schedules,
marketing plans, throughput capacity and anticipated volumes that involve a
number of risks and uncertainties, including the composition of gas to be
treated and the drilling schedules and success of the producers whose acreage
is dedicated to our facilities. In addition to the important factors referred
to in this prospectus, numerous other factors affecting the gas processing
industry generally and the markets for gas and natural gas liquids in which we
participate could cause actual results to differ materially. All forward-
looking statements attributable to us or persons acting on our behalf are
expressly qualified in their entirety by those cautionary statements. We will
not update these forward-looking statements even though our situation will
change in the future.

                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

   We incorporate herein by reference our Annual Report on Form 10-K for the
year ended December 31, 1998, as filed with the Securities Exchange Commission
(the "Commission") on March 29, 1999, our Quarterly Reports on Form 10-Q for
the quarters ended March 31, 1999 and June 30, 1999, as filed with the
Commission on May 13, 1999 and August 13, 1999, our Current Reports on Form 8-
K, dated May 10, 1999, May 25, 1999, May 27, 1999 and September 14, 1999, as
filed with the Commission on May 10, 1999, May 25, 1999, May 27, 1999 and
September 22, 1999, our Current Report on Form 8-K/A, dated July 7, 1999 as
filed with the Commission on July 7, 1999, and our Proxy Statement for Annual
Meeting of Stockholders as filed with the Commission on April 20, 1999.

   All documents filed by us pursuant to Section 13(a), 13(c), 14 or 15(d) of
the Securities Exchange Act of 1934, as amended (the "Exchange Act"),
subsequent to the date of this prospectus and prior to the termination of the
offering made hereby shall be deemed to be incorporated by reference herein and
to be a part hereof from the date of filing of such documents. Any statement
contained herein or in a document incorporated or deemed to be incorporated
herein by reference shall be deemed to be modified or superseded for purposes
of this prospectus to the extent that a statement contained herein or in any
subsequently filed document which also is, or is deemed to be, incorporated by
reference herein modifies or supersedes such statements. Any such statement so
modified or superseded shall not be deemed, except as so modified or
superseded, to constitute a part of the prospectus.

                                       i
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                             AVAILABLE INFORMATION

   We have filed with the Commission a registration statement on Form S-4 under
the Securities Act of 1933, covering the exchange notes (File No. 333-86881).
This prospectus does not contain all of the information included in the
registration statement. If we have filed any contract, agreement or other
document as an exhibit to the registration statement, you should read the
exhibit for more complete understanding of the document or matter involved.

   We are subject to the informational requirements of the Exchange Act and, in
accordance therewith, we file reports, proxy statements and other information
with the Commission. The reports, proxy statements and other information that
we file with the Commission pursuant to the informational requirements of the
Exchange Act may be inspected and copied at the public reference facilities
maintained by the Commission at Room 1024, 450 Fifth Street, N.W., Judiciary
Plaza, Washington, D.C. 20549, and at the following Regional Offices of the
Commission: Midwest Regional Office, Citicorp Center, Suite 1400, 14th Floor,
500 West Madison Street, Chicago, Illinois 60661; and Northeast Regional
Office, Suite 1300, 13th Floor, 7 World Trade Center, New York, New York 10048.
Copies of such material can be obtained at prescribed rates from the Public
Reference Section of the Commission at 450 Fifth Street, N.W., Judiciary Plaza,
Washington, D.C. 20549. The public may obtain information on the operation of
the Public Reference Room by calling the Commission at 1-800-SEC-0330. The
Commission also maintains a Web site (http:/ /www.sec.gov) that makes available
reports, proxy statements and other information regarding Western. Shares of
Western's common stock, $0.10 par value, are quoted on the New York Stock
Exchange ("NYSE") under the symbol "WGR," and copies of reports and other
information concerning Western can also be inspected at the offices of the
NYSE, 20 Broad Street, New York, New York 10005.

   In addition, pursuant to the indenture, we have agreed to the extent
permitted by the Commission to file with the Commission and in all events to
distribute to the trustee our annual reports containing audited annual
consolidated financial statements and our quarterly reports containing our
unaudited consolidated financial statements for each of the first three
quarters of each fiscal year. We will do this without regard to whether we are
subject to the informational requirements of the Exchange Act.

   This prospectus incorporates important business and financial information
about us that we have not included in or delivered with the prospectus. This
information is available without charge upon written or oral request. You
should make any request to Ron O. Wirth, Western Gas Resources, Inc., 12200
North Pecos Street, Denver, Colorado 80234-3439, telephone number: (303) 452-
5603.

                              CERTAIN DEFINITIONS

   As used in this prospectus:

  . ""Bcf'' means billion cubic feet;

  . ""Bcf/D" means billion cubic feet per day;

  . ""Btu'' means British thermal unit;

  . ""casinghead gas" means gas produced from an oil well;

  . ""FERC'' means the Federal Energy Regulatory Commission;

  . ""fractionation'' means the separation of a natural gas liquid stream
    into components such as ethane, propane, normal butane, iso-butane and
    natural gasoline;

  . ""MBbl'' means thousand barrels;

  . ""Mcf'' means thousand cubic feet;

  . ""MMcf'' means million cubic feet;

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  . ""MMcf/D" means million cubic feet per day;

  . ""MGal'' means thousand gallons;

  . ""MGal/D" means thousand gallons per day;

  . ""NGL'' means natural gas liquids;

  . ""peaking'' means providing incremental supply of gas to meet
    requirements for high volumetric demand on short notice;

  . ""Tcf'' means trillion cubic feet; and

  . ""throughput capacity" represents capacity at a facility in accordance
    with operational constraints or design specifications.

                                      iii
<PAGE>

                               PROSPECTUS SUMMARY

   The following summary contains basic information about Western Gas
Resources, Inc. and the exchange of notes. It may not contain all the
information that may be important to you. You should read this entire
prospectus, including the financial data and related notes, and the documents
to which we have referred you before making an investment decision. The terms
"Western," "we," "our" and "us," as used in this prospectus, refer to Western
Gas Resources, Inc. and its subsidiaries as a consolidated entity, except where
it is clear that these terms mean only Western Gas Resources, Inc. You should
carefully consider the information set forth under "Risk Factors." In addition,
certain statements include forward-looking information which involves risks and
uncertainties. See "Disclosure Regarding Forward-Looking Statements."

                                  The Company

   Western gathers, processes, treats, develops and produces, transports and
markets natural gas and NGLs. We operate in major gas-producing basins in the
Rocky Mountain, Mid-Continent, Gulf Coast and Southwestern regions of the
United States. We design, construct, own and operate natural gas gathering
systems and processing and treating facilities in order to provide our
customers with a broad range of services from the wellhead to the sales
delivery point.

   On a pro forma basis, after giving effect to the April 1999 sales of our
Katy gas storage and hub facility and our Giddings gas gathering system and the
June 1999 sale of our MiVida treating facility:

  . at June 30, 1999, we owned approximately $1.0 billion of assets,
    including approximately 8,000 miles of gathering systems, 21 processing
    and treating facilities and two regulated natural gas pipelines, and at
    December 31, 1998 we owned approximately 239 Bcf of net proven natural
    gas reserves;

  . for both the year ended December 31, 1998 and the six months ended June
    30, 1999, we had average throughput at our facilities of approximately
    1.1 Bcf/D of natural gas;

  . for the year ended December 31, 1998 and the six months ended June 30,
    1999, we generated revenues of $2.1 billion and $864.4 million,
    respectively, and earnings before interest expense, income taxes,
    depreciation, depletion and amortization, non-cash impairment charges and
    gains or losses on the sales of assets and any extraordinary charges, or
    EBITDA, of $66.7 million and $32.9 million, respectively.

   Our operations are conducted through the following four business segments:

  . Gathering and Processing--Our operations are in well-established basins
    such as the Permian, Anadarko, Powder River, Green River and San Juan
    basins. We connect oil and gas wells to our gathering systems for
    delivery of natural gas to our processing or treating plants. At our
    plants we process natural gas to extract NGLs and we treat natural gas in
    order to meet pipeline specifications. We provide these services to major
    oil and gas companies and to various sized independent producers.

  . Production--We develop and, in limited cases, explore for natural gas,
    primarily with third-party producers. We participate in exploration and
    production in order to enhance and support our existing gathering and
    processing operations. We sell the natural gas that we produce to third
    parties. Our producing properties are primarily located in the Powder
    River and Green River basins of Wyoming.

  . Marketing--We buy and sell natural gas and NGLs in the wholesale market
    in the United States and in Canada. We provide storage, transportation,
    scheduling, peaking and other services to our customers. Our customers
    for these services include utilities, local distribution companies,
    industrial end-users and other energy marketers.

  . Transportation--We transport natural gas through our regulated pipelines
    for producers and energy marketers under fee schedules regulated by state
    or federal agencies.


                                       1
<PAGE>


For the year ended December 31, 1998, each business segment's relative
contribution to our EBITDA before selling and administrative expenses was as
presented in the following chart:

                           [PIE CHART APPEARS HERE]

Gathering & Processing    70%
Production                12%
Marketing                 12%
Transportation             6%

   In order to reduce our overall debt level and provide us with additional
liquidity to fund our key growth opportunities, in 1998 we sold our Edgewood
processing plant and our interest in the production served by this facility and
our Perkins gas gathering and processing facility for an aggregate of $75.0
million, and in April 1999 we sold our Katy facility and a portion of the
associated natural gas inventory for gross proceeds of $111.7 million and our
Giddings facility for gross proceeds of $36.0 million. In June 1999, we sold
our MiVida treating facility for gross proceeds of $12.0 million. As a result
of these sales in 1999 and the offering of notes and the use of proceeds
therefrom (collectively, the "Transactions"), our total debt was $371.8 million
at June 30, 1999.

   Our principal offices are located at 12200 North Pecos Street, Denver,
Colorado 80234-3439, and our telephone number is (303) 452-5603. Western was
incorporated in Delaware in 1989. Our common stock is traded under the symbol
"WGR" on the New York Stock Exchange.

                               Business Strategy

   Our long-term business plan is to increase our profitability by: (i)
optimizing the profitability of existing operations; (ii) entering into
additional agreements with third-party producers who dedicate acreage to our
gathering and processing operations; and (iii) investing in projects or
acquiring assets that complement and extend our core natural gas gathering,
processing, production and marketing businesses.

   Capital expenditures related to existing operations are expected to be
approximately $67.0 million during 1999. This includes approximately $39.6
million related to gathering, processing and pipeline assets and approximately
$18.5 million for the development of gas reserves in the Powder River basin.

Optimize Profitability

   We continuously seek to improve the profitability of our existing operations
by:


  . increasing natural gas throughput levels through new well connections and
    expansion of gathering systems. In 1999, we expect to spend approximately
    $8.0 million on additional well connections and compression and gathering
    system expansions. We increased throughput levels at our facilities from
    895 MMcf/D in 1993 to 1,162 MMcf/D in 1998.

                                       2

<PAGE>


  . increasing our efficiency through the consolidation of existing gathering
    and processing facilities. Consolidations allow us to increase the
    throughput of the surviving plant while eliminating a majority of the
    operating costs of the closed plant. For example, in 1998 we combined the
    processing operations of our Four Corners and San Juan River plants.

  . evaluating assets. We routinely review the economic performance of each
    of our operating facilities to ensure that a targeted rate of return is
    achieved. If an operating facility is not generating targeted returns we
    explore various options, such as consolidation with other Western-owned
    or third-party-owned facilities, dismantlement, asset swap or outright
    sale.

  . controlling operating and overhead expenses. We recently restructured our
    operational and administrative organization which we expect will result
    in approximately $5.0 million in savings in plant operating and selling
    and administrative expenses in 1999 from those incurred in 1998.

Increase Dedicated Acreage

   Our operations are located in some of the most actively drilled oil and gas
producing basins in the United States. We enter into agreements under which we
gather and process natural gas produced on acreage dedicated to us by third
parties. We continually seek to obtain production from new wells and newly
dedicated acreage in order to replace declines in existing reserves that are
dedicated for gathering and processing at our facilities. We have increased our
dedicated estimated reserves from 2.2 Tcf at December 31, 1993 to 3.1 Tcf at
December 31, 1998. On average, over this five-year period, including the
reserves associated with our joint ventures and partnerships and excluding the
reserves associated with facilities sold during this period, we connected new
reserves to our facilities to replace approximately 165% of throughput over
this period. In order to obtain additional dedicated acreage and to secure
contracts on favorable terms, we may participate to a limited extent with
producers in exploration and production activities. For the same reason, we may
also offer to sell an ownership interest in our facilities to selected
producers.

Expansion of Core Business

   We will continue to invest in projects that complement and extend our core
natural gas gathering, processing, production and marketing businesses. We will
also expand our gathering, processing and production operations into new
geographic areas. During 1999, the majority of our capital budget will be spent
in the Powder River basin of Wyoming and in Southwest Wyoming. These projects
include:

  . continued development of Powder River basin coal bed methane reserves to
    increase natural gas production and throughput at our existing gathering
    and transportation facilities;

  . completion of the Fort Union gathering pipeline and treater, which will
    enable us and others to increase gas production in the Powder River basin
    and connect to major interstate pipelines for transportation; and

  . continued expansion of our gathering systems and participation in the
    drilling for additional natural gas reserves in Southwest Wyoming.

                             Competitive Strengths

Reputation and Experience

   We believe we are a well-known and respected provider of low cost, high
quality gathering, processing and treating and energy marketing services. Our
executive officers have an average of 20 years of experience in the energy
industry. This experience and our technical capabilities in the design and
construction of facilities allow us to respond rapidly to the needs of our
customers. As an example, our reputation has given us the opportunity to manage
the current construction of, and in the future operate, the Fort Union
gathering pipeline and treater. We believe our low cost operations will enable
us to continue to offer competitive terms to our customers.

                                       3
<PAGE>


Well-Positioned Asset Base

   We are positioned in some of the most actively drilled oil and gas producing
basins in the United States. Further, we seek to enhance our operations in
these basins through expansion of existing gathering systems and the
acquisition of complementary systems. As of June 30, 1999, our gathering
systems were located in seven states and consisted of more than 8,000 miles of
pipe with a throughput capacity of 2.3 Bcf/D. Our producing properties are
located primarily in the Powder River basin and in the Jonah Field of Southwest
Wyoming. We believe that our gathering, processing and producing assets are
primarily located in areas that will continue to be actively explored for both
oil and gas.

Diversity of Business Segments

   We believe the diversity of our operations helps to insulate us from the
full impact of commodity price fluctuations of NGLs. Our gathering and
processing gross margins are affected by relative natural gas and NGL price
changes. Our production gross margins are affected by natural gas price
changes. Our marketing and transportation gross margins are not negatively
affected by changing commodity prices. Due to our continued expansion of fee-
based services and the continued development of natural gas in the Powder River
basin, we expect that our gross margins in the future will be more dependent
upon the collection of fees and natural gas prices than upon NGL prices.

Favorable Long-Term Contracts

   Substantially all of the natural gas gathered or processed through our
facilities is supplied under long-term contracts with durations ranging from
five to 20 years. Approximately 90% of our gathering and processing gross
margins come from percentage-of-proceeds and fee-based contracts, which are our
preferred types of contracts.

  . Approximately 70% of our gathering and processing gross margins currently
    come from percentage-of-proceeds agreements. Under these agreements, we
    receive a percentage of the net proceeds from the sale of the gas and
    NGLs that we gather or process. As a result, our gross margins under
    these agreements vary directly with natural gas and NGL prices.

  . Approximately 20% of our gathering and processing gross margins currently
    come from fee-based contracts. Under these agreements, we receive a set
    fee per Mcf of the natural gas that we gather or process. This type of
    contract provides us with steady revenues that are not affected by
    changes in commodity prices except to the extent that low prices may
    cause a producer to curtail production. We expect the proportion of gross
    margins generated from fee-based contracts to increase significantly as
    Powder River and Southwest Wyoming gas volumes increase.

Significant Growth Opportunities

   Our presence in major producing basins provides us with what we believe are
significant growth opportunities within our existing areas of operation.
Currently, our two primary growth projects are as follows:

   Powder River Basin--We continue to develop our Powder River basin coal bed
methane natural gas gathering system and our coal seam gas reserves in Wyoming.
The average drilling, completion and gathering cost for our coal bed methane
wells is approximately $65,000 with proven reserves per well of approximately
320 MMcf. As deeper wells are drilled, the average cost per well is expected to
increase. Production of coal bed methane from the Powder River basin has been
expanding, and approximately 124 MMcf/D of gas volume in the second quarter of
1999 was being produced by several operators in the area as compared to 61
MMcf/D in January 1998. Approximately 75% of this production is from acreage
equally owned by our partner, Barrett Resources Corporation, and us. We
transport most of the coal bed methane gas through our MIGC interstate pipeline
located in Wyoming, for redelivery to gas markets in the Rocky Mountain and
Midwest regions of the United States.

                                       4
<PAGE>


   In December 1998, we joined with other industry partners to form Fort Union
Gas Gathering, L.L.C., which is currently constructing a 106-mile long, 24-inch
gathering pipeline and treater to gather and treat natural gas produced in the
Powder River basin. We own a 13% equity interest in Fort Union and are the
construction manager and field operator. We expect this new gathering pipeline
to have an initial capacity of approximately 450 MMcf/D of natural gas with
expansion capability. This project was operational in September 1999.

   Southwest Wyoming--The United States Geologic Survey estimates that the
Greater Green River basin contains over 120 Tcf of unrecovered natural gas
reserves. Our facilities are located in the Southwest Wyoming portion of this
basin. They include the Granger gathering and processing facility and a 72%
ownership interest in the Lincoln Road gathering and processing facility. These
facilities have a combined operational capacity of 225 MMcf/D and processed an
average of 177 MMcf/D in the first six months of 1999. We believe that as
governmental drilling restrictions affecting a portion of our service area in
this basin are removed in the fourth quarter of 1999, we may have the
opportunity to expand these facilities in the year 2000.

Risk Management Activities

   We believe that we are conservative in our approach to commodity price risk
management. Our commodity price risk management program has two primary
objectives. The first goal is to preserve and enhance the value of our equity
volumes of gas and NGLs with regard to the impact of commodity price movements
on EBITDA. The second goal is to manage price risk related to our gas, crude
oil and NGL marketing activities to protect profit margins.

   We hedged a portion of our equity volumes of gas and NGLs in 1999 at pricing
levels approximating our 1999 operating budget. Our equity hedging strategy
establishes a minimum and maximum price while allowing market participation
between these levels. As of June 30, 1999, we had hedged approximately 71% of
our anticipated equity gas for the remainder of 1999 at a weighted average
NYMEX equivalent minimum price of $2.00 per Mcf. Additionally, we have hedged
approximately 77% of our anticipated equity NGLs for the remainder of 1999 at a
weighted average composite Mont Belvieu and West Texas Intermediate crude oil
equivalent minimum price of $.23 per gallon.

                         Summary of the Exchange Offer

   On June 15, 1999, we completed the private offering of our 10% Senior
Subordinated Notes due 2009. Simultaneously with the private offering, we
entered into an exchange and registration rights agreement with the initial
purchasers of the private offering in which we agreed to deliver this
prospectus to you and to complete the exchange offer no later than 45 days
after the effective date of the registration statement of which this prospectus
is a part, which effective date must occur on or prior to December 12, 1999. If
we do not complete the exchange offer before this date, the annual interest
rate on the 10% Senior Subordinated Notes due 2009 will increase by .25% for
the first 90-day period during which the registration default continues, will
increase by .50% for the second 90-day period during which the registration
default continues, and will increase by .75% for the third 90-day period during
which the registration default continues and at a rate of 1.0% thereafter for
the period during which the registration default continues, up to a maximum
increase of 1.0% over the original interest rate of the notes until the
exchange offer is completed. You should read the discussion under the heading
"--Summary Description of the Notes" and "Description of the Notes" for more
information about the registered notes.

   We believe that the notes to be issued in the exchange offer may be resold
by you without compliance with the registration and prospectus delivery
provisions of the Securities Act, unless you are an affiliate of

                                       5
<PAGE>

Western or an underwriter or a broker dealer. You should read the discussion
under the heading "The Exchange Offer" for further information regarding the
exchange offer and resale of the notes.

Exchange and
 Registration Rights
 Agreement..............  This agreement entitles holders of old notes to
                          exchange their notes for registered notes with
                          identical economic terms. The exchange offer will
                          satisfy those rights. After the exchange offer is
                          complete, you will no longer be entitled to any
                          exchange or registration rights with respect to your
                          notes.

The Exchange Offer......  We are offering to exchange up to $155.0 million of
                          the exchange notes for up to $155.0 million of the
                          old notes. Old notes may be exchanged only in $1,000
                          increments.

Tenders; Expiration
 Date; Withdrawal.......  The exchange offer will expire at midnight, New York
                          City time, on November 18, 1999, unless we extend it.
                          If you decide to exchange your old notes for exchange
                          notes, you must acknowledge that you are not engaging
                          in, and do not intend to engage in, a distribution of
                          the exchange notes. You may withdraw your tender of
                          old notes at any time before midnight on November 18,
                          1999. If we decide for any reason not to accept your
                          notes for exchange, we will return them to you
                          promptly and without expense after the exchange offer
                          expires or terminates. See "The Exchange Offer--Terms
                          of the Exchange Offer" for a more complete
                          description of the tender and withdrawal provisions.

Conditions to the
 Exchange Offer.........  We are not required to accept any old notes in
                          exchange for exchange notes. We may terminate or
                          amend the exchange offer if we determine that the
                          exchange offer violates applicable law or any
                          applicable interpretation of the Commission.

Federal Tax
 Considerations.........  We believe the exchange of old notes for exchange
                          notes under the exchange offer will not result in any
                          gain or loss to you for federal income tax purposes.
                          See "Certain United States Federal Income Tax
                          Consequences" for a general summary of material
                          United States federal income tax consequences
                          associated with the exchange of the old notes for
                          exchange notes and the ownership and disposition of
                          those new notes.

Use of Proceeds.........  We will receive no proceeds from the exchange offer.

Exchange Agent..........  Chase Bank of Texas, National Association, is the
                          exchange agent for the exchange offer. The address
                          and telephone number of the exchange agent are set
                          forth under the heading "The Exchange Offer--The
                          Exchange Agent."

                 Consequences of Not Exchanging Your Old Notes

   If you do not exchange your old notes in the exchange offer, they will
continue to be subject to the restrictions on transfer that are described in
the legend on the notes. In general, you may offer or sell your old notes only
if they are registered under, or offered or sold under an exemption from the
Securities Act and applicable state securities laws.

                                       6
<PAGE>


   If old notes are tendered and accepted in the exchange offer, it may become
more difficult for you to sell or transfer your unexchanged notes. In addition,
if you do not exchange your old notes in the exchange offer, you will no longer
be entitled to have those notes registered under the Securities Act.

                   Consequences of Exchanging Your Old Notes

   Based on interpretations of the staff of the Commission, we believe that you
may offer for resale, resell or otherwise transfer the notes that we issue in
the exchange offer without complying with the registration and prospectus
delivery requirements of the Securities Act of 1933, as amended, if:

  . you acquire the exchange notes in the ordinary course of your business;

  . you are not participating, do not intend to participate, and have no
    arrangement or undertaking with anyone to participate, in the
    distribution of the notes issued to you in the exchange offer; and

  . you are not an "affiliate" of Western, as defined in Rule 405 of the
    Securities Act.

                        Summary Description of the Notes

   The terms of the exchange notes and the old notes are identical in all
material respects but two:

  . the transfer restrictions and registration rights relating to the old
    notes do not apply to the exchange notes; and

  . if we do not complete the exchange offer by a date which is no later than
    45 days after the effective date of the registration statement of which
    this prospectus is a part, which effective date must occur on or prior to
    December 12, 1999, the interest rate on the old notes will increase by
    .25% for the first 90-day period during which the registration default
    continues, will increase by .50% for the second 90-day period during
    which the registration default continues, and will increase by .75% for
    the third 90-day period during which the registration default continues
    and at a rate of 1.0% thereafter for the period during which the
    registration default continues, up to a maximum increase of 1.0% over the
    original interest rate of the old notes.

Issuer..................  Western Gas Resources, Inc.

Exchange Notes to be
 Issued.................  $155.0 million aggregate principal amount of 10%
                          Senior Subordinated notes due 2009 which have been
                          registered under the Securities Act.

Maturity................  June 15, 2009.

Interest................  Annual rate: 10%

Interest Payment Dates..  Payment frequency: every six months on June 15 and
                          December 15, commencing December 15, 1999.

Sinking Fund............  None.

Ranking.................  The exchange notes will rank junior to all of our
                          existing and future indebtedness, other than trade
                          payables (as to which the exchange notes are pari
                          passu) and any future indebtedness that expressly
                          provides that it is equal to or subordinated in right
                          of payment to the exchange notes. The exchange notes
                          will be junior in right of payment to our existing
                          and future indebtedness under our Revolving Credit
                          Facility and our existing indebtedness under our
                          Master Shelf agreement and our outstanding 1995
                          Senior notes (collectively, the "Senior Debt
                          Agreements"). The old notes and the exchange notes
                          will rank pari passu with each other.

                                       7
<PAGE>


                          At June 30, 1999 we had outstanding borrowings of
                          $216.8 million under our Senior Debt Agreements. See
                          "Description of Other Indebtedness."

Subsidiary Guarantees...  Our payment obligations under the exchange notes will
                          be unconditionally guaranteed on a senior
                          subordinated basis by certain of our existing and
                          future subsidiaries. Payments by a subsidiary
                          guarantor on its guarantee of the exchange notes will
                          be junior in right of payment to all of that
                          guarantor's existing and future indebtedness to the
                          same extent and in the same manner as the exchange
                          notes are subordinated to our senior indebtedness.
                          Payments by a subsidiary guarantor on its guarantee
                          of the old notes and the exchange notes will be pari
                          passu with each other. See "Description of Notes--
                          Subsidiary Guarantees."

Optional Redemption.....  We may redeem some or all of the exchange notes at
                          our option at any time on or after June 15, 2004 at
                          the redemption prices listed in "Description of
                          Notes--Optional Redemption."

                          In addition, on or before June 15, 2002, we may, at
                          our option, use the net proceeds from one or more
                          public equity offerings to redeem up to 35% of the
                          aggregate principal amount of the exchange notes
                          originally issued at the price listed in "Description
                          of Notes--Optional Redemption."

Mandatory Offer to
 Repurchase.............  If we experience specific kinds of changes of control
                          or certain types of asset sales, we must offer to
                          repurchase the exchange notes at the prices listed in
                          "Description of Notes--Repurchase at Option of
                          Holders--Change of Control" and "--Asset
                          Disposition."

Covenants of Indenture..  We will issue the exchange notes under the indenture
                          governing the exchange notes with Chase Bank of
                          Texas, National Association, as trustee. The
                          indenture will limit our ability and/or the ability
                          of certain of our subsidiaries to:

                             . incur more debt;

                             . pay dividends, redeem or repurchase our stock
                               or make other distributions;

                             . make certain investments;

                             . create certain liens;

                             . enter into transactions with affiliates;

                             . merge or consolidate or dispose of all or
                               substantially all of our assets;

                             . dispose of certain asset sale proceeds; and

                             . incur senior subordinated debt that does not
                               rank equal to the exchange notes.

                          These covenants are subject to a number of important
                          qualifications and limitations. See "Description of
                          Notes--Certain Covenants."

                                       8
<PAGE>


Form of Notes Issued in
 the Exchange Offer.....  The exchange notes with respect to notes currently
                          represented by global securities will be represented
                          by one or more permanent global securities in bearer
                          form deposited with Chase Bank of Texas, National
                          Association, as book-entry depositary, for the
                          benefit of The Depository Trust Company. Notes that
                          are issued in the exchange offer that have been
                          exchanged for notes in the form of registered
                          definitive certificates will be issued in the form of
                          registered definitive certificates until holders
                          direct otherwise. For more information, see
                          "Description of Notes--Book-Entry, Delivery and
                          Form."

                                       9
<PAGE>

               Summary Consolidated Financial and Operating Data

                 (Dollars in thousands, except operating data)

<TABLE>
<CAPTION>
                           Six Months Ended June 30,                    Year Ended December 31,
                          ------------------------------ --------------------------------------------------------
                                      Pro
                                     Forma                           Pro Forma
                            1999    1999(3)      1998       1998      1998(3)       1997       1996       1995
                          --------  --------  ---------- ----------  ----------  ---------- ---------- ----------
<S>                       <C>       <C>       <C>        <C>         <C>         <C>        <C>        <C>
Statement of Operations
 Data:
Revenues................  $863,945  $864,401  $1,081,226 $2,133,566  $2,063,824  $2,385,260 $2,091,009 $1,256,984
Operating profit(1).....    31,565    48,895      77,102    125,914     113,369     153,003    168,686    140,572
Interest expense........    15,753    13,682      16,296     33,616      29,475      27,474     34,437     37,160
Income (loss) before
 taxes..................   (24,895)   (4,008)     16,571   (105,623)   (106,311)      2,220     41,631     (8,266)
Provision (benefit) for
 income taxes...........    (9,062)   (1,544)      6,031    (38,418)    (38,666)        733     13,690     (2,158)
Income (loss) before
 extraordinary items....   (15,833)   (2,464)     10,540    (67,205)    (67,645)      1,487     27,941     (6,108)
Extraordinary charge for
 early extinguishment of
 debt...................    (1,107)   (1,107)        --         --          --          --         --         --
Net income (loss).......   (16,940)   (3,571)     10,540    (67,205)    (67,645)      1,487     27,941     (6,108)

Other Financial Data:
EBITDA, as adjusted(2)..    37,613    32,942      46,329     79,291      66,747     118,404    137,233    115,141
Depreciation, depletion
 and amortization.......    24,755    23,268      29,328     59,346      51,631      59,248     63,207     65,361
Loss on impairment of
 property and equipment.       --        --          --     108,447     108,447      34,615        --      17,642
Preferred dividends.....     5,220     5,220       5,220     10,439      10,439      10,439     10,439     15,431
Capital expenditures....    34,247       --       51,838    105,216         --      198,901     74,555     78,521

Credit Statistics:
EBITDA/Interest
 expense(2).............      2.39      2.41        2.84       2.36        2.26        4.31       3.99       3.10
EBITDA/Fixed charges(2).      2.10      2.08        2.48       2.03        1.91        3.34       4.76       2.60
Long-term
 debt/EBITDA(2).........      4.99      5.64        5.63       6.37         --         3.73       2.77       4.60

Operating Data:
Average gas sales
 (MMcf/D)...............     2,050       --        2,145      2,200         --        1,975      1,794      1,572
Average NGL sales
 (MGal/D)...............     2,905       --        4,640      4,730         --        4,585      3,744      2,890
Average gas volumes
 gathered (MMcf/D)......     1,166       --        1,163      1,162                   1,229      1,171      1,020
Facility capacity
 (MMcf/D)...............     2,282       --        2,269      2,237         --        2,302      1,940      1,907
Dedicated reserves
 (Tcf)..................       --        --          --         3.1         --          3.3        2.8        2.7
Average gas prices
 ($/Mcf)................      1.93       --         2.07       2.01         --         2.30       2.19       1.53
Average NGL prices
 ($/Gal)................       .27       --          .27        .26         --          .36        .41        .31

<CAPTION>
                                                                                                         As of
                                                                                                        June 30,
                                                                                                          1999
                                                                                                       ----------
<S>                       <C>       <C>       <C>        <C>         <C>         <C>        <C>        <C>
Balance Sheet Data:
Total assets.....................................................................................      $1,004,591
Long-term debt...................................................................................         371,833
Stockholders' equity.............................................................................         358,207
</TABLE>
- -------
(1) Operating profit is income before interest expense, selling and
    administrative expense, income taxes, depreciation, depletion and
    amortization, and $108,447, $34,615 and $17,642 of non-cash impairment
    losses related to certain oil and gas assets and plant facilities in the
    fourth quarter of 1998, 1997 and 1995, respectively, in connection with
    Statement of Financial Accounting Standards No. 121, "Accounting for the
    Impairment of Long-Lived Assets and for Long-Lived Assets to be Disposed
    of", and $1,107 for the six months ended June 30, 1999 of after-tax
    extraordinary loss on early extinguishment of debt. This data does not
    purport to reflect any measure of operations or cash flow.
(2) EBITDA, as presented, reflects income before interest expense, income
    taxes, depreciation, depletion and amortization and $108,447, $34,615 and
    $17,642 of non-cash impairment losses related to certain oil and gas assets
    and plant facilities in the fourth quarter of 1998, 1997 and 1995,
    respectively, in connection with SFAS No. 121 and gains or losses on sales
    of assets of $(22,000), $15,866, $16,495, $5,153, $2,042 and $(1,179) for
    the six months ended June 30, 1999 and 1998 and for each of the years ended
    December 31, 1998, 1997, 1996 and 1995, respectively. The six months ended
    June 30, 1999 and the pro forma calculations for the six months ended June
    30, 1999 also exclude $1,107 of after-tax extraordinary loss on early
    extinguishment of debt. This data does not purport to reflect any measure
    of operations or cash flow. EBITDA is not a measure determined pursuant to
    generally accepted accounting principles, or GAAP, nor is it an alternative
    to GAAP income. For purposes of calculating the Long-term debt/EBITDA
    Credit Statistic, the EBITDA for each of the six months ended June 30, 1999
    and 1998 have been multiplied by two to arrive at an annualized amount.
(3) The pro forma column reflects the sales of the Katy, Giddings and MiVida
    facilities for total gross proceeds of $159,700 and the issuance of the old
    notes and the application of the net proceeds therefrom as if the sales and
    issuance of the old notes had occurred on January 1, 1998 and January 1,
    1999 for the Pro Forma Consolidated Statement of Operations. See "Pro Forma
    Consolidated Financial Statements."

                                       10
<PAGE>

                                  RISK FACTORS

   You should consider carefully all the information set forth in this
prospectus, including the following risk factors and warnings, before deciding
whether to exchange your old notes for the exchange notes. Except for the first
risk factor described below, the risk factors generally apply to the old notes
as well as to the exchange notes. The risks described below are not the only
risks that could affect us or our notes.

You may have difficulty selling the notes which you do not exchange.

   It may be difficult for you to sell notes that are not exchanged in the
exchange offer. Those notes may not be offered or sold unless they are
registered or there are exemptions from the registration requirements under the
Securities Act and applicable state securities laws.

   If you do not tender your old notes or if we do not accept some of your old
notes, those notes will continue to be subject to the transfer and exchange
restrictions in:

  . the indenture,

  . the legend on the old notes, and

  . the Offering Circular relating to the old notes.

   The restrictions on transfer of your old notes arise because we issued the
old notes pursuant to an exemption from the registration requirements of the
Securities Act and applicable state securities laws. In general, you may only
offer or sell the old notes if they are registered under the Securities Act and
applicable state securities laws, or offered and sold pursuant to an exemption
from such requirements. We do not intend to register the old notes under the
Securities Act. To the extent old notes are tendered and accepted in the
exchange offer, the trading market, if any, for the old notes would be
adversely affected.

We have substantial debt and debt service requirements.

   We have substantial debt and debt service requirements. In addition, we pay
approximately $10.4 million in preferred stock dividends per year. As of June
30, 1999, our total debt outstanding was $371.8 million, $216.8 million of
which is senior to the exchange notes, and our earnings for the calculation of
the ratio of earnings to fixed charges for the six months ended June 30, 1999
and the year ended December 31, 1998 would have been deficits of $26.3 million
and $108.5 million, respectively. Accordingly, no ratio of earnings to fixed
charges is presented.

   Our substantial debt could have important consequences including:

  . our substantial degree of leverage could make it more difficult for us to
    satisfy our obligations under the exchange notes;

  . our ability to borrow additional amounts for working capital, capital
    expenditures and other purposes will be limited or such financing may not
    be available on terms favorable to us;

  . a substantial portion of our cash flows from operations will be used to
    pay our interest expense, pay our preferred stock dividends and repay our
    debt, which will reduce the funds that would otherwise be available to us
    for our operations and future business opportunities; and

  . our substantial degree of leverage may limit our flexibility to adjust to
    changing market conditions, reduce our ability to withstand competitive
    pressures and make us more vulnerable to a downturn in general economic
    conditions of our business.

   See "Description of Other Indebtedness" and "Description of Notes."


                                       11
<PAGE>

We and our subsidiaries may be able to incur substantial additional
indebtedness in the future.

   We and our subsidiaries may be able to incur substantial additional
indebtedness in the future. This could further exacerbate the risks described
above. The terms of the indenture do not fully prohibit us or our subsidiaries
from incurring other indebtedness. As of June 30, 1999, the Revolving Credit
Facility allowed additional borrowings of $218.5 million and all of those
borrowings would be senior to the exchange notes. If new debt is added to our
and our subsidiaries' current debt levels, the related risks that we and they
now face could intensify.

   See "Capitalization," "Consolidated Historical Financial and Operating
Data," "Description of Notes" and "Description of Other Indebtedness."

To service our debt, we will require a significant amount of cash and our
ability to generate cash depends on many factors.

   Our ability to repay or refinance our current debt, including the exchange
notes, depends on our successful financial and operating performance and on our
ability to successfully implement our business strategy. Unfortunately, we
cannot assure you that we will be successful in implementing our strategy or in
realizing our anticipated financial results. Our financial and operational
performance depends in part on prevailing economic conditions and on certain
financial, business and other factors beyond our control. We cannot assure you
that our cash flows and capital resources will be sufficient to pay our
interest expense, pay our preferred stock dividends and repay our debt. In the
event that we are unable to pay our obligations, we may be forced to: (i)
reduce or delay capital expenditures; (ii) delay implementation of our business
strategy; (iii) sell assets; (iv) obtain additional equity capital; or (v)
refinance or restructure all or a portion of our outstanding debt. However, our
ability to raise funds to service our debt and preferred stock obligations may
be restricted by the terms of our senior indebtedness, and the indenture and
our ability to effect equity financing will be dependent on our results of
operations and market conditions. In the event that we are unable to refinance
our indebtedness or raise funds through asset sales, sales of equity or
otherwise, our ability to pay principal of, and interest on, the exchange notes
could be adversely affected.

A breach in any of our restrictive debt covenants could result in a default
under debt agreements.

   The terms of our Senior Debt Agreements and the indenture governing the
exchange notes contain a number of significant covenants. These covenants will
limit our ability to, among other things:

  . incur more debt;

  . pay dividends, redeem or repurchase our stock or senior notes or make
    other distributions;

  . make certain investments;

  . use assets as security in other transactions;

  . enter into transactions with affiliates;

  . merge or issue certain securities or consolidate or dispose of our
    assets;

  . dispose of certain asset sale proceeds;

  . incur senior subordinated debt that does not rank equal to the exchange
    notes;

  . create certain liens;

  . extend credit;

  . sell or discount receivables;

  . enter into certain leases; and

  . enter into speculative derivative positions.


                                       12
<PAGE>

   A breach of any of these covenants could result in a default under our debt
agreements. A default, if not waived, could result in acceleration of our
indebtedness, in which case the debt would become immediately due and payable.
If this occurs, we may not be able to repay our debt or borrow sufficient funds
to refinance it. Even if new financing is available, it may not be on terms
that are acceptable to us.

   Certain of our subsidiaries guarantee our outstanding indebtedness under our
Senior Debt Agreements. These guarantees are secured by a lien on the capital
stock of certain of our subsidiaries, now owned or acquired later. In addition,
our Senior Debt Agreements contain covenants requiring us to maintain specified
financial ratios. Our ability to meet those financial ratios can be affected by
events beyond our control, and there can be no assurance that we will meet
those ratios. If we were unable to borrow under our Revolving Credit Facility
due to a default or if we fail to meet certain specified prerequisites for
borrowing, we could be left without sufficient liquidity and the senior lenders
could seize the stock securing these borrowings and/or enforce other remedies
at their disposal. The exchange notes will not be secured by any of our assets.

   See "Description of Notes--Certain Covenants" and "Description of Other
Indebtedness."

The old notes and the exchange notes rank behind all of our existing and future
indebtedness (other than trade payables) and any future indebtedness that
expressly provides that it is equal to or senior in right of payment to the old
notes and the exchange notes; payments by a guarantor on its guarantee of the
old notes and the exchange notes are similarly subordinated.

   The old notes and the exchange notes rank behind all of our existing and
future indebtedness, other than trade payables (as to which the old notes and
the exchange notes are pari passu) and any future indebtedness that expressly
provides that it is equal to or senior in right of payment to the old notes and
the exchange notes. Similarly, payments by a guarantor on its guarantee of the
old notes and the exchange notes are subordinated to the prior payment in full
of all Guarantor Senior Debt of that guarantor substantially to the same extent
as the old notes and the exchange notes are subordinated to all existing and
future Senior Debt of Western. As a result, upon any distribution to our
creditors in a bankruptcy, liquidation or reorganization, the holders of any
senior indebtedness, including the lenders under our Senior Debt Agreements,
will be entitled to be paid in full in cash before we will make any payments on
the old notes and the exchange notes; and upon any distribution to the
creditors of a guarantor in a bankruptcy, liquidation or dissolution relating
to that guarantor, the holders of Guarantor Senior Debt of that Guarantor will
be entitled to be paid in full before any payment may be made with respect to
its guarantee of the old notes and the exchange notes. In the event of our
bankruptcy, liquidation or dissolution, our assets would be available to pay
obligations on the old notes and the exchange notes only after all payments had
been made on our Senior Debt. We cannot assure you that sufficient assets will
remain to make any payments on the old notes and the exchange notes.

   In addition, all payments on the old notes and the exchange notes will be
blocked in the event of a payment default on our Senior Debt and may be blocked
for up to 179 of 360 consecutive days in the event of certain non-payment
defaults on Senior Debt.

   In the event of a bankruptcy, liquidation or dissolution relating to us or
the guarantors, holders of the old notes and the exchange notes will
participate on a pari passu basis with trade creditors and all other holders of
senior subordinated indebtedness of Western and the guarantors. However,
because the indenture requires that amounts otherwise payable to holders of the
old notes and the exchange notes in a bankruptcy or similar proceeding be paid
instead to holders of Senior Debt until they are paid in full, holders of the
old notes and the exchange notes will in all likelihood receive less, ratably,
than holders of trade payables and other senior subordinated debt in any such
proceeding. In addition, the acceleration of any of our indebtedness, the
aggregate principal amount of which equals or exceeds $10.0 million, will
constitute an event of default under the indenture. If an event of default
exists under the Senior Debt Agreements or certain other Senior Debt, the
indenture may restrict payments on the old notes and the exchange notes until
holders of such other indebtedness are paid in full or such default is cured or
waived or has otherwise ceased to exist. In any of these cases, we and the
guarantors may not have sufficient funds to pay all of our creditors and
holders of the old

                                       13
<PAGE>

notes and the exchange notes will in all likelihood receive less, ratably, than
the holders of trade payables and other senior subordinated debt.

   The outstanding Senior Debt of Western at June 30, 1999 was $216.8 million.
At that date, the only outstanding indebtedness of our subsidiaries was
intercompany indebtedness owed to Western and trade payables.

   In addition, at June 30, 1999 approximately $218.5 million was available for
borrowing as additional Senior Debt under the Revolving Credit Facility. We and
our subsidiaries will be permitted to borrow substantial additional
indebtedness, including Senior Debt, in the future under the terms of the
indenture.

   The old notes and the exchange notes are not secured by any of our assets.
Our obligations under the Senior Debt Agreements, however, are secured by a
pledge of the capital stock of our significant subsidiaries. All of the
indebtedness outstanding under the Senior Debt Agreements matures prior to the
maturity of the old notes and the exchange notes. If we were to become
insolvent or were liquidated, or if payments under the Senior Debt Agreements
were accelerated, the lenders under the Senior Debt Agreements will be entitled
to exercise the remedies available to a secured lender under applicable law.
Under these circumstances, the senior lenders would have a secured claim on the
stock of and distributions from our subsidiaries. See "Description of Other
Indebtedness" and "Description of Notes--Subordination."

We depend on dividends and other payments from our subsidiaries to satisfy our
financial obligations and make payments to investors.

   A significant portion of our properties are owned by, and a significant
portion of our operations are conducted through, our subsidiaries. As a result,
we depend on dividends and other payments from our subsidiaries to satisfy our
financial obligations and make payments to our investors. The ability of our
subsidiaries to pay dividends and make other payments to us is subject to
certain restrictions described elsewhere in this Risk Factor section. See "Risk
Factors--The old notes and the exchange notes rank behind all of our existing
and future indebtedness (other than trade payables) and any future indebtedness
that expressly provides that it is equal to or senior in right of payment to
the old notes and the exchange notes; payments by a guarantor on its guarantee
of the old notes and the exchange notes are similarly subordinated." and "--A
breach in any of our restrictive debt/covenants could result in a default under
debt agreements." In addition, the ability of a subsidiary to pay dividends to
us will be limited by applicable law. In the event of bankruptcy proceedings
affecting a subsidiary, to the extent we are recognized as a creditor of that
subsidiary, our claim would still be subordinate to any security interest in or
other lien on any assets of that subsidiary and to any of its debt and other
obligations that are senior to the payment of the old notes and the exchange
notes.

Not all subsidiaries are guarantors on the old notes and the exchange notes.

   Our existing subsidiaries, WGR Canada, Inc., Western Gas Resources--
California, Inc., Centre Court Travel, Inc., Rising Star Pipeline Corporation
and Setting Sun Pipeline Corporation are not guarantors of the old notes and
the exchange notes. Certain of our future subsidiaries, including any foreign
subsidiaries, may not be guarantors of the old notes and the exchange notes. In
addition, the subsidiary guarantees will be released and discharged upon the
payment of our senior indebtedness.

   Payments on the exchange notes are only required to be made by us and the
subsidiary guarantors. No payments are required to be made on the exchange
notes from assets of subsidiaries which do not guarantee the exchange notes
unless those assets are transferred, by dividend or otherwise, to us or a
subsidiary guarantor. As a result, the exchange notes and the subsidiary
guarantees are effectively subordinated to all existing and future debt and
other liabilities and preferred stock of our subsidiaries that do not guarantee
the exchange notes. In the event of any insolvency, liquidation or other
reorganization of any of our subsidiaries that do not guarantee the

                                       14
<PAGE>

exchange notes, creditors of the subsidiaries, including trade creditors and
holders of the subsidiaries' preferred stock, would be entitled to receive
payment in full from the assets of the subsidiaries before Western, as a
stockholder, would be entitled to receive any distribution therefrom.

   Our Non-guarantor Subsidiaries generated approximately $342,000 and $336,000
of EBITDA in the year ended December 31, 1998 and for the six months ended June
30, 1999, respectively.

Upon the occurrence of certain specific kinds of change of control events, we
will be required to offer to repurchase all outstanding notes.

   Upon the occurrence of certain specific kinds of change of control events,
we will be required to offer to repurchase all outstanding old and exchange
notes. However, it is possible that we will not have sufficient funds at the
time of any change of control to make the required purchase of the old and
exchange notes or that restrictions in our Senior Debt Agreements will not
allow such repurchase.

   In particular, a change of control may cause an acceleration of the
indebtedness outstanding under the Senior Debt Agreements and other senior
indebtedness which may be outstanding in which case such indebtedness would be
required to be repaid in full before redemption or repurchase of the old or the
exchange notes. See "Description of Notes--Repurchase at Option of Holders--
Change of Control" and "Description of Other Indebtedness."

Our future financial condition and results of operations are affected by
volatile product prices and hedging transactions.

   Our future financial condition and results of operations will depend
significantly upon the prices received for our natural gas and NGLs. Prices for
natural gas and NGLs are subject to fluctuations in response to changes in
supply, market uncertainty and a variety of additional factors that are beyond
our control. These factors include the level of domestic production, the
availability of imported oil and gas, actions taken by foreign oil and gas
producing nations, the availability of transportation systems with adequate
capacity, the availability of competitive fuels, fluctuating and seasonal
demand for oil, gas and NGLs, conservation and the extent of governmental
regulation of production and the overall economic environment. A substantial or
extended decline in gas and/or NGL prices would have a material adverse effect
on our financial condition, results of operations and access to capital.

   Our risk management policy is to enter into futures, swaps and option
contracts primarily to reduce risk and to lock in profit margins on our equity
gas, marketing and storage activities. Over-the-counter, or OTC, derivatives
with counterparties, also permit us to offer our gas customers alternate
pricing and delivery mechanisms meeting their specific needs. To ensure a known
price for future equity production and a fixed margin between gas injected into
storage and gas withdrawn from storage, we typically will sell a futures
contract and related basis swap and thereafter, either (i) make physical
delivery of our product to comply with such futures contract and settle our
basis swap or (ii) buy matching futures and basis position contracts to unwind
our position and sell our production to a customer in the cash market. We also
may contract to sell future production to a customer at a fixed price and then
purchase futures contracts to lock in a margin. We also may utilize these same
techniques to manage price risk for product purchased from marketing customers.
These contracts may expose us to the risk of instances where: (i) equity
volumes are less than expected; (ii) our customers fail to purchase or deliver
the contracted quantities of natural gas or NGLs; or (iii) our OTC
counterparties fail to perform. Furthermore, to the extent that we engage in
hedging activities, we may be prevented from realizing the benefits of price
increases above the levels of such hedges.

The uncertainties of gas supply may affect our ability to replace dedicated
reserves.

   We must continually connect new wells to our gathering systems in order to
maintain or increase throughput levels to offset natural declines in dedicated
volumes. Drilling activity in certain basins in which we

                                       15
<PAGE>

operate has continued to be significantly reduced from levels that existed in
prior years. The level of drilling will depend upon, among other factors, the
prices for gas and oil, the energy policy of the federal government and the
availability of foreign oil and gas, none of which is within our control. There
is no assurance that we will be successful in replacing the dedicated reserves
processed at our facilities.

Our estimates of oil and gas reserves are subject to numerous uncertainties.

   Our reserve estimates are subject to numerous uncertainties inherent in the
estimation of quantities of proved reserves and in the projection of future
rates of production and the timing of development expenditures. The accuracy of
these estimates is a function of the quality of available data and of
engineering and geological interpretation and judgment. Reserve estimates are
imprecise and should be expected to change as additional information becomes
available. Estimates of economically recoverable reserves and of future net
cash flows expected therefrom prepared by different engineers or by the same
engineers at different times may vary substantially. Results of subsequent
drilling, testing and production may cause either upward or downward revisions
of previous estimates. In addition, the estimates of future net revenues from
our proved reserves and the present value of those reserves are based upon
certain assumptions about production levels, prices and costs, which may not be
correct. Further, the volumes considered to be commercially recoverable
fluctuate with changes in prices and operating costs. The meaningfulness of
such estimates is highly dependent upon the accuracy of the assumptions upon
which they were based. Actual results may differ materially from the results
estimated. Our estimates of reserves dedicated to our gathering and processing
facilities are calculated by our reservoir engineering staff and are based on
publicly available data. These estimates may be less reliable than the reserve
estimates made for our own producing properties since the data available for
estimates of our own producing properties also includes our proprietary data.

Opportunities for expansion and availability of related financing are
uncertain.

   In order for us to expand our business through either the purchase or
construction of new gathering and processing facilities, we will be required to
identify expansion opportunities and to finance these activities, using cash
flow, equity or debt financing or a combination thereof. No assurance can be
given that appropriate opportunities for expansion at levels of profitability
which satisfy our targeted rates of return can be obtained or that financing on
terms acceptable to us can be obtained. Natural gas and NGL price volatility
make it difficult to estimate the value of acquisitions and to budget and
forecast the return on our projects. In addition, unusually volatile prices
often disrupt the market for gas and NGL properties, as buyers and sellers have
more difficulty agreeing on the purchase price of properties.

The natural gas gathering, processing, treating and marketing businesses are
highly competitive and there can be no assurance that we can compete
successfully with other companies in the industry.

   We compete with other companies in the gathering, processing, treating and
marketing businesses both for supplies of natural gas and for customers for our
natural gas and NGLs. Competition for natural gas supplies is primarily based
on efficiency, reliability, availability of transportation and ability to
obtain a satisfactory price for the producers' natural gas. Competition for
sales customers is primarily based upon reliability and price of deliverable
natural gas and NGLs. Our competitors for obtaining additional gas supplies,
for gathering and processing gas and for marketing gas and NGLs include
national and local gas gatherers, brokers, marketers and distributors of
various sizes, financial resources and experience. For marketing customers that
have the capability of using alternative fuels, such as oil and coal, we also
compete based primarily on price against companies capable of providing such
alternative fuels. We have experienced narrowing margins related to third-party
sales due to the increasing availability of pricing information in the natural
gas industry. Counterparties in our gas marketing transactions may require
additional security such as letters of credit that are not required of certain
of our competitors. If the additional security is required, our marketing
margins and volumes may be adversely impacted.

                                       16
<PAGE>

The construction and operation of our gathering lines, plants and other
facilities are subject to environmental laws and regulations that could affect
our financial position or results of operations.

   The construction and operation of our gathering lines, plants and other
facilities used for the gathering, transporting, processing, treating, storing
or producing of natural gas, oil or NGLs are subject to federal, state and
local environmental laws and regulations, including those that can impose
obligations to clean up hazardous substances at our facilities or well sites or
at facilities to which we send waste for disposal. In most instances, the
applicable regulatory requirements relate to water and air pollution control or
waste management. We believe that we are in substantial compliance with
applicable material environmental laws and regulations. Environmental
regulation can increase the cost of planning, designing, constructing and
operating our facilities or well sites.

   Under the Clean Air Act, as amended, individual states are required to adopt
regulations to implement the operating permit program. We do not believe that
compliance with the Clean Air Act will require any material capital
expenditures, although it will cause increased permitting costs in future years
and will increase certain operating costs, such as emissions fees, on an
ongoing basis. We do not believe that such cost increases will have a material
effect on our financial position or results of operations.

   We believe that it is reasonably likely that the trend in environmental
legislation and regulation will continue to be towards stricter standards. We
are unaware of future environmental standards that are reasonably likely to be
adopted that will have a material effect on our financial position or results
of operations, but cannot rule out that possibility.

Our business is subject to numerous other operational risks.

   Numerous risks affect drilling activities, including the risk of drilling
non-productive wells or dry holes. The cost of drilling, completing and
operating wells and of installing production facilities and pipelines is often
uncertain. Also, our drilling operations could diminish or cease because of any
of the following:

  . title problems;

  . weather conditions;

  . noncompliance with or changes in governmental requirements or
    regulations;

  . shortage or delays in the delivery or availability of equipment; and

  . failure to obtain permits from regulatory agencies, such as those issued
    by the Bureau of Land Management, for our operations in a timely manner.

Regulations may have a significant impact upon our overall operations.

   Many aspects of our natural gas and NGL gathering, processing, marketing and
transportation operations are subject to federal, state and local laws and
regulations which can have a significant impact upon our overall operations. As
a processor and marketer of natural gas and NGLs, we depend on the
transportation and storage services offered by various interstate and
intrastate pipeline companies for the delivery and sale of our own gas and NGL
supplies as well as those we process and/or market for others. Both the
performance of transportation and storage services by interstate and intrastate
pipelines and the rates charged for such services are subject to the
jurisdiction of the Federal Energy Regulatory Commission and state regulatory
agencies, respectively. An inability to obtain transportation and/or storage
services at competitive rates can hinder our processing and marketing
operations and/or affect our sales margins.

Insurance and operational risks may result in curtailment or suspension of
operations.

   We are subject to various hazards which are inherent in the industry in
which we operate such as explosions, product spills, leaks and fires, each of
which could cause personal injury and loss of life, severe damage to and
destruction of property and equipment, and pollution or other environmental
damage, and may

                                       17
<PAGE>

result in curtailment or suspension of operations at the affected facility. We
maintain physical damage, comprehensive general liability, workers'
compensation and business interruption insurance, which insurance is subject to
deductibles that we consider reasonable. We are not fully insured against all
risks in our business, however, we believe that the coverage we maintain is
adequate and consistent with other companies in the industry. Consistent with
insurance coverage typically available to the natural gas industry, our
insurance policies do not provide coverage for losses or liabilities relating
to pollution, except for sudden and accidental occurrences.

In future years, we may be required to expend capital in excess of our budget
to continue to grow or maintain our operations.

   Our operations are dependent upon the continued connection of new reserves
and the building of additional facilities. Largely as a result of low commodity
prices, primarily affecting NGL products, we have reduced our budget for
capital expenditures in 1999 from the levels expended in 1997 and 1998. Capital
expenditures related to existing operations are expected to be approximately
$67.0 million during 1999, consisting of the following: (i) approximately $39.6
million related to gathering, processing and pipeline assets, of which $6.3
million is for maintaining existing facilities; (ii) approximately $24.6
million related to exploration and production activities; and (iii)
approximately $2.8 million for miscellaneous items. As of June 30, 1999, we had
expended approximately $34.3 million of this budget. We believe that in future
years we may be required to expend capital in excess of our 1999 budget to
continue to grow or maintain our operations.

   We plan to finance anticipated ongoing expenses and capital requirements
with funds generated from the following sources:

  . cash provided by operating activities;

  . funds available under our Revolving Credit Facility after the application
    of proceeds from this notes offering;

  . capital available from the sale of additional debt and equity securities;
    and

  . proceeds from asset sales.

   We believe the funds provided by these sources will be sufficient to meet
our 1999 cash requirements. However, the uncertainties and risks associated
with future performance and revenues, as described elsewhere in this Risk
Factor section, will ultimately determine our liquidity and ability to meet our
anticipated capital requirements. See "Management's Discussion and Analysis of
Financial Condition and Results of Operations--Liquidity and Capital
Resources."

Failure in Year 2000 compliance could have a material adverse effect on our
financial position and results of operations.

   Certain existing computer programs and hardware and industrial control
equipment were designed and developed to use a two-digit field to indicate the
year in an applicable date field, which could result in the improper processing
of dates for years after 1999. This issue is commonly known as the "Year 2000"
issue. The Year 2000 issue is a broad business issue, which could affect
financial and business applications and our automated systems and
instrumentation, as well as those of third parties. We have made a
comprehensive review of our computer systems to identify the systems that could
be affected by the Year 2000 issue and are in the process of identifying and
making the appropriate modifications to these computer systems. We believe we
also may be at risk in that the systems of other companies on which we rely may
not be Year 2000 compliant. Any failure on our part or by third parties of
business importance or other entities, such as governmental agencies, to become
Year 2000 compliant on a timely basis could have a material adverse effect on
our financial position and results of operations. See "Management's Discussion
and Analysis of Financial Condition and Results of Operations--Liquidity and
Capital Resources" and "Year 2000."

Undercapitalized partners may have a detrimental effect on our business.

   As a part of our long-term strategy, we will continue to enter into joint
ventures with third-party producers and other processors. Due to the recent
decline in oil and gas prices, some of our joint venture partners and

                                       18
<PAGE>

producers are experiencing liquidity and cash flow problems. These problems may
lead to their attempting to delay or slow down the pace of drilling or project
development in order to conserve cash, to a point that may be detrimental to
our business. Some partners may be unwilling or unable to pay their share of
the costs of projects as they become due. In addition, partners in a joint
venture are jointly and severally liable for the obligations of a partnership
or joint venture. At worst, a partner may declare bankruptcy and refuse or be
unable to pay their share of the costs of a project. We may then be required to
pay this partner's share of the project costs. In most instances, we believe
that we are contractually protected from such an event through our ability to
take over the non-paying partner's share of the project and by applicable oil
and gas lien laws and bankruptcy laws. However, no assurances can be given that
we would be successful, through the exercise of our contractual and legal
remedies, in preventing the detrimental effect on our business caused by any
undercapitalized partners.

We are at times involved in various forms of litigation the outcome of which
may result in our incurring additional liabilities.

   During the normal course of our operations, we are at times involved in
various forms of litigation, including those discussed in "Business--Legal
Proceedings", the outcome of which may result in our incurring additional
liabilities. The amount of any liabilities incurred through any unfavorable
legal outcome may adversely affect our financial condition and our results of
operations including resulting in violation of financial covenants or defaults
under our senior debt agreements or defaults under the subordinated debt
indenture. While we believe that we have meritorious defenses to all existing
litigation, the results of litigation are uncertain. If we sought to appeal any
unfavorable judgement, the ultimate results of any litigation would remain
unknown until the end of such an appeal process which may take up to several
years.

A subsidiary's guarantee of the exchange notes may be subordinated or avoided
as a result of fraudulent conveyance.

   Certain of our subsidiaries will provide a subordinated guarantee of the
exchange notes. Various applicable fraudulent conveyance laws have been enacted
for the protection of creditors. A court may use those laws to subordinate or
avoid any guarantee of the exchange notes issued by any of our subsidiaries. It
is also possible that under certain circumstances a court could hold that the
direct obligations of a subsidiary guaranteeing the exchange notes are superior
to the obligations under that guarantee.

   A court could avoid or subordinate the guarantee of the exchange notes by
any of our subsidiaries in favor of that subsidiary's other debts or
liabilities if, among other things, the court determines either of the
following to be true at the time that subsidiary issued the guarantee:

  . that subsidiary incurred the guarantee with the intent to hinder, delay
    or defraud any of its present or future creditors or that such subsidiary
    contemplated insolvency with a design to favor one or more creditors to
    the total or partial exclusion of others; or

  . that subsidiary did not receive fair consideration or reasonably
    equivalent value for issuing the guarantee and, at the time it issued the
    guarantee, that subsidiary:

    . was insolvent or rendered insolvent by reason of the issuance of the
      guarantee,

    .was engaged or about to engage in a business or transaction for which
     the remaining assets of that subsidiary constituted unreasonably small
     capital, or

    . intended to incur, or believed that it would incur, debts beyond its
      ability to pay such debts as they matured.

   Among other things, a legal challenge of a subsidiary's guarantee of the
exchange notes on fraudulent conveyance grounds may focus on the benefits, if
any, realized by that subsidiary as a result of our issuance of the old notes.
To the extent a subsidiary's guarantee of the exchange notes is avoided as a
result of fraudulent conveyance or held unenforceable for any other reason, the
exchange note holders would cease to have any claim in respect of that
guarantee and would be creditors solely of Western Gas Resources, Inc. and any
other remaining guarantors.

                                       19
<PAGE>

                                USE OF PROCEEDS

   We will not receive any proceeds from the exchange offer. All outstanding
notes that are tendered in the exchange offer will be retired and cancelled.
Accordingly, the issuance of the notes in the exchange offer will not result in
any proceeds to us.

   We received net proceeds of approximately $150.0 million from the offering
of the old notes, after deducting initial purchasers' discounts and estimated
expenses of the offering. We applied a portion of the net proceeds to repay
$33.3 million of outstanding indebtedness under the Master Shelf agreement, on
which pre-tax make-whole payments of approximately $1.1 million were also paid.
Of the $33.3 million repaid, $8.3 million bore interest at 7.51% and was due to
mature on October 27, 2000, and the remaining $25.0 million bore interest at
6.77% and was due to mature on September 22, 2003. The remaining proceeds of
approximately $115.6 million were used to repay a portion of the outstanding
indebtedness under our Revolving Credit Facility. Funds available under the
Revolving Credit Facility will be used together with operating cash flow to
fund our future capital expenditure plans as well as for general corporate
purposes. The amounts outstanding under the Master Shelf agreement and the
Revolving Credit Facility at June 30, 1999 were $158.3 million and $31.5
million, respectively, and bore interest at weighted average rates of 8.1% per
annum and 6.5% per annum, respectively. The indebtedness outstanding under both
facilities was incurred for general corporate purposes. At June 30, 1999,
approximately $218.5 million was available for borrowing under the Revolving
Credit Facility.

                              ACCOUNTING TREATMENT

   The exchange notes will be recorded at the same carrying value as the old
notes as reflected in our accounting records on the date of exchange.
Accordingly, no gain or loss for accounting purposes will be recognized by us.
The expenses of the exchange offer and the unamortized expenses related to the
issuance of the old notes will be amortized over the term of the exchange
notes.

                                       20
<PAGE>

                                 CAPITALIZATION

   The following table sets forth our consolidated capitalization at June 30,
1999. See "Use of Proceeds." This table should be read in conjunction with the
Pro Forma Consolidated Financial Statements and the Consolidated Financial
Statements and notes thereto included elsewhere in this prospectus.

<TABLE>
<CAPTION>
                                                            As of June 30, 1999
                                                            -------------------
                                                              (in thousands)
<S>                                                         <C>
Long-term debt:
  Revolving Credit Facility................................      $ 31,500
  1995 Senior Notes........................................        27,000
  Master Shelf Agreement...................................       158,334
  Senior Subordinated Notes................................       155,000
                                                                 --------
      Total long-term debt.................................       371,834
                                                                 --------
Stockholders' equity:
  Preferred Stock: par value $.10; 10,000,000 shares
   authorized (1)..........................................
    $2.28 Cumulative Preferred Stock, 1,400,000 shares
     issued and outstanding................................           140
    $2.625 Cumulative Convertible Preferred Stock,
     2,760,000 shares issued and outstanding...............           276
  Common Stock, par value $.10; 100,000,000 shares
   authorized: 32,173,009 shares issued and outstanding
   (2).....................................................         3,217
Additional paid-in capital.................................       397,344
Retained (deficit) earnings................................       (42,447)
Accumulated other comprehensive income.....................         1,349
Treasury stock, at cost; 25,016 shares in treasury.........          (788)
Notes receivable from key employees secured by common
 stock.....................................................          (884)
                                                                 --------
      Total stockholders' equity...........................       358,207
                                                                 --------
Total capitalization.......................................      $730,040
                                                                 ========
</TABLE>
- --------
(1) See Note (1) of Notes to Consolidated Financial Statements for a
    description of the terms of Western's outstanding preferred stock.
(2) Does not include 1,400,211 shares of Common Stock issuable upon exercise of
    outstanding stock options.

                  PRO FORMA CONSOLIDATED FINANCIAL STATEMENTS

   The accompanying Pro Forma Consolidated Statements of Operations for the six
months ended June 30, 1999 and the year ended December 31, 1998 give effect to
the sales of the Katy, Giddings and MiVida facilities, the effects on interest
of the prepayment of certain senior indebtedness and the issuance of the $155.0
million aggregate principal amount of old notes. These transactions were
completed prior to June 30, 1999 and are included in the historical
Consolidated Balance Sheet as of that date. The Pro Forma Consolidated
Statements of Operations are based on the assumptions set forth in the notes to
such statements.

   The Pro Forma Consolidated Statements of Operations comprise historical
financial data which has been retroactively adjusted to reflect the effect of
the above transactions on our historical consolidated statements of operations.
The historical information assumes that the transactions for which pro forma
effects are shown were completed January 1, 1999 and 1998 for the Pro Forma
Consolidated Statements of Operations. Such pro forma information should be
read in conjunction with the related historical financial information and is
not indicative of the results which would actually have occurred had the
transactions been in effect on the dates or for the period indicated or which
may occur in the future.

                                       21
<PAGE>

                 PRO FORMA CONSOLIDATED STATEMENT OF OPERATIONS

                                  (Unaudited)
                     For the six months ended June 30, 1999
                             (Dollars in Thousands)

<TABLE>
<CAPTION>
                                                                                   Debt
                          Historical   Giddings        Katy         MiVida       Offering
                           Company   Adjustment(1) Adjustment(2) Adjustment(3) Adjustment(4) Pro Forma
                          ---------- ------------- ------------- ------------- ------------- ---------
<S>                       <C>        <C>           <C>           <C>           <C>           <C>
Revenues:
 Sale of gas............   $715,055    $ (8,994)     $    --        $(2,730)      $   --     $703,331
 Sale of natural gas
  liquids...............    139,854      (2,864)          --            (14)          --      136,976
 Processing,
  transportation and
  storage revenue ......     24,319      (1,064)       (5,274)         (604)          --       17,377
 Other, net.............    (15,283)      6,600        16,600        (1,200)          --        6,717
                           --------    --------      --------       -------       -------    --------
   Total revenues.......    863,945      (6,322)       11,326        (4,548)          --      864,401
Costs and Expenses:
 Product purchases......    795,178     (10,797)           69        (2,481)          --      781,969
 Plant operating
  expense...............     33,519      (1,117)       (2,051)         (540)          --       29,811
 Oil and gas
  exploration and
  production costs......      3,683         --             44           --            --        3,727
 Depreciation,
  depletion and
  amortization..........     24,755        (36)        (1,128)         (323)          --       23,268
 Selling and
  administrative
  expense...............     15,952         --            --            --            --       15,952
 Interest expense.......     15,753      (1,116)       (3,462)         (372)        2,879      13,682
                           --------    --------      --------       -------       -------    --------
   Total costs and
    expenses............    888,840     (13,066)       (6,528)       (3,716)        2,879     868,409
                           --------    --------      --------       -------       -------    --------
Income (loss) before
 income taxes...........    (24,895)      6,744        17,854          (832)       (2,879)     (4,008)
Provision (benefit) for
 income taxes...........     (9,062)      2,428         6,427          (300)       (1,037)     (1,544)
                           --------    --------      --------       -------       -------    --------
Net Income (loss) before
 extraordinary items....    (15,833)      4,316        11,427          (532)       (1,842)     (2,464)
                           --------    --------      --------       -------       -------    --------
Extraordinary charge for
 early extinguishment of
 debt...................     (1,107)        --            --            --            --       (1,107)
                           --------    --------      --------       -------       -------    --------
Net Income (loss).......    (16,940)      4,316        11,427          (532)       (1,842)     (3,571)
Preferred stock dividend
 requirements...........     (5,220)        --            --            --            --       (5,220)
                           --------    --------      --------       -------       -------    --------
Income (loss)
 attributable to common
 stock..................   $(22,160)   $  4,316      $ 11,427       $  (532)      $(1,842)   $ (8,791)
                           ========    ========      ========       =======       =======    ========
Earnings (loss) per
 share of common stock--
 basic and diluted(5)...   $   (.69)                                                         $   (.27)
                           ========                                                          ========
</TABLE>

                                       22
<PAGE>

                 PRO FORMA CONSOLIDATED STATEMENT OF OPERATIONS

                                  (Unaudited)
                      For the year ended December 31, 1998

<TABLE>
<CAPTION>
                                                                                    Debt
                          Historical    Giddings        Katy         MiVida       Offering
                           Company    Adjustment(1) Adjustment(2) Adjustment(3) Adjustment(4) Pro Forma
                          ----------  ------------- ------------- ------------- ------------- ----------
                                                       (Dollars in Thousands)
<S>                       <C>         <C>           <C>           <C>           <C>           <C>         <C>
Revenues:
 Sale of gas............  $1,611,521    $(38,859)     $    --        $(4,188)     $    --     $1,568,474
 Sale of natural gas
  liquids...............     449,696      (8,134)          --            (28)          --        441,534
 Processing,
  transportation and
  storage revenue.......      44,743        (193)      (15,980)       (2,360)          --         26,210
 Sale of electric
  power.................          20         --            --            --            --             20
 Other, net.............      27,586         --            --            --            --         27,586
                          ----------    --------      --------       -------      --------    ----------
   Total revenues.......   2,133,566     (47,186)      (15,980)       (6,576)          --      2,063,824

Costs and Expenses:
 Product purchases......   1,914,303     (40,540)         (426)       (3,664)          --      1,869,673
 Plant operating
  expense...............      85,353      (4,485)       (6,429)       (1,654)          --         72,785
 Oil and gas
  exploration and
  production costs......       7,996         --            --            --            --          7,996
 Depreciation,
  depletion and
  amortization .........      59,346      (3,330)       (3,620)         (765)          --         51,631
 Selling and
  administrative
  expense...............      30,128         --            --            --            --         30,128
 Interest expense.......      33,616      (2,232)       (6,924)         (744)        5,759        29,475
 Loss on the impairment
  of property and
  equipment.............     108,447         --            --            --            --        108,447
                          ----------    --------      --------       -------      --------    ----------
   Total costs and
    expenses............   2,239,189     (50,587)      (17,399)       (6,827)        5,759     2,170,135
                          ----------    --------      --------       -------      --------    ----------
Income (loss) before
 income taxes...........    (105,623)      3,401         1,419           251        (5,759)     (106,311)
Provision (benefit) for
 income taxes...........    (38,418)       1,224           511            90        (2,073)      (38,666)
                          ----------    --------      --------       -------      --------    ----------
Income (loss)...........     (67,205)      2,177           908           161        (3,686)      (67,645)
                          ----------    --------      --------       -------      --------    ----------
Preferred stock dividend
 requirements...........    (10,439)         --            --            --            --        (10,439)
                          ----------    --------      --------       -------      --------    ----------
Income (loss)
 attributable to common
 stock..................  $  (77,644)   $  2,177      $    908       $   161      $(3,686)    $  (78,084)
                          ==========    ========      ========       =======      ========    ==========
Earnings (loss) per
 share of common stock--
 basic and diluted(5)...  $   (2.42)                                                          $   (2.43)
                          ==========                                                          ==========
</TABLE>

                                       23
<PAGE>

            NOTES TO PRO FORMA CONSOLIDATED STATEMENTS OF OPERATIONS

                                  (Unaudited)

   (1) The actual results of operations achieved by the Giddings facility
during the year ended December 31, 1998 and the six months ended June 30, 1999
are reversed to reflect the sale of this asset as if the sale had occurred on
January 1, 1999 and 1998 for the statements of operations. The sale of the
Giddings facility for gross proceeds of $36.0 million resulted in a net after-
tax loss of approximately $3.7 million in the second quarter of 1999. This loss
is not reflected on the Pro Forma Consolidated Statement of Operations for the
year ended December 31, 1998 and is revised out of the historical results on
the Pro Forma Consolidated Statement of Operations for the six months ended
June 30, 1999 as it is not a continuing charge. The proceeds received from the
sale of this facility were used to reduce long-term debt and interest expense
at our weighted average interest rate on the Revolving Credit Facility of 6.2%
for the year ended December 31, 1998 and the six months ended June 30, 1999,
respectively.

   (2) The actual results of operations achieved by the Katy facility during
the year ended December 31, 1998 and the six months ended June 30, 1999 are
reversed to reflect the sale of this asset as if the sale had occurred on
January 1, 1999 and 1998 for the statements of operations. The sale of the Katy
facility for gross proceeds of $100.0 million resulted in a net after-tax loss
of approximately $10.9 million in the second quarter of 1999. This loss is not
reflected on the Pro Forma Consolidated Statement of Operations for the year
ended December 31, 1998 and is revised out of the historical results on the Pro
Forma Consolidated Statement of Operations for the six months ended June 30,
1999 as it is not a continuing charge. In conjunction with this sale, we sold
approximately 5.1 Bcf of stored gas in the Katy facility for approximately
$11.7 million, which approximated our cost of the inventory. The combined
proceeds received from the sale of this facility and the inventory were used to
reduce long-term debt and interest expense at our weighted average interest
rate on the Revolving Credit Facility of 6.2% for the year ended December 31,
1998 and the six months ended June 30, 1999, respectively.

   (3) The actual results of operations achieved by the MiVida facility during
the year ended December 31, 1998 and the six months ended June 30, 1999 are
reversed to reflect the sale of this asset as if the sale had occurred on
January 1, 1999 and 1998 for the statements of operations. The sale of the
MiVida facility for gross proceeds of $12.0 million resulted in a net after-tax
gain of approximately $680,000 in the second quarter of 1999. This gain is not
reflected on the Pro Forma Consolidated Statement of Operations for the year
ended December 31, 1998 and is revised out of the historical results on the Pro
Forma Consolidated Statement of Operations for the six months ended June 30,
1999 as it is not a continuing item. The proceeds received from the sale of
this facility were used to reduce long-term debt and interest expense at our
weighted average interest rate on the Revolving Credit Facility of 6.2% for the
year ended December 31, 1998 and the six months ended June 30, 1999,
respectively.

   (4) The estimated net proceeds of the sale of $155.0 million aggregate
principal amount of the old notes of $150.0 million were used in part to repay
$33.3 million of indebtedness under the Master Shelf agreement at an average
rate of 6.95%. The pro formas assume the sale of the notes had occurred on
January 1, 1999 and 1998 for the statements of operations and reflect interest
on the notes at the rate of 10% per annum. In connection with the prepayment of
this indebtedness, we incurred an extraordinary loss on the early
extinguishment of debt of approximately $1.8 million, or $1.1 million after-
tax. This loss is not reflected on the Pro Forma Consolidated Statement of
Operations for the year ended December 31, 1998 as it is not a continuing
charge. The remaining proceeds from the offering of old notes of approximately
$115.6 million was used to repay a portion of the outstanding indebtedness
under the Revolving Credit Facility at an average rate of 6.2%.

   (5) The calculation of earnings (loss) per share of common stock--basic and
diluted excludes the gains and losses on sales of Giddings, Katy and MiVida
facilities. The calculation for the year ended December 31, 1998 also excludes
the extraordinary loss on early extinguishment of debt. The weighted average
shares of common stock outstanding for the six months ended June 30, 1999 and
the year ended December 31, 1998 were 32,147,993 and 32,147,354, respectively.

                                       24
<PAGE>

              CONSOLIDATED HISTORICAL FINANCIAL AND OPERATING DATA

   The following table sets forth selected consolidated historical financial
and operating data for Western. Certain prior year amounts have been
reclassified to conform to the presentation used in 1999. The data for the six
months ended June 30, 1999 and 1998 and the years ended December 31, 1998, 1997
and 1996 should be read in conjunction with our Consolidated Financial
Statements and the notes thereto included elsewhere in this prospectus. The
quarterly information is derived from unaudited financial information and is
subject to normal, recurring adjustments. The results for the first half of
1999 are not indicative of results to be expected for the full year. The
selected consolidated financial data for the years ended December 31, 1995 and
1994 is derived from our audited historical Consolidated Financial Statements.
See also "Management's Discussion and Analysis of Financial Condition and
Results of Operations."

<TABLE>
<CAPTION>
                            Six Months Ended
                                June 30,                           Year Ended December 31,
                          ------------------------- -----------------------------------------------------------------
                             1999           1998       1998           1997          1996       1995           1994
                          ----------     ---------- ----------     ----------    ---------- ----------     ----------
                                         (Dollars in thousands, except operating data)
<S>                       <C>            <C>        <C>            <C>           <C>        <C>            <C>
Statement of Operations:
Revenues................  $  863,945     $1,081,226 $2,133,566     $2,385,260    $2,091,009 $1,256,984     $1,063,489
Gross profit(a).........       6,810         47,774     66,568         93,755       105,479     75,211         72,556
Income (loss) before
 income taxes...........     (24,895)        16,571   (105,623)         2,220        41,631     (8,266)        11,524
Provision (benefit) for
 income taxes...........      (9,062)         6,031    (38,418)           733        13,690     (2,158)         4,160
Income (loss) before
 extraordinary items....     (15,833)        10,540    (67,205)(b)      1,487(b)     27,941     (6,108)(c)      7,364
Extraordinary charge for
 early extinguishment of
 debt...................      (1,107)(d)        --         --             --            --         --             --
Net income (loss).......     (16,940)        10,540    (67,205)(b)      1,487(b)     27,941     (6,108)(c)      7,364
Other Financial Data:
EBITDA, as adjusted(e)..      37,613         46,329     79,291        118,404       137,233    115,141        107,026
Capital expenditures....      34,247         51,838    105,216        198,901        74,555     78,521        100,540
Balance Sheet Data (at
 year end):
Total assets............   1,004,591      1,339,852  1,219,377      1,348,276     1,361,631  1,193,997      1,167,362
Long-term debt..........     371,833        521,914    504,881        441,357       379,500    529,500        493,000
Stockholders' equity....     358,207        470,441    385,216        468,112       480,467    371,909        436,683
Dividends on preferred
 stock..................  $    5,220     $    5,220 $   10,439     $   10,439    $   10,439 $   15,431     $   12,212
Operating Data:
Average gas sales
 (MMcf/D)...............       2,050          2,145      2,200          1,975         1,794      1,572          1,097
Average NGL sales
 (MGal/D)...............       2,905          4,640      4,730          4,585         3,744      2,890          2,970
Average gas volumes
 gathered (MMcf/D)......       1,166          1,163      1,162          1,229         1,171      1,020            934
Throughput capacity
 (MMcf/D)...............       2,282          2,269      2,237          2,302         1,940      1,907          1,560
Average gas prices
 ($/Mcf)................  $     1.93     $     2.07 $     2.01     $     2.30    $     2.19 $     1.53     $     1.77
Average NGL prices
 ($/Gal)................  $      .27     $      .27 $      .26     $      .36    $      .41 $      .31     $      .28
</TABLE>
- --------
(a) Excludes selling and administrative, interest, restructuring and income tax
    expenses, expenses for the impairment of property and equipment and any
    extraordinary items. See further discussion in notes (b), (c) and (d).
(b) Statement of Financial Accounting Standards No. 121, "Accounting for the
    Impairment of Long-Lived Assets and for Long-Lived Assets to be Disposed
    of," or SFAS No. 121, requires that an impairment loss be recognized when
    the carrying amount of an asset exceeds the fair market value of or the
    expected future undiscounted net cash flows. In accordance with SFAS No.
    121, we recognized a pre-tax, non-cash loss on the impairment of property
    and equipment of $108.5 million, or $69.0 million after-tax, and $34.6
    million, or $22.0 million after-tax, for the years ended December 31, 1998
    and 1997, respectively.
(c) In accordance with SFAS No. 121, we recognized a pre-tax, non-cash loss for
    the year ended December 31, 1995 on the impairment of property and
    equipment of $17.6 million, or $12.4 million after-tax. Also, we
    implemented a cost reduction program to reduce operating and selling and
    administrative expenses. As a result of this program, a $2.1 million pre-
    tax, or $1.3 million after-tax, restructuring charge was incurred,
    primarily related to employee severance costs.
(d) We recognized an extraordinary loss on the early extinguishment of long-
    term debt in the second quarter of 1999 of $1.8 million pre-tax, or $1.1
    million after-tax, primarily related to the prepayment of indebtedness with
    the proceeds of the subordinated debt offering.
(e) Reflects income before interest expense, income taxes, depreciation,
    depletion and amortization, $108,447, $34,615 and $17,642 of non-cash
    impairment losses related to certain oil and gas assets and plant
    facilities in the fourth quarter of 1998, 1997 and 1995, respectively, in
    connection with SFAS No. 121, gains or losses on sales of assets of
    $(22,000), $15,866, $16,495, $5,153, $2,042, $(1,179) for the six months
    ended June 30, 1999 and 1998 and for each of the years ended December 31,
    1998, 1997, 1996, 1995, respectively and a $1,107 after-tax charge for loss
    on the early extinguishment of long-term debt in the second quarter of
    1999. This data does not purport to reflect any measure of operations or
    cash flow. EBITDA is not a measure determined pursuant to generally
    accepted accounting principles, or GAAP, nor is it an alternative to GAAP
    income.

                                       25
<PAGE>

                               THE EXCHANGE OFFER

Purpose of the Exchange Offer

   When we sold the old notes on June 15, 1999, we entered into an exchange and
registration rights agreement with the initial purchasers of those notes. Under
the exchange and registration rights agreement, we agreed to file a
registration statement regarding the exchange of the old notes for notes which
are registered under the Securities Act of 1933. We also agreed to use our
reasonable best efforts to cause the registration statement to become effective
with the Commission, and to conduct this exchange offer after the registration
statement is declared effective. We will use our reasonable best efforts to
keep this registration statement effective at least until the exchange offer is
completed. The exchange and registration rights agreement provides that we will
be required to pay liquidated damages to the holders of the old notes if:

  (1) the registration statement is not filed by September 13, 1999;

  (2) the registration statement is not declared effective by December 12,
      1999; or

  (3) the exchange offer has not been completed by the 45th day after the
      registration statement is declared effective.

   A copy of the exchange and registration rights agreement is filed as an
exhibit to the registration statement of which this prospectus is a part.

Terms of the Exchange Offer

   This prospectus and the accompanying letter of transmittal together
constitute the exchange offer. Upon the terms and subject to the conditions set
forth in this prospectus and in the letter of transmittal, we will accept for
exchange old notes which are properly tendered on or before the expiration date
and are not withdrawn as permitted below. The expiration date for this exchange
offer is midnight, New York City time, on November 18, 1999, or such later date
and time to which we, in our sole discretion, extend the exchange offer.

   The form and terms of the exchange notes are the same as the form and terms
of the old notes, except that:

  (1) the exchange notes will have been registered under the Securities Act;

  (2) the exchange notes will not bear the restrictive legends restricting
      their transfer under the Securities Act; and

  (3) the exchange notes will not contain the registration rights and
      liquidated damages provisions contained in the old notes.

   Notes tendered in the exchange offer must be in denominations of the
principal amount of $1,000 and any integral multiple thereof.

   We expressly reserve the right, in our sole discretion:

  (1) to extend the expiration date;

  (2) to delay accepting any old notes;

  (3) if any of the conditions set forth below under "Conditions to the
      Exchange Offer" have not been satisfied, to terminate the exchange
      offer and not accept any notes for exchange; or

  (4) to amend the exchange offer in any manner.

   We will give oral or written notice of any extension, delay, non-acceptance,
termination or amendment as promptly as practicable by a public announcement,
and in the case of an extension, no later than 9:00 a.m., New York City time,
on the business day after the previously scheduled expiration date.


                                       26
<PAGE>

   During an extension, all old notes previously tendered will remain subject
to the exchange offer and may be accepted for exchange by us. Any old notes not
accepted for exchange for any reason will be returned without cost to the
holder that tendered them as promptly as practicable after the expiration or
termination of the exchange offer.

How to Tender Old Notes for Exchange

   When the holder of old notes tenders, and we accept, notes for exchange, a
binding agreement between us and the tendering holder is created, subject to
the terms and conditions set forth in this prospectus and the accompanying
letter of transmittal. Except as set forth below, a holder of old notes who
wishes to tender notes for exchange must do so on or prior to the expiration
date. Additionally a holder must:

  (1) transmit a properly completed and duly executed letter of transmittal,
      including all other documents required by such letter of transmittal,
      to the Chase Bank of Texas, National Association, the "exchange agent,"
      at the address set forth below under the heading "The Exchange Agent;"
      or

  (2) if old notes are tendered pursuant to the book-entry procedures set
      forth below, the tendering holder must transmit an agent's message to
      the exchange agent at the address set forth below under the heading
      "The Exchange Agent."

In addition either:

  (1) the exchange agent must receive the certificates for the old notes and
      the letter of transmittal;

  (2) the exchange agent must receive, prior to the expiration date, a timely
      confirmation of the book-entry transfer of the old notes being tendered
      into the exchange agent's account at the Depository Trust Company, or
      DTC, along with the letter of transmittal or an agent's message; or

  (3) the holder must comply with the guaranteed delivery procedures
      described below.

   The term "agent's message" means a message, transmitted to DTC and received
by the exchange agent and forming a part of a book-entry transfer, which states
that DTC has received an express acknowledgment that the tendering holder
agrees to be bound by the letter of transmittal and that we may enforce the
letter of transmittal against such holder.

   The method of delivery of the old notes, the letters of transmittal and all
other required documents is at the election and risk of the holders. If such
delivery is by mail, we recommend registered mail, properly insured, with
return receipt requested. In all cases, you should allow sufficient time to
assure timely delivery. No letters of transmittal or notes should be sent
directly to us.

   Any beneficial owner whose old notes are registered in the name of a broker,
dealer, commercial bank, trust company or other nominee, and who wishes to
tender, should contact the registered holder promptly and instruct such
registered holder to tender on such beneficial owner's behalf. If such
beneficial owner wishes to tender on such owner's own behalf, such owner must,
prior to completing and executing the letter of transmittal and delivering such
owner's old notes, either (1) make appropriate arrangements to register
ownership of the old notes in such owner's name or (2) obtain a properly
completed bond power from the registered holder. The transfer of registered
ownership may take considerable time.

   Signatures on a letter of transmittal or a notice of withdrawal, as the case
may be, must be guaranteed unless the old notes surrendered for exchange are
tendered:

  (1) by a holder of old notes who has not completed the box entitled
      "Special Issuance Instructions" or "Special Delivery Instructions" on
      the letter of transmittal; or

  (2) for the account of an eligible institution.


                                       27
<PAGE>

   An "eligible institution" is a firm which is a member of a registered
national securities exchange or a member of the National Association of
Securities Dealers, Inc., or a commercial bank or trust company having an
office or correspondent in the United States.

   If signatures on a letter of transmittal or notice of withdrawal are
required to be guaranteed, the guarantor must be an eligible institution. If
old notes are registered in the name of a person other than the signer of the
letter of transmittal, the old notes surrendered for exchange must be endorsed
by, or accompanied by a written instrument or instruments of transfer or
exchange, in satisfactory form as determined by us in our sole discretion, duly
executed by the registered holder with the holder's signature guaranteed by an
eligible institution.

   We will determine all questions as to the validity, form, eligibility and
acceptance of old notes tendered for exchange in our sole discretion, including
questions as to time of receipt. Our determination will be final and binding.
We reserve the absolute right to:

  (1) reject any and all tenders of any old note improperly tendered;

  (2) refuse to accept any old note if, in our judgment or the judgment of
      our counsel, acceptance of the old note may be deemed unlawful; and

  (3) waive any defects or irregularities or conditions of the exchange offer
      as to any particular old note either before or after the expiration
      date, including the right to waive the ineligibility of any holder who
      seeks to tender old notes in the exchange offer.

   Our interpretation of the terms and conditions of the exchange offer as to
any particular old notes either before or after the expiration date, including
the letter of transmittal and the instructions to it, will be final and binding
on all parties. Holders must cure any defects and irregularities in connection
with tenders of old notes for exchange within such reasonable period of time as
we will determine, unless we waive such defects or irregularities. Neither we,
the exchange agent nor any other person shall be under any duty to give
notification of any defect or irregularity with respect to any tender of old
notes for exchange, nor shall any of us incur any liability for failure to give
such notification.

   If a person or persons other than the registered holder or holders of the
old notes tendered for exchange signs the letter of transmittal, the tendered
old notes must be endorsed or accompanied by appropriate powers of attorney, in
either case signed exactly as the name or names of the registered holder or
holders that appear on the old notes.

   If trustees, executors, administrators, guardians, attorneys-in-fact,
officers of corporations or others acting in a fiduciary or representative
capacity sign the letter of transmittal or any old notes or any power of
attorney, such persons should so indicate when signing, and you must submit
proper evidence satisfactory to us of such person's authority to so act unless
we waive this requirement.

   By tendering, each holder will represent to us that, among other things,
that the person acquiring notes in the exchange offer is obtaining them in the
ordinary course of its business, whether or not such person is the holder, and
that neither the holder nor such other person has any arrangement or
understanding with any person to participate in the distribution of the
exchange notes. In the case of a holder that is not a broker-dealer, each such
holder, by tendering, will also represent to us that such holder is not engaged
in and does not intend to engage in a distribution of the exchange notes. If
any holder or any such other person is an "affiliate," as defined under Rule
405 of the Securities Act, of Western, or is engaged in or intends to engage in
or has an arrangement or understanding with any person to participate in a
distribution of such notes to be acquired in the exchange offer, such holder or
any such other person:

  (1) may not rely on the applicable interpretations of the staff of the SEC;
      and

  (2) must comply with the registration and prospectus delivery requirements
      of the Securities Act in connection with any resale transaction.

                                       28
<PAGE>

   Each broker-dealer who acquired its old notes as a result of market-making
activities or other trading activities and thereafter receives notes issued for
its own account in the exchange offer, must acknowledge that it will deliver a
prospectus that meets the requirements of the Securities Act in connection with
any resale of such exchange notes. The letter of transmittal states that by so
acknowledging and by delivering a prospectus, a broker-dealer will not be
deemed to admit that it is an "underwriter" within the meaning of the
Securities Act. See "Plan of Distribution" for a discussion of the exchange and
resale obligations of broker-dealers in connection with the exchange offer.

Acceptance of Old Notes for Exchange; Delivery of the Exchange Notes

   Upon satisfaction or waiver of all of the conditions to the exchange offer,
we will accept, promptly after the expiration date, all old notes properly
tendered and will issue notes registered under the Securities Act. For purposes
of the exchange offer, we shall be deemed to have accepted properly tendered
old notes for exchange when, as and if we have given oral or written notice to
the exchange agent, with written confirmation of any oral notice to be given
promptly thereafter. See "Conditions to the Exchange Offer" for a discussion of
the conditions that must be satisfied before we accept any old notes for
exchange.

   For each old note accepted for exchange, the holder will receive a note
registered under the Securities Act having a principal amount equal to that of
the surrendered old note. Accordingly, registered holders of exchange notes on
the relevant record date for the first interest payment date following the
consummation of the exchange offer will receive interest accruing from the most
recent date to which interest has been paid or, if no interest has been paid on
the old notes, from June 15, 1999. Old notes that we accept for exchange will
cease to accrue interest from and after the date of consummation of the
exchange offer. Under the exchange and registration rights agreement, we may be
required to make additional payments in the form of liquidated damages to
holders of the old notes under circumstances relating to the timing of the
exchange offer. Holders of old notes whose old notes are accepted for exchange
will not receive any payment in respect of accrued interest on such old notes
otherwise payable on any interest payment date the record date for which occurs
on or after consummation of the exchange offer.

   In all cases, we will issue notes in the exchange offer for old notes that
are accepted for exchange only after the exchange agent timely receives:

  (1) certificates for such old notes or a timely book-entry confirmation of
      such old notes into the exchange agent's account at DTC;

  (2) a properly completed and duly executed letter of transmittal or an
      agent's message; and

  (3) all other required documents.

   If for any reason set forth in the terms and conditions of the exchange
offer we do not accept any tendered old notes, or if a holder submits old notes
for a greater principal amount than the holder desires to exchange, we will
return such unaccepted or non-exchanged old notes without cost to the tendering
holder. In the case of the old notes tendered by book-entry transfer into the
exchange agent's account at DTC, such non-exchanged old notes will be credited
to an account maintained with DTC. We will return the old notes or have them
credited to DTC account as promptly as practicable after the expiration or
termination of the exchange offer.

Book Entry Transfers

   The exchange agent will make a request to establish an account with respect
to the old notes at the DTC for purposes of the exchange offer within 2
business days after the date of this prospectus. Any financial institution that
is a participant in DTC's systems must make book-entry delivery of old notes by
causing the DTC to transfer such old notes into the exchange agent's account at
DTC in accordance with DTC's procedures for transfer. Such participant should
transmit its acceptance to DTC on or prior to the expiration date or comply
with the guaranteed delivery procedures described below. DTC will verify such
acceptance, execute a book-entry transfer of the tendered old notes into the
exchange agent's account at DTC and then send

                                       29
<PAGE>

to the exchange agent confirmation of such book-entry transfer. The
confirmation of such book-entry transfer will include an agent's message
confirming that DTC has received an express acknowledgment from such
participant that such participant has received and agrees to be bound by the
letter of transmittal and that we may enforce the letter of transmittal against
such participant. Delivery of exchange notes may be effected through book-entry
transfer at DTC. However, the letter of transmittal or facsimile thereof or an
agent's message, with any required signature guarantees and any other required
documents, must:

  (1) be transmitted to and received by the exchange agent at the address set
      forth below under " The Exchange Agent" on or prior to the expiration
      date; or

  (2) comply with the guaranteed delivery procedures described below.

Guaranteed Delivery Procedures

   If a holder of old notes desires to tender such notes and the holder's old
notes are not immediately available, or time will not permit such holder's old
notes or other required documents to reach the exchange agent before the
expiration date, or the procedure for book-entry transfer cannot be completed
on a timely basis, a tender may be effected if:

  (1) the holder tenders the old notes through an eligible institution;

  (2) prior to the expiration date, the exchange agent receives from such
      eligible institution a properly completed and duly executed notice of
      guaranteed delivery, substantially in the form we have provided, by
      telegram, telex, facsimile transmission, mail or hand delivery, setting
      forth the name and address of the holder of the old notes being
      tendered and the amount of the old notes being tendered. The notice of
      guaranteed delivery shall state that the tender is being made and
      guarantee that within three New York Stock Exchange trading days after
      the date of execution of the notice of guaranteed delivery, the
      certificates for all physically tendered old notes, in proper form for
      transfer, or a book-entry confirmation, as the case may be, together
      with a properly completed and duly executed letter of transmittal or
      agent's message with any required signature guarantees and any other
      documents required by the letter of transmittal will be deposited by
      the eligible institution with the Exchange Agent; and

  (3) the exchange agent receives the certificates for all physically
      tendered old notes, in proper form for transfer, or a book-entry
      confirmation, as the case may be, together with a properly completed
      and duly executed letter of transmittal or agent's message with any
      required signature guarantees and any other documents required by the
      letter of transmittal, within three New York Stock Exchange trading
      days after the date of execution of the notice of guaranteed delivery.

Withdrawal Rights

   You may withdraw tenders of your old notes at any time prior to midnight,
New York City time, on the expiration date.

   For a withdrawal to be effective, you must send a written notice of
withdrawal to the exchange agent at one of the addresses set forth below under
" The Exchange Agent." Any such notice of withdrawal must:

  (1) specify the name of the person having tendered the old notes to be
      withdrawn;

  (2) identify the old notes to be withdrawn, including the principal amount
      of such old notes; and

  (3) where certificates for old notes are transmitted, specify the name in
      which old notes are registered, if different from that of the
      withdrawing holder.

   If certificates for old notes have been delivered or otherwise identified to
the exchange agent, then, prior to the release of such certificates the
withdrawing holder must also submit the serial numbers of the particular
certificates to be withdrawn and signed notice of withdrawal with signatures
guaranteed by an eligible institution unless such holder is an eligible
institution. If old notes have been tendered pursuant to the procedure for
book-entry transfer described above, any notice of withdrawal must specify the
name and number

                                       30
<PAGE>

of the account at DTC to be credited with the withdrawn old notes and otherwise
comply with the procedures of such facility. We will determine all questions as
to the validity, form and eligibility of such notices, including questions as
to time of receipt; our determination will be final and binding on all parties.
Any tendered old notes so withdrawn will be deemed not to have been validly
tendered for exchange for purposes of the exchange offer. Any old notes which
have been tendered for exchange but which are not exchanged for any reason will
be returned to the holder thereof without cost to such holder. In the case of
old notes tendered by book-entry transfer into the exchange agent's account at
DTC, the old notes withdrawn will be credited to an account maintained with DTC
for the old notes. The old notes will be returned or credited to DTC account as
soon as practicable after withdrawal, rejection of tender or termination of the
exchange offer. Properly withdrawn old notes may be re-tendered by following
one of the procedures described under " How to Tender Old Notes for Exchange"
above at anytime on or prior to midnight, New York City time, on the expiration
date.

Conditions to the Exchange Offer

   We are not required to accept for exchange, or to issue notes in the
exchange offer for any old notes. We may terminate or amend the exchange offer,
if at any time before the acceptance of such old notes for exchange or the
exchange of the exchange notes for such old notes:

  (1) any federal law, statute, rule or regulation shall have been adopted or
      enacted which, in our judgment, would reasonably be expected to impair
      our ability to proceed with the exchange offer;

  (2) any stop order shall be threatened or in effect with respect to the
      registration statement of which this prospectus constitutes a part or
      the qualification of the indenture under the Trust Indenture Act of
      1939, as amended; or

  (3) there shall occur a change in the current interpretation by staff of
      the Commission which permits the exchange notes in exchange for old
      notes to be offered for resale, resold and otherwise transferred by
      such holders, other than broker-dealers and any such holder which is an
      "affiliate" of Western within the meaning of Rule 405 under the
      Securities Act, without compliance with the registration and prospectus
      delivery provisions of the Securities Act, provided that such notes
      acquired in the exchange offer are acquired in the ordinary course of
      such holder's business and such holder has no arrangement or
      understanding with any person to participate in the distribution of
      such exchange notes.

   The preceding conditions are for our sole benefit and we may assert them
regardless of the circumstances giving rise to any such condition. We may waive
the preceding conditions in whole or in part at any time and from time to time
in our sole discretion. If we do so, the exchange offer will remain open for at
least three business days following any waiver of the preceding conditions. Our
failure at any time to exercise the foregoing rights shall not be deemed a
waiver of any such right and each such right shall be deemed an ongoing right
which we may assert at any time and from time to time.

The Exchange Agent

   The Chase Bank of Texas, National Association has been appointed as our
exchange agent for the exchange offer. All executed letters of transmittal
should be directed to our exchange agent at the address set forth below.
Questions and requests for assistance, requests for additional copies of this
prospectus or of the letter of transmittal and requests for notices of
guaranteed delivery should be directed to the exchange agent addressed as
follows:

                               Main Delivery To:
          Chase Bank of Texas, National Association, as Exchange Agent

 By mail, hand or overnight courier to: By Facsimile (for eligible institutions
     Chase Bank of Texas, National                       only):
              Association                             713-216-6686
         600 Travis, Suite 1150
           Houston, TX 77002                     Confirm by telephone:
  Attention: Mauri Cowen--Confidential                713-216-5476

                                       31
<PAGE>

   Delivery of the letter of transmittal to an address other than as set forth
above or transmission of such letter of transmittal via facsimile other than as
set forth above does not constitute a valid delivery of such letter of
transmittal.

Fees and Expenses

   We will not make any payment to brokers, dealers, or others soliciting
acceptance of the exchange offer except for reimbursement of mailing expenses.

   The estimated cash expenses to be incurred in connection with the exchange
offer will be paid by us and are estimated in the aggregate to be approximately
$350,000.

Transfer Taxes

   Holders who tender their old notes for exchange will not be obligated to pay
any transfer taxes in connection with the exchange. If, however, exchange notes
are to be delivered to, or are to be issued in the name of, any person other
than the holder of the old notes tendered, or if a transfer tax is imposed for
any reason other than the exchange of old notes in connection with the exchange
offer, then the holder must pay any such transfer taxes, whether imposed on the
registered holder or on any other person. If satisfactory evidence of payment
of, or exemption from, such taxes is not submitted with the letter of
transmittal, the amount of such transfer taxes will be billed directly to the
tendering holder.

Consequences of Failure to Exchange Old Notes

   Holders who desire to tender their old notes in exchange for notes
registered under the Securities Act should allow sufficient time to ensure
timely delivery. Neither the exchange agent nor Western is under any duty to
give notification of defects or irregularities with respect to the tenders of
old notes for exchange.

   Old notes that are not tendered or are tendered but not accepted will,
following the consummation of the exchange offer, continue to be subject to the
provisions in the indenture regarding the transfer and exchange of the old
notes and the existing restrictions on transfer set forth in the legend on the
old notes and in the offering circular dated June 10, 1999, relating to the old
notes. Except in limited circumstances with respect to specific types of
holders of old notes, we will have no further obligation to provide for the
registration under the Securities Act of such old notes. In general, old notes,
unless registered under the Securities Act, may not be offered or sold except
pursuant to an exemption from, or in a transaction not subject to, the
Securities Act and applicable state securities laws. We do not currently
anticipate that we will take any action to register the old notes under the
Securities Act or under any state securities laws.

   Upon completion of the exchange offer, holders of the old notes will not be
entitled to any further registration rights under the exchange and registration
rights agreement, except under limited circumstances.

   Holders of exchange notes and any old notes which remain outstanding after
consummation of the exchange offer will vote together as a single class for
purposes of determining whether holders of the requisite percentage of the
class have taken certain actions or exercised certain rights under the
indenture. The old notes and the exchange notes will rank pari passu with each
other.

Consequences of Exchanging Old Notes

   Based on interpretations of the staff of the Commission, as set forth in no-
action letters to third parties, we believe that the exchange notes may be
offered for resale, resold or otherwise transferred by holders of such exchange
notes, other than by any holder which is an "affiliate" of Western within the
meaning of Rule 405 under the Securities Act. Such exchange notes may be
offered for resale, resold or otherwise transferred without compliance with the
registration and prospectus delivery provisions of the Securities Act, if:


                                       32
<PAGE>

  (1) such exchange notes are acquired in the ordinary course of such
      holder's business; and

  (2) such holder, other than broker-dealers, has no arrangement or
      understanding with any person to participate in the distribution of
      such exchange notes.

   However, the Commission has not considered the exchange offer in the context
of a no-action letter and we cannot guarantee that the staff of the Commission
would make a similar determination with respect to the exchange offer as in
such other circumstances.

   Each holder, other than a broker-dealer, must furnish a written
representation, at our request, that:

  (1) it is not an affiliate of Western;

  (2) it is not engaged in, and does not intend to engage in, a distribution
      of the exchange notes and has no arrangement or understanding to
      participate in a distribution of exchange notes; and

  (3) it is acquiring the notes in the exchange offer in the ordinary course
      of its business.

   Each broker-dealer that receives exchange notes for its own account in
exchange for old notes must acknowledge that such old notes were acquired by
such broker-dealer as a result of a market-making or other trading activities
and that it will deliver a prospectus meeting the requirements of the
Securities Act in connection with any resale of such exchange notes. See "Plan
of Distribution" for a discussion of the exchange and resale obligations of
broker-dealers in connection with the exchange offer.

   In addition, to comply with state securities laws of certain jurisdictions,
the exchange notes may not be offered or sold in any state unless they have
been registered or qualified for sale in such state or an exemption from
registration or qualification is available and complied with by the holders
selling the exchange notes. We currently do not intend to register or qualify
the sale of the exchange notes in any state where an exemption from
registration or qualification is required and not available.

   The summary in this prospectus of certain provisions of the exchange and
registration rights agreement does not purport to be complete and is subject
to, and is qualified in its entirety by reference to, all the provisions of the
exchange and registration rights agreement, which is filed as an exhibit to the
registration statement to which this prospectus forms a part.

                                       33
<PAGE>

          MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
                           AND RESULTS OF OPERATIONS

   The following discussion and analysis relates to factors that have affected
our consolidated financial condition and results of operations for the six
months ended June 30, 1999 and 1998 and the three years ended December 31,
1998. Certain prior year amounts have been reclassified to conform to the
presentation used in 1999. The quarterly information is derived from unaudited
financial information and is subject to normal, recurring adjustments. The
results for the first half of 1999 are not indicative of results to be expected
for the full year. Reference should also be made to our Consolidated Financial
Statements and related notes thereto and the Consolidated Historical Financial
and Operating Data included elsewhere in this prospectus.

Results of Operations

 Six months ended June 30, 1999 compared to the six months ended June 30, 1998

<TABLE>
<CAPTION>
                                                   For the Six Months
                                                          Ended
                                                        June 30,
                                                   --------------------  Percent
                                                     1999       1998     Change
                                                   --------  ----------  -------
                                                     (Dollars in thousands,
                                                    except per share amounts
                                                       and operating data)
      <S>                                          <C>       <C>         <C>
      Financial results:
      Revenues...................................  $863,945  $1,081,226    (20)%
      Gross profit...............................     6,810      47,774    (85)
      Net income (loss)..........................   (16,940)     10,540    --
      Earnings (loss) per share of common stock--
       basic and diluted.........................      (.69)        .17    --
      Net cash provided by (used in) operating
       activities................................  $ 43,748  $  (51,585)   --
      Operating data:
      Average gas sales (MMcf/D).................     2,050       2,145     (4)
      Average NGL sales (MGal/D).................     2,905       4,640    (37)
      Average gas prices ($/Mcf).................  $   1.93  $     2.07     (7)
      Average NGL prices ($/Gal).................  $    .27  $      .27    --
</TABLE>

   Net income decreased $27.5 million for the six months ended June 30, 1999
compared to the same period in 1998. The decrease in net income for the six
month period was primarily due to losses of $13.9 million associated with the
sales of the Giddings gathering systems and the Katy facility, severance
charges associated with a corporate restructuring of $700,000, an extraordinary
loss on the early extinguishment of debt of $1.1 million and the recognition of
a $9.5 million gain on the sale of the Perkins facility in the first quarter of
1998.

   Revenues from the sale of residue gas decreased approximately $89.9 million
to $715.1 million for the six months ended June 30, 1999 compared to the same
period in 1998, as average gas sales volumes decreased 95 MMcf per day to 2,050
MMcf per day and average gas prices decreased $.14 per Mcf to $1.93 per Mcf.
The decrease in sales volumes was primarily related to the reduction in the
sale of residue gas purchased from third parties. Included in the average gas
price was approximately $272,000 of loss recognized in the six months ended
June 30, 1999 related to futures positions on equity gas volumes. We have
entered into futures positions for a portion of our equity gas for the
remainder of 1999. See further discussion in "Liquidity and Capital Resources--
Risk Management Activities."

   Revenues from the sale of NGLs decreased approximately $92.8 million to
$139.9 million for the six months ended June 30, 1999 compared to the same
period in 1998 as average NGL sales volumes decreased 1,735 MGal per day to
2,905 MGal per day and average NGL prices remained the same at $.27 per gallon.
Plant sales volumes were largely affected by increased volumes taken in kind
and curtailed drilling activity due to low oil prices by a producer behind
Midkiff, and the sale of the Giddings and Edgewood facilities. Included

                                       34
<PAGE>

in the average NGL price was approximately $2.0 million of loss recognized in
the six months ended June 30, 1999 related to futures positions on equity
volumes. We have entered into futures positions for a portion of our equity
production for the remainder of 1999. See further discussion in "Liquidity and
Capital Resources--Risk Management Activities."

   Other net revenue decreased $36.9 million for the six months ended June 30,
1999 compared to the same period in 1998. The decrease for the six months ended
June 30, 1999 is primarily due to the net losses of $22.0 million on the sales
of the Katy, Giddings and MiVida assets compounded by a $14.0 million gain
recognized on the sale of the Perkins facility in March 1998.

   Product purchases decreased $167.1 million for the six months ended June 30,
1999 compared to the same period in 1998. The decrease in product purchases is
primarily due to a decrease in sales volumes of product purchased from third
parties. Overall product purchases as a percentage of residue gas and NGL sales
remained the same at 93% for the six months ended June 30, 1999 as compared to
the same period in 1998.

   Plant operating expense decreased $5.3 million for the six months ended June
30, 1999 compared to the same period in 1998. The decrease was primarily due to
reductions in labor, increased operational efficiencies and asset sales.

   Depreciation, depletion and amortization decreased $4.6 million for the six
month period ended June 30, 1999 compared to the same period in 1998. The
decrease is primarily due to a reduction in depreciation of the Bethel facility
resulting from an impairment charge recorded in the fourth quarter of 1998 and
the sale of assets in 1998 and 1999.

   Selling and administrative expense increased $1.0 million for the six months
ended June 30, 1999 compared to the same period in 1998. The increase was
primarily related to severance payments associated with a restructuring of
operating areas and the aforementioned asset sales.

   Interest expense decreased $543,000 for the six months ended June 30, 1999
compared to the same period in 1998. The decrease is due to lower debt balances
outstanding. The lower debt balances resulted from application of the proceeds
from the sales of assets in 1999 to reduce debt.

     Year ended December 31, 1998 compared to year ended December 31, 1997

<TABLE>
<CAPTION>
                                                  For the Years Ended
                                                     December 31,
                                                 ----------------------  Percent
                                                    1998        1997     Change
                                                 ----------  ----------  -------
                                                 (Dollars in thousands, except
                                                     per share amounts and
                                                        operating data)
      <S>                                        <C>         <C>         <C>
      Financial results:
      Revenues.................................  $2,133,566  $2,385,260    (11)%
      Gross profit.............................      66,568      93,775    (29)
      Net income (loss)........................     (67,205)      1,487    --
      Loss per share of common stock--basic and
       diluted.................................       (2.42)       (.28)  (764)
      Net cash provided by (used in) operating
       activities..............................  $  (35,570) $  114,755    --
      Operating data:
      Average gas sales (MMcf/D)...............       2,200       1,975     11
      Average NGL sales (MGal/D)...............       4,730       4,585      3
      Average gas prices ($/Mcf)...............  $     2.01  $     2.30    (13)
      Average NGL prices ($/Gal)...............  $      .26  $      .36    (28)
</TABLE>

   Net income decreased $68.7 million for the year ended December 31, 1998
compared to 1997. The decrease in net income for the year was primarily due to
a $69.0 million, after-tax, charge for impairment

                                       35
<PAGE>

recorded in connection with the evaluation of a decrease in product prices and
the impact on our Bethel, Black Lake and Sand Dunes facilities, as required by
SFAS No. 121.

   Revenues from the sale of gas decreased approximately $46.0 million for the
year ended December 31, 1998 compared to 1997. Average gas sales volumes
increased 225 MMcf/D to 2,200 MMcf/D for the year ended December 31, 1998
compared to 1997, primarily due to an increase in the sale of gas purchased
from third parties. The increase in volumes sold was more than offset by a
decrease in average gas prices. Average gas prices realized by us decreased
$.29 per Mcf to $2.01 per Mcf for the year ended December 31, 1998 compared to
1997. Included in the realized gas price is approximately $71,000 of loss
recognized in the year ended December 31, 1998 related to futures positions on
equity volumes. We have entered into futures positions for a portion of our
equity gas for 1999 and 2000. See further discussion in "--Liquidity and
Capital Resources--Risk Management Activities."

   Revenues from the sale of NGLs decreased approximately $162.3 million for
the year ended December 31, 1998 compared to 1997. Average NGL sales volumes
increased 145 MGal/D to 4,730 MGal/D for the year ended December 31, 1998
compared to 1997, primarily due to an increase in the sale of NGLs purchased
from third parties. The increase in sales volumes was more than offset by a
decrease in average NGL prices. Average NGL prices realized by us decreased
$.10 per gallon to $.26 per gallon for the year ended December 31, 1998
compared to 1997. Included in the realized NGL price was approximately $7.4
million of gain recognized in the year ended December 31, 1998 related to
futures positions on equity volumes. We have entered into futures positions for
a portion of our equity production for 1999. See further discussion in "--
Liquidity and Capital Resources--Risk Management Activities."

   Revenue associated with electric power marketing decreased approximately
$59.5 million for the year ended December 31, 1998 compared to 1997, as we
discontinued wholesale trading of electric power in 1997, due to a lack of
profitability.

   Other net revenue increased approximately $12.2 million for the year ended
December 31, 1998 compared to 1997. The increase was primarily due to a $14.9
million gain on the sale of our Perkins facility and a $1.0 million option
payment received from RIS in connection with the potential sale of a portion of
our assets in Southwest Wyoming. These increases were offset by decreases of
approximately $2.8 million in earnings from our investments in joint ventures,
primarily due to the decreases in product prices and the sale of our interest
in Redman Smackover. See further discussion at "Business--Significant Projects
and Dispositions--Southwest Wyoming."

   The reduction in product purchases of $232.1 million to $1.9 billion for the
year ended December 31, 1998 compared to 1997, was primarily due to a decrease
in commodity prices. Overall, combined product purchases as a percentage of
sales of all products increased from 92% to 93% for the year ended December 31,
1998 compared to 1997. Over the past several years, we have experienced
narrowing margins in our third-party sales as a result of increasing
competitiveness of the natural gas marketing industry. During the year ended
December 31, 1998, margins on the sale of third-party gas declined and averaged
approximately $.02 per Mcf compared to approximately $.03 per Mcf for 1997.
Contributing to the increase in the product purchase percentage for the year
ended December 31, 1998 were higher payments related to our "keepwhole"
contracts at our Granger facility. Under a "keepwhole" contract, our margin is
reduced when the value of NGLs declines relative to the value of gas. Also
included in product purchases were lower of cost or market writedowns,
primarily related to NGL inventories, of $826,000 and $1.1 million for the
years ended December 31, 1998 and 1997, respectively.

   Plant operating expense increased approximately $7.2 million for the year
ended December 31, 1998 compared to 1997. The increase was primarily due to
compression costs associated with the increasing Powder River basin coal bed
methane production activities and expenses incurred at the Bethel Treating
facility, which became partially operational during the third quarter of 1997.


                                       36
<PAGE>

   Interest expense increased $6.1 million for the year ended December 31, 1998
compared to 1997. The increase is the result of less interest capitalized to
capital projects, primarily the Bethel Treating facility, and larger debt
balances outstanding during the year ended December 31, 1998 compared to 1997.
The larger debt balances resulted primarily from higher product inventory
positions, capital expenditures associated with the Bethel Treating facility
and reduced cashflow from operations.

     Year ended December 31, 1997 compared to year ended December 31, 1996

<TABLE>
<CAPTION>
                                                   For the Years Ended
                                                      December 31,
                                                  ---------------------- Percent
                                                     1997        1996    Change
                                                  ----------  ---------- -------
                                                  (Dollars in thousands, except
                                                      per share amounts and
                                                         operating data)
      <S>                                         <C>         <C>        <C>
      Financial results:
      Revenues..................................  $2,385,260  $2,091,009    14%
      Gross profit..............................      93,775     105,479   (11)
      Net income................................       1,487      27,941   (95)
      Earnings (loss) per share of common
       stock--basic and diluted.................        (.28)        .66   --
      Net cash provided by operating activities.  $  114,755  $  168,266   (32)
      Operating data:
      Average gas sales (MMcf/D)................       1,975       1,794    10
      Average NGL sales (MGal/D)................       4,585       3,744    22
      Average gas prices ($/Mcf)................  $     2.30  $     2.19     5
      Average NGL prices ($/Gal)................  $      .36  $      .41   (12)
</TABLE>

   Net income decreased $26.5 million for the year ended December 31, 1997
compared to 1996. The decrease in net income for the year was primarily due to
a $22.0 million, after-tax, impairment loss recorded in connection with the
evaluation of certain property and equipment, primarily related to our Black
Lake facility and Sand Wash basin assets, as required by SFAS No. 121. Net
income in 1997 increased by a $3.0 million after-tax gain associated with the
sale of a 50% interest in our coal bed methane operations.

   Revenues from the sale of gas increased approximately $216.6 million for the
year ended December 31, 1997 compared to 1996. Average gas sales volumes
increased 181 MMcf per day to 1,975 MMcf per day for the year ended December
31, 1997 compared to 1996, primarily due to an increase in the sale of gas
purchased from third parties. Average gas prices realized by us increased $.11
per Mcf to $2.30 per Mcf for the year ended December 31, 1997 compared to 1996.
Included in the realized gas price was approximately $5.6 million of loss
recognized in the year ended December 31, 1997 related to futures positions on
equity volumes.

   Revenues from the sale of NGLs increased approximately $50.4 million for the
year ended December 31, 1997 compared to 1996. Average NGL sales volumes
increased 841 MGal per day to 4,585 MGal per day for the year ended December
31, 1997 compared to 1996, largely due to an increase of approximately 800 MGal
per day in the sale of NGLs purchased from third parties. Average NGL prices
realized by us decreased $.05 per gallon to $.36 per gallon for the year ended
December 31, 1997 compared to 1996. Included in the realized NGL price was
approximately $5.2 million of gain recognized in the year ended December 31,
1997 related to futures positions on equity volumes.

   Revenue associated with electric power marketing increased $28.8 million for
the year ended December 31, 1997 compared to 1996, primarily because we had
minimal transactions in this market during 1996. Due to a lack of
profitability, we elected to discontinue trading electric power and began to
evaluate our role in this emerging business, during the second half of 1997.

   The increase in product purchases of $302.3 million to $2.1 billion for the
year ended December 31, 1997 compared to 1996, was primarily a combination of
higher gas prices and increased sales of NGLs purchased

                                       37
<PAGE>

from third parties. Contributing to the increase in product purchases for the
year ended December 31, 1997 compared to 1996 were higher payments to producers
related to our "keepwhole" contracts at our Granger facility. Under a
"keepwhole" contract, our margin is reduced when the value of NGLs declines
relative to the value of gas. Also contributing to the increases in product
purchases for the year ended December 31, 1997 compared to 1996, were lower of
cost or market write-downs of NGL and gas inventories of $1.1 million and
$129,000, respectively.

   Plant operating expense increased approximately $5.0 million for the year
ended December 31, 1997 compared to 1996. The increase was primarily due to
additional compression cost associated with the MIGC pipeline. Additional costs
associated with the Bethel Treating facility adversely affected our results of
operations for the year ended December 31, 1997. As a result of start-up costs
associated with opening the facility and depreciation, the Bethel Treating
facility did not contribute positively to earnings in 1997.

   Depreciation, depletion and amortization decreased $4.0 million for the year
ended December 31, 1997 compared to 1996. The decrease was primarily due to
decreases in produced volumes related to our Black Lake facility which resulted
in a decrease in the associated depletion.

   Interest expense decreased $7.0 million for the year ended December 31, 1997
compared to 1996. The decrease in interest expense was primarily due to lower
average outstanding debt balances due to our use of the net proceeds from the
November 1996 public offering of 6,325,000 shares of Common Stock to reduce
indebtedness under the Revolving Credit Facility.

   Overall, profitability for the year ended December 31, 1997 was less than
anticipated due to several factors. Combined product purchases as a percentage
of all product sales increased from 91% to 92% for the year ended December 31,
1997 compared to 1996. Over the past several years, we have experienced
narrowing margins related to the increasing competitiveness of the natural gas
marketing industry. During the year ended December 31, 1997, our marketing
margins were reduced by approximately 50% compared to 1996. Included in the
sale of gas and product purchases for the last half of 1997, was the sale of
approximately 11.5 Bcf of gas, previously stored in the Katy facility, at a
margin of approximately $.20 per Mcf.

 Liquidity and Capital Resources

   Our sources of liquidity and capital resources historically have been net
cash provided by operating activities, funds available under our financing
facilities and proceeds from offerings of debt and equity securities. In the
past, these sources have been sufficient to meet our needs and finance the
growth of our business. We can give no assurance that the historical sources of
liquidity and capital resources will be available for future development and
acquisition projects, and we may be required to seek alternative financing
sources. In 1998, sources of liquidity included the sales of the Perkins
facility and the Edgewood facility and related production. In the second
quarter of 1999, we completed the sales of our Giddings, Katy and MiVida
facilities. In connection with the sale of Katy, we sold gas held in storage at
this facility. The total gross proceeds from these 1999 transactions were
approximately $160.0 million. We used the proceeds from these sales to reduce
debt. Product prices, sales of inventory, our success in increasing the number
and efficiency of our facilities and the volumes of natural gas processed by
these facilities, the margin on third-party product purchased for resale, as
well as the timely collection of our receivables will affect all future net
cash provided by operating activities. Additionally, our future growth will be
dependent upon obtaining additions to dedicated plant reserves, acquisitions,
new project development, marketing, efficient operation of our facilities and
our ability to obtain financing at favorable terms.

   Given the depressed oil and NGL prices we experienced in 1998 and throughout
the first half of 1999 and the disappointing results from the Bethel treating
facility, we successfully negotiated amendments to our various financing
facilities which are intended to provide more flexibility in a low price
environment. There can be no assurance that we can obtain further amendments or
waivers in the future, if necessary, or that the terms would be favorable to
us. To strengthen our credit ratings and to reduce our overall debt
outstanding, we will

                                       38
<PAGE>

continue to dispose of non-strategic assets and investigate alternative
financing sources, including project-financing, joint ventures, issuance of
public debt and operating leases.

   We believe that the amounts available to be borrowed under the Revolving
Credit Facility, together with net cash provided by operating activities and
the sale of non-strategic assets, will provide us with sufficient funds to
connect new reserves, maintain our existing facilities and complete our current
capital expenditure program. Depending on the timing and the amount of our
future projects, we may be required to seek additional sources of capital. Our
ability to secure such capital is restricted by our financing facilities,
although we may request additional borrowing capacity from our lenders, seek
waivers from our lenders to permit us to borrow funds from third parties, seek
replacement financing facilities from other lenders, use stock as a currency
for acquisitions, sell existing assets or a combination of such alternatives.
While we believe that we would be able to secure additional financing, if
required, we can provide no assurance that we will be able to do so or as to
the terms of any such financing. We also believe that cash provided by
operating activities and amounts available under our Revolving Credit Facility
will be sufficient to meet our debt service and preferred stock dividend
requirements for the remainder of 1999.

   Below is a summary of our sources and uses of funds for the six months ended
June 30, 1999 and the year ended December 31, 1998 (in thousands):

<TABLE>
<CAPTION>
                                                       Six Months    Year Ended
                                                          Ended     December 31,
                                                      June 30, 1999     1998
                                                      ------------- ------------
      <S>                                             <C>           <C>
      Sources of funds:
      Borrowings on Revolving Credit Facility.......   $1,611,300    $3,230,400
      Proceeds from the dispositions of property and
       equipment....................................      148,100        78,775
      Proceeds from issuance of long-term debt......      155,000           --
      Net cash provided by operating activities.....       43,748           --
      Proceeds from exercise of common stock
       options......................................          --             23
                                                       ----------    ----------
      Total sources of funds........................   $1,958,148    $3,309,198
                                                       ==========    ==========
      Uses of funds:
      Payments related to long-term debt agreements.   $1,908,471    $3,166,920
      Capital expenditures..........................       34,347       105,216
      Net cash used in operating activities.........          --         35,570
      Dividends paid................................        8,432        16,869
                                                       ----------    ----------
      Total uses of funds...........................   $1,951,250    $3,324,575
                                                       ==========    ==========
</TABLE>

   Additional sources of liquidity available to us are our inventories of gas
and NGLs in storage facilities. We store gas and NGLs primarily to ensure an
adequate supply for long-term sales contracts and for resale during periods
when prices are favorable. We held gas in storage and in imbalances of
approximately 7.5 Bcf at an average cost of $1.94 per Mcf at June 30, 1999
compared to 18.5 Bcf at an average cost of $2.10 per Mcf at June 30, 1998 at
our storage facilities. At June 30, 1999, we had hedging contracts in place for
anticipated sales of approximately 6.5 Bcf of stored gas at a weighted average
price of $2.26 per Mcf for the stored inventory.

   We held NGLs in storage of 8,000 MGal, consisting primarily of propane and
normal butane, at an average cost of $.28 per gallon and 50,000 MGal at an
average cost of $.28 per gallon at June 30, 1999 and 1998, respectively, at
various third-party storage facilities. At June 30, 1999, we had no significant
hedging contracts in place for anticipated sales of stored NGLs.

   Historically, while certain individual plants have experienced declines in
dedicated reserves, we have been successful in connecting additional reserves
to more than offset the natural declines. There has been a reduction in
drilling activity, primarily in basins that produce oil and casinghead gas,
from levels that existed in prior years. However, higher gas prices in 1997 and
1998, improved technology, e.g., 3-D seismic and horizontal

                                       39
<PAGE>

drilling, and increased pipeline capacity from the Rocky Mountain region have
stimulated drilling in the Powder River basin and Southwest Wyoming. The
overall level of drilling will depend upon, among other factors, the prices for
gas and oil, the drilling budgets of third-party producers, the energy policy
of the federal government and the availability of foreign oil and gas, none of
which is within our control. We have increased our dedicated estimated plant
reserves from 2.2 Tcf at December 31, 1993 to 3.1 Tcf at December 31, 1998. On
average, over this five year period, including the reserves associated with our
joint ventures and partnerships and excluding the facilities sold during this
period, we connected new reserves to our facilities to replace approximately
165% of throughput over this period. There is no assurance that we will
continue to be successful in replacing the dedicated reserves processed at our
facilities.

   We have effective shelf registration statements filed with the Commission
for an aggregate of approximately $200 million of debt securities and preferred
stock, along with the shares of common stock, if any, into which such
securities are convertible, and approximately $62 million of debt securities,
preferred stock or common stock.

 Capital Investment Program

   For the years ended December 31, 1998, 1997 and 1996 we expended $105.2
million, $198.9 million and $74.6 million, respectively, on new projects and
acquisitions. For the year ended December 31, 1998, our expenditures consisted
of the following: (i) $50.4 million for new well connects, system expansions,
the Bethel treating facility and asset consolidations; (ii) $10.6 million for
maintaining existing facilities; (iii) $41.6 million for exploration and
production activities and acquisitions; and (iv) $2.6 million of miscellaneous
expenditures.

   Largely as a result of low commodity prices, primarily affecting NGL
products, we have reduced our budget for capital expenditures in 1999 from the
levels expended in 1997 and 1998. We expect capital expenditures related to
existing operations to be approximately $67.0 million during 1999, consisting
of the following: (i) approximately $39.6 million related to gathering,
processing and pipeline assets, of which $6.3 million is for maintaining
existing facilities; (ii) approximately $24.6 million related to exploration
and production activities; and (iii) approximately $2.8 million for
miscellaneous items. Overall, capital expenditures in the Powder River basin
coal bed methane development and in Southwest Wyoming operations represent 53%
and 22%, respectively, of the total 1999 budget. As of June 30, 1999, we have
expended $34.4 million, consisting of the following: (i) $19.9 million for new
connects, system expansions and asset consolidations; (ii) $2.2 million for
maintaining existing facilities; (iii) $11.7 million for exploration and
production activities; and (iv) $598,000 related to other miscellaneous items.

 Financing Facilities

   Revolving Credit Facility. The Revolving Credit Facility is with a syndicate
of banks and provides for a maximum borrowing commitment of $250 million
consisting of an $83 million 364-day Revolving Credit Facility, or Tranche A,
and a five-year $167 million Revolving Credit Facility, or Tranche B. At June
30, 1999, $31.5 million was outstanding on this facility. The Revolving Credit
Facility bears interest at certain spreads over the Eurodollar rate, or the
greater of the Federal Funds rate or the agent bank's prime rate. We have the
option to determine which rate will be used. We also pay a facility fee on the
commitment. The interest rate spreads and facility fee are adjusted based on
our debt to capitalization ratio and range from .75% to 2.00%. At June 30,
1999, the interest rate payable on the facility was 6.5%. We are required to
maintain a total debt to capitalization ratio of not more than 60% through
December 31, 2000 and of not more than 55% thereafter, and a senior debt to
capitalization ratio of not more than 40% beginning September 30, 1999 through
December 31, 2001 and of not more than 35% thereafter. The agreement also
requires a ratio of EBITDA, excluding certain non-recurring items, to interest
and dividends on preferred stock as of the end of any fiscal quarter, for the
four preceding fiscal quarters, of not less than 1.35 to 1.0 beginning June 30,
1999 and increasing to 3.25 to 1.0 by December 31, 2002. This facility is
guaranteed and secured via a pledge of the stock of certain of our
subsidiaries. We generally utilize excess daily funds to reduce any outstanding
balances on the Revolving Credit Facility and associated interest expense, and
we intend to continue such practice.

                                       40
<PAGE>

   Master Shelf Agreement. In December 1991, we entered into a Master Shelf
agreement with The Prudential Insurance Company of America. Amounts outstanding
under the Master Shelf agreement at June 30, 1999 are as indicated in the
following table (dollars in thousands):

<TABLE>
<CAPTION>
                            Interest
   Issue Date       Amount    Rate    Final Maturity               Principal Payments Due
   ----------      -------- -------- ----------------- -----------------------------------------------
<S>                <C>      <C>      <C>               <C>
October 27, 1992   $  8,334  7.51%   October 27, 1999  single payment at maturity
October 27, 1992     25,000  7.99%   October 27, 2003  $8,333 on each of October 27, 2001 through 2003
December 27, 1993    25,000  7.23%   December 27, 2003 single payment at maturity
October 27, 1994     25,000  9.05%   October 27, 2001  single payment at maturity
October 27, 1994     25,000  9.24%   October 27, 2004  single payment at maturity
July 28, 1995        50,000  7.61%   July 28, 2007     $10,000 on each of July 28, 2003 through 2007
                   --------
                   $158,334
                   ========
</TABLE>

   In April 1999, effective January 1999, we amended our agreement with
Prudential to reflect the following provisions. We are required to maintain a
current ratio, as defined therein, of at least .9 to 1.0, a minimum tangible
net worth equal to the sum of $300 million plus 50% of consolidated net
earnings earned from January 1, 1999 plus 75% of the net proceeds of any equity
offerings after January 1, 1999, and a total debt to capitalization ratio of
not more than 60% through December 31, 2001 and of not more than 55%
thereafter. A senior debt to capitalization ratio was implemented of 40%
through March 2002 and 35% thereafter. This amendment also requires an EBITDA
to interest ratio of not less than 1.75 to 1.0 increasing to a ratio of not
less than 3.75 to 1.0 by March 31, 2002 and an EBITDA to interest on senior
debt ratio of not less than 1.75 to 1.0 increasing to a ratio of not less than
5.50 to 1.0 by March 31, 2002. EBITDA in these calculations excludes certain
non-recurring items. In addition, we are prohibited from declaring or paying
dividends that in the aggregate exceed the sum of $50 million plus 50% of
consolidated net income earned after June 30, 1995, or minus 100% of a net
loss, plus the aggregate net cash proceeds received after June 30, 1995 from
the sale of any stock. At June 30, 1999, approximately $27.0 million was
available under this limitation. We presently intend to finance the $8.3
million payment due in October 1999 with amounts available under the Revolving
Credit Facility. Borrowings under the Master Shelf agreement are guaranteed and
secured via a pledge of the stock of certain of our subsidiaries.

   In June 1999, we prepaid approximately $33.3 million of notes outstanding
under the Master Shelf agreement with proceeds from the offering of the
Subordinated notes.

   1995 Senior Notes. In 1995, we sold $42 million of Senior notes, the 1995
Senior notes, to a group of insurance companies with an interest rate of 8.16%
per annum. In March 1999, we prepaid $15 million of the principal amount
outstanding on the 1995 Senior notes at par. These payments were financed by a
portion of the $37 million Bridge Loan described below and by amounts available
under the Revolving Credit Facility. The remaining principal amount outstanding
of $27 million is due in a single payment in December 2005. The 1995 Senior
notes are guaranteed and secured via a pledge of the stock of certain of our
subsidiaries. This facility contains covenants similar to the Master Shelf
agreement. In the second quarter of 1999, we posted letters of credit for a
total of approximately $10.8 million for the benefit of the holders of the 1995
Senior notes.

   We are currently paying an annual fee of not more than .65% on the amounts
outstanding on the Master Shelf Agreement and the 1995 Senior notes. This fee
will continue until we have received an implied investment grade rating on our
senior secured debt. On the portion of the 1995 Senior notes for which a letter
of credit is posted, this annual fee will not be due.

   1993 Senior Notes. In 1993, we sold $50 million of 7.65% Senior notes, the
1993 Senior notes, to a group of insurance companies. Scheduled annual
principal payments of $7.1 million on the 1993 Senior notes were made on April
30 of 1997 and 1998. In February 1999, we prepaid $33.5 million of the total
principal amounts

                                       41
<PAGE>

outstanding of $35.6 million at par. These payments were financed by a portion
of the $37 million Bridge Loan. We prepaid the remaining outstanding principal
of $2.1 million in April 1999 with amounts available under the Revolving Credit
Facility.

   In connection with the repayments on the Master Shelf agreement, the 1995
Senior notes and the 1993 Senior notes, we incurred approximately $1.8 million
of pre-tax yield maintenance and other charges. These charges are reflected as
an extraordinary loss from early extinguishment of long-term debt in the second
quarter of 1999.

   Bridge Loan. In February 1999, in order to finance prepayments of amounts
outstanding on the 1993 and 1995 Senior notes, we entered into a Bridge Loan
agreement in the amount of $37 million with our agent bank. This facility was
paid in full in April 1999 with proceeds from the sale of the Katy facility.

   Senior Subordinated Notes. In June 1999, we sold $155.0 million of Senior
Subordinated notes in a private placement. The Subordinated notes bear interest
at 10% and were priced at 99.225% to yield 10.125%. These notes contain
maintenance covenants which include limitations on debt incurrence, restricted
payments, liens and sales of assets. The Subordinated notes are unsecured and
are guaranteed on a subordinated basis by certain of Western's subsidiaries. We
anticipate completing an exchange offer for the exchange notes, which will be
registered with the SEC for public trading, in the fourth quarter of 1999.

   Covenant Compliance. Taking into account all the covenants contained in
these agreements, we had approximately $97.0 million of available borrowing
capacity at June 30, 1999. In the second quarter of 1999, we amended our
various financing facilities providing for financial flexibility and covenant
modifications and issued the Subordinated notes. These amendments were needed
given the depressed commodity pricing experienced in the industry in general
and the disappointing results we have experienced at our Bethel Treating
facility. We can provide no assurance that further amendments or waivers can be
obtained in the future, if necessary, or that the terms would be favorable to
us. To strengthen our credit ratings and to reduce our overall debt
outstanding, we will continue to dispose of non-strategic assets and
investigate alternative financing sources including the issuance of public
debt, project-financing, joint ventures and operating leases.

 Risk Management Activities

   Our commodity price risk management program has two primary objectives. The
first goal is to preserve and enhance the value of our equity volumes of gas
and NGLs with regard to the impact of commodity price movements on cash flow,
net income and earnings per share in relation to those anticipated by our
operating budget. The second goal is to manage price risk related to our gas,
crude oil and NGL marketing activities to protect profit margins. This risk
relates to hedging fixed price purchase and sale commitments, preserving the
value of storage inventories, reducing exposure to physical market price
volatility and providing risk management services to a variety of customers.

   We utilize a combination of fixed price forward contracts, exchange-traded
futures and options, as well as fixed index swaps, basis swaps and options
traded in the over-the-counter, or OTC, market to accomplish these objectives.
These instruments allow us to preserve value and protect margins because gains
or losses in the physical market are offset by corresponding losses or gains in
the value of the financial instruments.

   We use futures, swaps and options to reduce price risk and basis risk. Basis
is the difference in price between the physical commodity being hedged and the
price of the futures contract used for hedging. Basis risk is the risk that an
adverse change in the futures market will not be completely offset by an equal
and opposite change in the cash price of the commodity being hedged. Basis risk
exists in natural gas primarily due to the geographic price differentials
between cash market locations and futures contract delivery locations.

   We enter into futures transactions on the New York Mercantile Exchange, or
NYMEX, and the Kansas City Board of Trade and through OTC swaps and options
with various counterparties, consisting primarily of

                                       42
<PAGE>

financial institutions and other natural gas companies. We conduct our standard
credit review of OTC counterparties and have agreements with these parties that
contain collateral requirements. We generally use standardized swap agreements
that allow for offset of positive and negative exposures. OTC exposure is
marked to market daily for the credit review process. Our OTC credit risk
exposure is partially limited by our ability to require a margin deposit from
our major counterparties based upon the mark-to-market value of their net
exposure. We are subject to margin deposit requirements under these same
agreements. In addition, we are subject to similar margin deposit requirements
for our NYMEX counterparties related to our net exposures.

   The use of financial instruments may expose us to the risk of financial loss
in certain circumstances, including instances when (i) equity volumes are less
than expected, (ii) our customers fail to purchase or deliver the contracted
quantities of natural gas or NGLs, or (iii) our OTC counterparties fail to
perform. To the extent that we engage in hedging activities, we may be
prevented from realizing the benefits of favorable price changes in the
physical market. However, we are similarly insulated against decreases in these
prices.

   We hedged a portion of our equity volumes of gas and NGLs in 1999, at
pricing levels approximating our 1999 operating budget. Our equity hedging
strategy establishes a minimum and maximum price while allowing market
participation between these levels. As of June 30, 1999, we had hedged
approximately 71% of our anticipated equity gas for the remainder of 1999 at a
weighted average NYMEX equivalent minimum price of $2.00 per Mcf. Additionally,
we have hedged approximately 77% of our anticipated equity NGLs for the
remainder of 1999 at a weighted average composite Mont Belvieu and West Texas
Intermediate crude oil equivalent minimum price of $.23 per gallon.

   At June 30, 1999, we had $28,000 of gains deferred in inventory that will be
recognized over the remainder of 1999, and will be offset by margins from our
related forward fixed price hedges and physical sales. At June 30, 1999, we had
unrecognized net losses of $265,000 related to financial instruments that were
offset by corresponding unrecognized net gains from our obligations to sell
physical quantities of gas and NGLs.

   We enter into speculative futures, swap and option trades on a very limited
basis for purposes that include testing of hedging techniques. Our policies
contain strict guidelines for these trades including predetermined stop-loss
requirements and net open position limits. Speculative futures, swap and option
positions are marked to market at the end of each accounting period and any
gain or loss is recognized in income for that period. Net gains or losses from
these speculative activities for the six months ended June 30, 1999 and 1998
were not material.

 Natural Gas Derivative Market Risk

   As of December 31, 1998, we held a notional quantity of approximately 370
Bcf of natural gas futures, swaps and options extending from January 1999 to
December 2000 with a weighted average duration of approximately four months.
This notional quantity was comprised of approximately 178 Bcf of long positions
and 192 Bcf of short positions. As of December 31, 1997, we held a notional
quantity of approximately 480 Bcf of natural gas futures, swaps and options
extending from January 1998 to December 1999 with a weighted average duration
of approximately four months. This notional quantity was comprised of
approximately 230 Bcf of long positions and 250 Bcf of short positions.

   We use a Value-at-Risk (VaR) model designed by J.P. Morgan as one measure of
market risk for our natural gas portfolio. The VaR calculated by this model
represents the maximum change in market value over the holding period at the
specified statistical confidence interval. The VaR model is generally based
upon J.P. Morgan's RiskMetrics (TM) methodology using historical price data to
derive estimates of volatility and correlation for estimating the contribution
of tenor and location risk. The VaR model assumes a one-day holding period and
uses a 95% confidence level.


                                       43
<PAGE>

   As of December 31, 1998, the calculated VaR of our entire natural gas
portfolio of futures, swaps and options was approximately $1.5 million. This
figure includes the risk related to our entire portfolio of natural gas
financial instruments and does not include the related underlying hedged
physical transactions.

   All financial instruments for which there are no offsetting physical
transactions are treated as either the hedge of an anticipated transaction or a
speculative trade. As of December 31, 1998, the VaR of these type of
transactions for natural gas was approximately $500,000.

 Crude Oil and NGL Derivative Market Risk

   As of December 31, 1998, we held a notional quantity of approximately
177,000 MGal of NGL futures, swaps and options extending from January 1999 to
December 1999 with a weighted average duration of approximately six months.
This notional quantity was comprised of approximately 129,000 MGal of long
positions and 48,000 MGal of short positions. As of December 31, 1997, we held
a notional quantity of approximately 148,000 MGal of NGL futures, swaps and
options extending from January 1998 to December 1998 with a weighted average
duration of approximately five months. This notional quantity was comprised of
approximately 93,000 MGal of long positions and 55,000 MGal of short positions.

   As of December 31, 1998, we had sold 90,000 barrels per month of NYMEX crude
swaps for 1999 at an average price of $13.10 per barrel. In addition, we had
purchased 90,000 barrels per month of $15.00 per barrel NYMEX calls for July
1999 through December 1999 settlement. We held no crude oil futures, swaps or
options for settlement beyond 1999.

   As of December 31, 1998, we had purchased puts for 200,000 barrels per month
of OPIS Mt. Belvieu monthly average settlement at $0.210 per gallon to hedge a
portion of our equity production of propane and butanes for 1999.

   As of December 31, 1998, we had purchased puts for 50,000 barrels per month
of OPIS Mt. Belvieu monthly average settlement at $0.155 per gallon of purity
ethane to hedge a portion of our equity production of ethane for 1999.

   As of December 31, 1998, we held no NGL futures, swaps or options for
settlement beyond 1999.

   As of December 31, 1998, the estimated fair value of the aforementioned
crude oil and NGL options held by us was approximately $315,000.

 Foreign Currency Derivative Market Risk

   We enter into physical gas transactions payable in Canadian dollars. We
enter into forward purchases and sales of Canadian dollars from time to time to
fix the cost of our future Canadian dollar denominated natural gas purchase,
sale, storage and transportation obligations. This is done to protect marketing
margins from adverse changes in the U.S. and Canadian dollar exchange rate
between the time the commitment for the payment obligation is made and the
actual payment date of such obligation. As of December 31, 1998, the notional
value of these contracts was approximately $11.0 million in Canadian dollars.
As of December 31, 1997, the notional value of these contracts was
approximately $5.5 million in Canadian dollars, which approximated their fair
market value.

 Year 2000

   We have made a comprehensive review of our computer systems to identify the
systems that could be affected by the Year 2000 issue and are in the process of
identifying and making the appropriate modifications to these computer systems.
We have: (i) created a Year 2000 awareness program to educate employees; (ii)
compiled an inventory of all systems; (iii) developed system test plans as
appropriate; (iv) substantially

                                       44
<PAGE>

completed the testing and remediation as required for both information and non-
information technology systems; and (v) begun preparation of our contingency
plans to minimize the impact of a Year 2000 related failure caused either
internally or externally. Additionally, we have initiated a program under which
we survey our business counterparties periodically regarding their Year 2000
conversion and contingency plans. Currently, we anticipate spending
approximately $1.5 million, of which approximately 79% is currently committed,
for remediation purposes, which is primarily consisting of hardware and
operating system upgrades. We have incurred and will continue to incur internal
staff costs as well as some consulting and other expenses, which have been and
are expected to continue to be immaterial. We believe our Year 2000 conversion
project to be substantially complete. Currently, we believe our most
significant risk for the Year 2000 issue is that the systems of other companies
on which we rely will not be Year 2000 compliant and that any failure to
convert by another company will have an adverse effect on our results of
operations or financial position. In order to mitigate this risk, we continue
to develop contingency plans and are surveying our vendors and customers to
verify the status of their conversion and contingency plans.

                                    BUSINESS

 General

   Western gathers, processes, treats, develops and produces, transports and
markets natural gas and NGLs. We operate in major gas-producing basins in the
Rocky Mountain, Mid-Continent, Gulf Coast and Southwestern regions of the
United States. We design, construct, own and operate natural gas gathering
systems and processing and treating facilities in order to provide our
customers with a broad range of services from the wellhead to the sales
delivery point.

   On a pro forma basis, after giving effect to the April 1999 sales of our
Katy gas storage and hub facility and our Giddings gas gathering system and the
June 1999 sale of our MiVida treating facility:

  . at June 30, 1999, we owned approximately $ 1.0 billion of assets,
    including approximately 8,000 miles of gathering systems, 21 processing
    and treating facilities and two regulated natural gas pipelines, and at
    December 31, 1998 we owned approximately 239 Bcf of net proven natural
    gas reserves;

  . for both the year ended December 31, 1998 and the six months ended June
    30, 1999, we had average throughput at our facilities of 1.0 Bcf/D of
    natural gas;

  . for the year ended December 31, 1998 and the six months ended June 30,
    1999, we generated revenues of $2.1 billion and $864.4 million,
    respectively, and earnings before interest expense, income taxes,
    depreciation, depletion and amortization, non-cash impairment charges and
    gains or losses on the sales of assets, or EBITDA, of $66.7 million and
    $32.9 million, respectively.

   Our operations are conducted through the following four business segments:

  . Gathering and Processing--Our operations are in well-established basins
    such as the Permian, Anadarko, Powder River, Green River and San Juan
    basins. We connect oil and gas wells to our gathering systems for
    delivery to our processing or treating plants. At our plants we process
    natural gas to extract NGLs and we treat natural gas in order to meet
    pipeline specifications. We provide these services to major oil and gas
    companies and to various sized independent producers.

  . Production--We develop and, in limited cases, explore for natural gas,
    primarily with third-party producers. We participate in exploration and
    production in order to enhance and support our existing gathering and
    processing operations. We sell the natural gas that we produce to third
    parties. Our producing properties are primarily located in the Powder
    River and Green River basins of Wyoming.

  . Marketing--We buy and sell natural gas and NGLs in the wholesale market
    in the United States and in Canada. We provide storage, transportation,
    scheduling, peaking and other services to our customers. Our customers
    for these services include utilities, local distribution companies,
    industrial end-users and other energy marketers.


                                       45
<PAGE>

  . Transportation--We transport natural gas through our regulated pipelines
    for producers and energy marketers under fee schedules regulated by state
    or federal agencies.

   Historically, we have derived over 95% of our revenues from the sale of gas
and NGLs. Our revenues by type of operation are as follows (dollars in
thousands):

<TABLE>
<CAPTION>
                            Six Months Ended June 30,                   Year Ended December 31,
                         --------------------------------- --------------------------------------------------
                           1999      %       1998      %      1998      %      1997      %      1996      %
                         --------  -----  ---------- ----- ---------- ----- ---------- ----- ---------- -----
<S>                      <C>       <C>    <C>        <C>   <C>        <C>   <C>        <C>   <C>        <C>
Sale of gas............. $715,055   82.8  $  804,972  74.4 $1,611,521  75.5 $1,657,479  69.5 $1,440,882  68.9
Sale of NGLs............  139,854   16.2     232,624  21.5    449,696  21.1    611,969  25.7    561,581  26.9
Processing,
 Transportation and
 Storage revenues.......   24,319    2.8      21,991   2.1     44,743   2.1     40,906   1.7     44,943   2.1
Sale of electric power..      --     --          --    --          20   --      59,477   2.5     30,667   1.5
Other, net..............  (15,283)  (1.8)     21,639   2.0     27,586   1.3     15,429    .6     12,936    .6
                         --------  -----  ---------- ----- ---------- ----- ---------- ----- ---------- -----
Total revenues.......... $863,945  100.0  $1,081,226 100.0 $2,133,566 100.0 $2,385,260 100.0 $2,091,009 100.0
                         ========  =====  ========== ===== ========== ===== ========== ===== ========== =====
</TABLE>

   In order to reduce our overall debt level and provide us with additional
liquidity to fund our key growth opportunities, in 1998 we sold our Edgewood
processing plant and our interest in the production served by this facility and
our Perkins gas gathering and processing facility for an aggregate of $75.0
million, and in April 1999 we sold our Katy facility and a portion of the
associated natural gas inventory for gross proceeds of $111.7 million and our
Giddings facility for gross proceeds of $36.0 million. In June 1999, we sold
our MiVida treating facility for gross proceeds of $12.0 million. As a result
of these sales in 1999 and the offering of notes and the use of proceeds
therefrom, our total debt was $371.8 million at June 30,1999.

                               Business Strategy

   Our long-term business plan is to increase our profitability by: (i)
optimizing the profitability of existing operations; (ii) entering into
additional agreements with third-party producers who dedicate acreage to our
gathering and processing operations; and (iii) investing in projects or
acquiring assets that complement and extend our core natural gas gathering,
processing, production and marketing businesses.

   Capital expenditures related to existing operations are expected to be
approximately $67.0 million during 1999. This includes approximately $39.6
million related to gathering, processing and pipeline assets and approximately
$18.5 million for the development of gas reserves in the Powder River basin.

 Optimize Profitability

   We continuously seek to improve the profitability of our existing operations
by:

  . increasing natural gas throughput levels through new well connections and
    expansion of gathering systems. In 1999, we expect to spend approximately
    $8.0 million on additional well connections and compression and gathering
    system expansions. We increased throughput levels at our facilities from
    895 MMcf/D in 1993 to 1,162 MMcf/D in 1998.

  . increasing our efficiency through the consolidation of existing gathering
    and processing facilities.  Consolidations allow us to increase the
    throughput of the surviving plant while eliminating a majority of the
    operating costs of the closed plant. For example, in 1998 we combined the
    processing operations of our Four Corners and San Juan River plants.

  . evaluating assets. We routinely review the economic performance of each
    of our operating facilities to ensure that a targeted rate of return is
    achieved. If an operating facility is not generating targeted returns we
    will explore various options, such as consolidation with other Western-
    owned or third-party-owned facilities, dismantlement, asset swap or
    outright sale.


                                       46
<PAGE>

  . controlling operating and overhead expenses. We recently restructured our
    operational and administrative organization which we expect will result
    in approximately $5.0 million in savings in plant operating and selling
    and administrative expenses in 1999 from those incurred in 1998.

 Increase Dedicated Acreage

   Our operations are located in some of the most actively drilled oil and gas
producing basins in the United States. We enter into agreements under which we
gather and process natural gas produced on acreage dedicated to us by third
parties. We continually seek to obtain production from new wells and newly
dedicated acreage in order to replace declines in existing reserves that are
dedicated for gathering and processing at our facilities. We have increased our
dedicated estimated reserves from 2.2 Tcf at December 31, 1993 to 3.1 Tcf at
December 31, 1998. On average, over this five-year period, including the
reserves associated with our joint ventures and partnerships and excluding the
reserves associated with the facilities sold during this period, we connected
new reserves to our facilities to replace approximately 165% of throughput over
this period. In order to obtain additional dedicated acreage and to secure
contracts on favorable terms, we may participate to a limited extent with
producers in exploration and production activities. For the same reason, we may
also offer to sell an ownership interest in our facilities to selected
producers.

 Expansion of Core Business

   We will continue to invest in projects that complement and extend our core
natural gas gathering, processing, production and marketing businesses. We will
also expand our gathering, processing and production operations into new
geographic areas. During 1999, the majority of our capital budget will be spent
in the Powder River basin of Wyoming and in Southwest Wyoming. These projects
include:

  . continued development of Powder River basin coal bed methane reserves to
    increase natural gas production and throughput at our existing gathering
    and transportation facilities;

  . completion of the Fort Union gathering pipeline and treater, which will
    enable us and others to increase gas production in the Powder River basin
    and connect to major interstate pipelines for transportation; and

  . continued expansion of our gathering systems and participation in the
    drilling for additional natural gas reserves in Southwest Wyoming.

                                       47
<PAGE>

 Principal Facilities

   The following tables provide information concerning our principal facilities
at June 30, 1999. We also own and operate several smaller treating, processing
and transmission facilities located in the same areas as its other facilities.

<TABLE>
<CAPTION>
                                                            Average for the Six Months Ended
                                                                     June 30, 1999
                                        Gas        Gas     ----------------------------------
                                     Gathering Throughput      Gas         Gas        NGL
                         Year Placed  Systems   Capacity   Throughput  Production  Production
  Plant Facilities (1)   In Service  Miles(2)  (MMcf/D)(3) (MMcf/D)(4) (MMcf/D)(5)  (MGal/D)(5)
  --------------------   ----------- --------- ----------- ----------- ----------- ----------
<S>                      <C>         <C>       <C>         <C>         <C>         <C>
Southern Region:
Texas
   Bethel Treating (6)..    1997          86        350          73         69         --
   Giddings
    Gathering(14).......    1979         --          80          48         31          66
   Gomez Treating.......    1971         385        280         109        101         --
   Midkiff/Benedum......    1955       2,139        165         142         92         864
   Mitchell Puckett
    Gathering...........    1972          86        120         109         71           2
   MiVida Treating
    (6)(16).............    1972         --         150          46         44         --
   Rosita Treating......    1973         --          60          39        --          --
Louisiana
   Black Lake...........    1966          56         75          11          6          17
   Toca (7)(8)..........    1958         --         160          80         76          67
Northern Region:
Wyoming
   Coal Bed Methane
    Gathering...........    1990         389        105         116         88         --
   Granger (7)(9)(10)...    1987         464        235         154        138         246
   Hilight Complex (7)..    1969         622         80          20         16          65
   Kitty/Amos Draw (7)..    1969         313         17          12          8          48
   Lincoln Road (10)....    1988         149         50          24         22          22
   Newcastle............    1981         146          5           2          2          17
   Red Desert...........    1979         111         42          18         16          30
   Reno Junction (9)....    1991         --         --          --         --           51
Oklahoma
   Arkoma...............    1985          72          8           6          6         --
   Chaney Dell..........    1966       2,050        180          60         47         198
   Westana..............    1986         799         45          68         58          66
New Mexico
   San Juan River (6)...    1955         140         60          26         20          20
Utah
   Four Corners
    Gathering...........    1988         104         15           3          4          11
                                       -----      -----       -----        ---       -----
     Total..............               8,111      2,282       1,166        915       1,790
                                       =====      =====       =====        ===       =====
</TABLE>

<TABLE>
<CAPTION>
                                                                        Average for
                                                                          the Six
                                                                          Months
                                                                           Ended
                                                                         June 30,
                                                                           1999
                                                                        -----------
                                        Year   Interconnect
                                       Placed      and       Pipeline       Gas
             Storage and                 In    Transmission  Capacity   Throughput
     Transmission Facilities (1)       Service   Miles(2)   (MMcf/D)(2) (MMcf/D)(3)
     ---------------------------       ------- ------------ ----------- -----------
<S>                                    <C>     <C>          <C>         <C>
Katy Facility (11)(14)................  1994       --           --          244
MIGC (12)(15).........................  1970       245          130         159
MGTC (13).............................  1963       252           18          13
                                                   ---          ---         ---
     Total............................             497          148         416
                                                   ===          ===         ===
</TABLE>
Footnotes on following page.

                                       48
<PAGE>

(1)  Our interest in all facilities is 100% except for Midkiff/Benedum (73%);
     Black Lake (69%); Lincoln Road (72%); Westana Gathering Company (50%);
     Newcastle (50%) and Coal Bed Methane Gathering (50%). We operate all
     facilities and all data includes our interests and the interests of other
     joint interest owners and producers of gas volumes dedicated to the
     facility. Unless otherwise indicated, all facilities shown in the table are
     gathering and processing facilities.
(2)  Gas gathering systems miles, interconnect and transmission miles, gas
     storage capacity and pipeline capacity are as of June 30, 1999.
(3)  Gas throughput capacity is as of June 30, 1999 and represents capacity in
     accordance with design specifications unless other constraints exist,
     including permitting or field compression limits.
(4)  Aggregate wellhead natural gas volumes collected by a gathering system,
     aggregate volumes delivered over the header at the Katy Hub and Gas Storage
     Facility or volumes transported by a pipeline.
(5)  Volumes of gas and NGLs are allocated to a facility when a well is
     connected to that facility; volumes exclude NGLs fractionated for third
     parties.
(6)  Sour gas facility (capable of processing or treating gas containing
     hydrogen sulfide and/or carbon dioxide).
(7)  Fractionation facility (capable of fractionating raw NGLs into end-use
     products).
(8)  Straddle plant, or a plant located near a transmission pipeline that
     processes gas dedicated to or gathered by a pipeline company or another
     third party.
(9)  NGL production includes conversion of third-party feedstock to iso-butane.
(10) We and our joint venture partner at the Lincoln Road facility have agreed
     to process such gas at our Granger facility so long as there is available
     capacity at the Granger facility. Accordingly, operations at the Lincoln
     Road facility were temporarily suspended for the period between January
     1999 and June 1999.
(11) Hub and gas storage facility.
(12) MIGC is an interstate pipeline located in Wyoming and is regulated by the
     Federal Energy Regulatory Commission.
(13) MGTC is a public utility located in Wyoming and is regulated by the
     Wyoming Public Service Commission.
(14) This facility was sold in April 1999.
(15) Pipeline capacity represents capacity at the Powder River junction only
     and does not include northern delivery points.
(16) This facility was sold in May 1999.

   Largely as a result of low commodity prices affecting NGL products, we have
reduced our budget for capital expenditures in 1999 from the levels expended in
1997 and 1998. We expect capital expenditures related to existing operations to
be approximately $67.0 million during 1999, consisting of the following: (i)
approximately $39.6 million related to gathering, processing and pipeline
assets, of which $6.3 million is for maintaining existing facilities; (ii)
approximately $24.6 million related to exploration and production activities;
and (iii) approximately $2.8 million for miscellaneous items. Overall, capital
expenditures in the Powder River basin coal bed methane development and in
Southwest Wyoming operations represent 53% and 22%, respectively, of the total
1999 budget. As of June 30, 1999, we had expended $34.3 million, consisting of
the following: (i) $19.9 million for new well connects, system expansions and
asset consolidations; (ii) $2.2 million for maintaining existing facilities;
(iii) $11.7 million for exploration and production activities; and (iv)
$598,000 related to other miscellaneous items.

 Gas Gathering, Processing, Storage and Transportation

   Gas Gathering and Processing. We contract with producers to gather raw
natural gas from individual wells located near our plants or gathering systems.
Once we have executed a contract, we connect wells to gathering lines through
which the natural gas is delivered to a processing plant or treating facility.
At a processing plant, we compress the natural gas, extract raw NGLs and treat
the remaining dry gas to meet pipeline quality specifications. Six of our
processing plants can further separate, or fractionate, the mixed NGL stream
into ethane, propane, normal butane and natural gasoline to obtain a higher
value for the NGLs, and three of our plants are able to process and treat
natural gas containing hydrogen sulfide or other impurities which require
removal prior to transportation. At a treating facility, we treat dry gas,
which does not contain liquids that we can economically extract, by removing
hydrogen sulfide or carbon dioxide to meet pipeline quality specifications.

   We acquire dedicated acreage and natural gas supplies in an effort to
maintain or increase throughput levels to offset natural production declines.
We obtain these natural gas supplies by purchasing existing systems from third
parties, by connecting additional wells, through internally developed projects
or through joint ventures. Historically, while certain individual plants have
experienced declines in dedicated reserves, we have been successful in
connecting additional reserves to more than offset the natural declines. There
has been a reduction in drilling activity, primarily in basins that produce oil
and casinghead gas, from levels that existed in prior years. Overall, the level
of drilling will depend upon, among other factors, the prices for gas and oil,
the

                                       49
<PAGE>

drilling budgets of third-party producers, the energy policy of the federal
government and the availability of foreign oil and gas, none of which are
within our control. We have increased our dedicated estimated reserves from 2.2
Tcf at December 31, 1993 to 3.1 Tcf at December 31, 1998. On average, over this
five-year period, including the reserves associated with our joint ventures and
partnerships and excluding the reserves associated with the facilities sold
during this period, we connected new reserves to our facilities to replace
approximately 165% of throughput over this period. There can be no assurance
that we will continue to be successful in replacing the dedicated reserves
processed at our facilities.

   Substantially all gas flowing through our gathering, processing and treating
facilities is supplied under long-term contracts providing for the purchase,
treating or processing of natural gas for periods ranging from five to twenty
years, using three basic contract types. Approximately 70% of our plant
facilities' gross margins, or revenues at the plants less product purchases,
for the year ended December 31, 1998 resulted from percentage-of-proceeds
agreements in which we are typically responsible for arranging for the
transportation and marketing of the gas and NGLs. We pay producers a specified
percentage of the net proceeds received from the sale of the gas and the NGLs.
This type of contract permits us and the producers to share proportionally in
price changes.

   Approximately 20% of our plant facilities' gross margins for the year ended
December 31, 1998 resulted from contracts that are primarily fee-based whereby
we receive a set fee for each Mcf of gas gathered and/or processed. This type
of contract provides us with a steady revenue stream that is not dependent on
commodity prices, except to the extent that low prices may cause a producer to
curtail production. The proportion of fee-based contracts is expected to
increase as the volumes from the Powder River basin coal bed methane
development and Southwest Wyoming increase. See further discussion in "--
Significant Projects and Dispositions."

   Approximately 10% of our plant facilities' gross margins for the year ended
December 31, 1998 resulted from contracts that combine gathering, compression
or processing fees with "keepwhole" arrangements or wellhead purchases.
Typically, we charge producers a gathering and compression fee based upon
volume. In addition, we retain a predetermined percentage of the NGLs recovered
by the processing facility and keep the producers whole by returning to the
producers at the tailgate of the plant an amount of residue gas equal on a Btu
basis to the natural gas received at the plant inlet. The "keepwhole" component
of the contracts permits us to benefit when the value of the NGLs is greater as
a liquid than as a portion of the residue gas stream. However, we are adversely
affected when the value of the NGLs is lower as a liquid than as a portion of
the residue gas stream.

   Transportation. We own and operate MIGC, an interstate pipeline located in
the Powder River basin in Wyoming, and MGTC, an intrastate pipeline located in
Northeast Wyoming. MIGC charges a FERC approved tariff and is connected to the
Colorado Interstate Gas Pipeline, the Williston Basin Interstate Pipeline, the
Pony Express Pipeline and MGTC. During July 1998, MIGC received approval from
the FERC to increase its pipeline capacity from 90 MMcf per day to 130 MMcf per
day. The first two compressors associated with this expansion began operating
in December 1998 and the third compressor began operating in the first quarter
of 1999. See further discussion in "--Significant Projects and Dispositions."
MGTC provides transportation and gas sales at rates that are subject to the
approval of the Wyoming Public Service Commission.

 Significant Projects and Dispositions

   Our significant projects and dispositions since January 1, 1996 are:

   Coal Bed Methane. We continue to develop our Powder River basin coal bed
methane natural gas gathering system and our coal seam gas reserves in Wyoming.
We have acquired drilling rights on 830,000 gross acres (or 425,000 net acres)
in the vicinity of known coal bed methane production. We and other operators in
the area have established production from wells drilled to depths of 400 to
1,200 feet. Together with our partner, we expect to drill approximately 500
wells in 1999, of which approximately 225 have been

                                       50
<PAGE>

drilled through June 30, 1999, all of which are on locations with proven,
undeveloped reserves. The average drilling, completion and gathering cost for
our coal bed methane wells is approximately $65,000 with proven reserves per
well of approximately 320 MMcf. As deeper wells are drilled, the average cost
per well is expected to increase. Production of coal bed methane from the
Powder River basin has been expanding, and approximately 124 MMcf/D of gas
volumes in the second quarter of 1999 were being produced by several operators
in the area as compared to 61 MMcf/D in January 1998. Approximately 75% of this
production is from acreage equally owned by our partner, Barrett Resources
Corporation, and us. We transport most of the coal bed methane gas through our
MIGC interstate pipeline located in Wyoming, for redelivery to gas markets in
the Rocky Mountain and Midwest regions of the United States.

   Current drilling schedules on federal acreage are being delayed subject to
approval of an Environmental Impact Statement. In addition, the Wyoming
Department of Environmental Quality and the Environmental Protection Agency are
reviewing the water discharge and quality standards in the Powder River basin,
and this review is causing a delay in the issuance of water disposal permits.
We believe that the conditions under which water disposal permits will be
issued will be clarified within approximately 60 days. However, we can make no
assurance that the conditions under which permits are granted will not impact
the level of drilling or the timing of production.

   MIGC transports most of the coal bed methane gas for redelivery to gas
markets in the Rocky Mountain and Midwest regions of the United States. Our
capital budget in this area provides for expenditures of approximately $35.8
million during 1999. This capital budget includes approximately $18.5 million
for drilling costs for our interest in approximately 500 wells, production
equipment and undeveloped acreage, $15.3 million for compression and $2 million
for our investment in the Fort Union Gas Gathering, L.L.C., as described below.
Depending upon future drilling success, we may need to make additional capital
expenditures to continue expansion in this basin. However, because of drilling
and other uncertainties beyond our control, we can make no assurance that we
will incur this level of capital expenditure or that we will make additional
capital expenditures. During the years ended December 31, 1998 and 1997, we had
expended approximately $46.7 million and $32.2 million, respectively, on this
project.

   In October 1997, we sold a 50% undivided interest in our Powder River basin
coal bed methane gas operations to Barrett Resources Corporation. This sale
provided us with a substantial acreage dedication for gathering and compression
services within an area of mutual interest, or AMI, additional man-power
resources to accelerate development in this area and more technical expertise
in exploration and production. The sale involved gathering assets, producing
properties, production equipment and certain undeveloped acreage in this area.
The final adjusted purchase price was $17.9 million, resulting in a pre-tax
gain of $4.7 million, which was recognized in the fourth quarter of 1997.

   The AMI with Barrett encompasses approximately 2.1 million acres in the
Powder River basin coal bed methane development area. Both parties will
continue to develop certain specified areas within the AMI, with Barrett
becoming the operator of the producing wells on July 1, 1999. We have committed
to gather and compress for a fee all gas produced from the jointly-owned
properties within the AMI under a long-term agreement.

   In December 1998, we joined with other industry partners to form Fort Union
Gas Gathering, L.L.C., to build a 106-mile long, 24-inch gathering pipeline and
treater to gather and treat natural gas in the Powder River basin in northeast
Wyoming. We own an approximate 13% equity interest in Fort Union and are the
construction manager and field operator. We expect the new gathering header to
have an initial capacity of approximately 450 MMcf/D of natural gas with
expansion capability. The header will deliver coal bed methane gas to a
treating facility to be constructed by us near Glenrock, Wyoming and will
access interstate pipelines to gas markets in the Rocky Mountain and Midwest
regions of the United States. Construction on this project began in April 1999,
and operations commenced in September 1999. The new gathering header and
treating system is project-financed, and will require a cash investment by us
of approximately $2 million.

                                       51
<PAGE>

   Southwest Wyoming. The United States Geologic Survey estimates that the
Greater Green River basin contains over 120 Tcf of unrecovered natural gas
reserves. Our facilities in Southwest Wyoming are comprised of the Granger
facility and a 72% ownership interest in the Lincoln Road facility,
collectively the "Granger Complex." These facilities have a combined
operational capacity of 225 MMcf/D and processed an average of 177 MMcf/D in
the second quarter of 1999. We believe that as governmental drilling
restrictions affecting a portion of this basin are removed in the fourth
quarter of 1999, we may have the opportunity to expand these facilities in the
year 2000. Our capital budget in this area provides for expenditures of
approximately $14.5 million during 1999. This capital budget includes
approximately $6.1 million for drilling costs and production equipment and
approximately $8.4 million related to gathering, transportation and expansion
of the Granger facility. Because of drilling and other uncertainties beyond our
control, we can provide no assurance that we will incur this level of capital
expenditure or that we will make future capital expenditures. During the years
ended December 31, 1998 and 1997, we expended approximately $16.0 million and
$6.2 million, respectively, on this project.

   In 1997, we entered into an agreement with Ultra Resources, Inc. to
participate in the exploration, development, gathering and processing in the
Hoback Basin in Southwestern Wyoming. Under the agreement, we established a 1.8
million acre AMI, in which Ultra currently controls approximately 350,000
acres. We have the option to participate in exploration and production
activities within the AMI for approximately a 15% working interest. We have
also entered into agreements with Ultra for the gathering and processing of
natural gas, which is developed on 16 prospects within the AMI, through our
Granger facility.

   Additionally, we entered into two separate agreements with RIS Resources
(USA) Inc., an affiliate of Ultra, to sell RIS undivided interests in certain
assets. Under the first agreement, in February 1998, we sold RIS a 50%
undivided interest in a small portion of the Granger gathering system servicing
the Ultra AMI for approximately $4.0 million. This amount approximated our cost
in such facilities. We expect to install jointly with RIS additional gathering
assets in this area as needed. Under the second agreement with RIS, we granted
RIS the option to purchase up to 50% of the Granger Complex. In conjunction
with this agreement, in February 1998, RIS paid a $1 million non-refundable
option payment to us. RIS's option to acquire an interest in these facilities
expired in the fourth quarter of 1998.

   Bethel Treating Facility. In 1996 and 1997, the Pinnacle Reef exploration
area was rapidly developing into a very active lease acquisition and
exploratory drilling area using 3-D seismic technology to identify prospects.
The initial discoveries indicated a very large potential gas development. Based
on our receipt of large acreage dedications in this area, we constructed the
Bethel treating facility for a total cost of approximately $102.8 million with
a throughput capacity of 350 MMcf/D. In 1998, the production rates from the
wells drilled in this field and the recoverable reserves from these properties,
were far less than the producers originally expected. As a result, in 1998, the
Bethel treating facility averaged gas throughput of approximately 61 MMcf/D.
Due to the unexpected poor drilling results and reductions in the producers'
drilling budgets, the number of rigs active in this area has decreased from 18
in July 1998 to one active rig in June 1999.

   Statement of Financial Accounting Standards No. 121, "Accounting for the
Impairment of Long-Lived Assets and for Long-Lived Assets to Be Disposed of,"
requires the review of long-lived assets whenever events or changes in
circumstances indicate that the carrying value of such assets may not be
recoverable. SFAS No. 121 also requires that an impairment loss be recognized
when the carrying amount of an asset exceeds its fair market value or its
expected future undiscounted net cash flows. Because of uncertainties related
to the pace and success of third-party drilling programs, declines in volumes
produced at certain wells and other conditions outside our control, we
determined that such an evaluation of the Bethel treating facility was
necessary. We compared the net book value of the assets to the discounted
expected future cash flows of the facility and determined that the results of
this comparison required a pre-tax, non-cash impairment charge of $77.8 million
in the fourth quarter of 1998.


                                       52
<PAGE>

   Edgewood. In two transactions which closed in October 1998 we sold our
Edgewood gathering system, including our undivided interest in the producing
properties associated with this facility, and our 50% interest in the Redman
Smackover Joint Venture. The combined sales price was $55.8 million. We used
the proceeds from these sales to repay a portion of the balances outstanding
under the Revolving Credit Facility. After the accrual of certain related
expenses, we recognized a pre-tax gain of approximately $1.6 million during the
fourth quarter of 1998.

   Perkins. In November 1997, we entered into an agreement to sell our Perkins
facility. In March 1998, we completed the sale of this facility, with an
effective date of January 1, 1998. The sales price was $22.0 million and
resulted in a pre-tax gain of approximately $14.9 million. We used the proceeds
from this sale to repay a portion of the balances outstanding under the
Revolving Credit Facility.

   Giddings. In April 1999, we sold our Giddings facility for gross proceeds of
$36.0 million, which resulted in an approximate pre-tax loss of $6.6 million in
the second quarter of 1999, subject to final accounting adjustment.

   Katy. We continue to view access to storage capacity as a significant
element of our marketing strategy. However, as a result of an increase in
third-party storage services available in the marketplace combined with our
1999 business plan objective of improving our balance sheet, in April 1999 we
sold all the outstanding common stock of our wholly owned subsidiary, Western
Gas Resources Storage, Inc., for gross proceeds of $100.0 million. This
transaction resulted in an approximate pre-tax loss of $16.6 million, in the
second quarter of 1999, subject to final accounting adjustment. The only asset
of this subsidiary was the Katy facility. In April 1999, we also sold 5.1 Bcf
of stored gas in the Katy facility for total sales proceeds of $11.7 million,
which approximated our cost of the inventory. To meet the needs of our
marketing operations, we will continue to contract for storage capacity.
Accordingly, we entered into a long-term agreement with the purchaser for
approximately 3 Bcf of storage capacity at market rates.

   MiVida. In June 1999, we sold our MiVida treating facility for gross
proceeds of $12.0 million. This transaction is subject to final accounting
adjustment and is expected to result in an approximate pre-tax gain of $1.2
million.

   Other. We routinely review the economic performance of each of our operating
facilities to ensure that a targeted rate of return is achieved. If an
operating facility is not generating targeted returns we will explore various
options, such as consolidation with other Western-owned or third party-owned
facilities, dismantlement, asset swap or outright sale.

 Marketing

   Gas. We market gas produced at our plants and purchased from third parties
to end-users, local distribution companies, or LDCs, pipelines and other
marketing companies throughout the United States and in Canada. Historically,
our gas marketing was an outgrowth of our gas processing activities and was
directed towards selling gas processed at our plants to ensure their efficient
operation. As we expanded into new basins and the natural gas industry became
deregulated and offered more opportunity, we began to increase our third-party
gas marketing. For the six months ended June 30, 1999 and the year ended
December 31, 1998, our gas sales volumes averaged 2.0 Bcf/D and 2.2 Bcf/D,
respectively. Third-party sales and gas storage, combined with the stable
supply of gas from our facilities, enable us to respond quickly to changing
market conditions and to take advantage of seasonal price variations and peak
demand periods. We sell gas under agreements with varying terms and conditions
in order to match seasonal and other changes in demand. Most of our current
sales contracts range from a few days to two years. During 1997, we created a
wholly owned subsidiary to operate a marketing office in Calgary, Alberta. The
Calgary office provides us with information regarding gas supplies being
transported from Canada and establishes a presence in an evolving gas market.


                                       53
<PAGE>

   In general, we do not expect to increase our third-party sales volumes in
1999 significantly from levels achieved during the year ended December 31,
1998. Our 1999 gas marketing plan emphasizes growth through our asset base and
storage and transportation capacities which we control.

   We continue to view access to storage capacity as a significant element of
our marketing strategy. We customarily store gas in underground storage
facilities to ensure an adequate supply for long-term sales contracts and for
resale during periods when prices are favorable. As of December 31, 1998, we
had contracts in place for approximately 16.2 Bcf of storage capacity,
including storage through our Canadian subsidiary, for resale during periods
when prices are favorable. The fees associated with these contracts currently
do not exceed $.61 per Mcf and the associated periods range from two months to
six years. As of December 31, 1998, we also had contracts for approximately 490
MMcf/D of firm transportation; approximately 30% of these contracts expire
during 1999. The fees associated with these contracts do not exceed $.33 per
Mcf, and the associated periods range from seven months to thirteen years.
Certain of these long-term storage and firm transportation contracts require an
annual renewal. In addition, some contracts contain provisions which would
require us to pay the fees associated with these contracts whether or not the
service was used.

   We held gas in storage and in imbalances of approximately 7.5 Bcf at an
average cost of $1.94 per Mcf at June 30, 1999 compared to 18.5 Bcf at an
average cost of $2.10 per Mcf at June 30, 1998, at various storage facilities.
At June 30, 1999, we had hedging contracts in place for anticipated sales of
approximately 6.5 Bcf of stored gas at a weighted average price of $2.26 per
Mcf for the stored inventory. See further discussion in "--Significant Projects
and Dispositions--Katy" and "Management's Discussion and Analysis of Financial
Condition and Results of Operations--Liquidity and Capital Resources--Risk
Management Activities."

   During the year ended December 31, 1998, we sold gas to approximately 475
end-users, pipelines, LDCs and other customers. No single gas customer
accounted for more than 4% of consolidated revenues for the year ended December
31, 1998.

   NGLs. We market NGLs, or ethane, propane, iso-butane, normal butane, natural
gasoline and condensate, produced at our plants and purchased from third
parties, in the Rocky Mountain, Mid-Continent, Gulf Coast and Southwestern
regions of the United States. A majority of our production of NGLs moves to the
Gulf Coast area, which is the largest NGL market in the United States. Through
the development of end-use markets and distribution capabilities, we seek to
ensure that products from our plants move on a reliable basis, avoiding
curtailment of production. For the six months ended June 30, 1999, NGL sales
averaged 2,785 MGal/D.

   Consumers of NGLs are primarily the petrochemical industry, the petroleum
refining industry and the retail and industrial fuel markets. As an example,
the petrochemical industry uses ethane, propane, normal butane and natural
gasoline as feedstocks in the production of ethylene, which is used in the
production of various plastics products. Over the last several years, the
petrochemical industry has increased its use of NGLs as a major feedstock and
is projected to continue to increase such usage. Further, consumers use propane
for home heating, transportation and for agricultural applications. Price,
seasonality and the economy primarily affect the demand for NGLs.

   We increased sales to third parties by approximately 385 MGal/D for the year
ended December 31, 1998 compared to 1997. In general, we do not anticipate that
sales to third parties in 1999 will increase at the rate experienced in prior
years. Our NGL marketing plan contemplates: (i) continued growth in sales to
end-users; (ii) maximizing profitability on volumes produced at our facilities;
and (iii) efficient use of various third-party storage facilities to increase
profitability while limiting carrying risk.

   We lease NGL storage space at major trading locations, primarily near
Houston and in central Kansas, in order to store products for resale during
periods when prices are favorable and to facilitate the distribution of
products. In addition, as of December 31, 1998, we had contracts in place for
approximately 30,450 MGal of storage capacity. The base fees associated with
such contracts currently do not exceed $.03 per gallon and the associated
periods range from three months to four years. Certain of the long-term
contracts require an annual

                                       54
<PAGE>

renewal and contain provisions which would require us to pay the fees
associated with such contracts whether or not the service was used.

   We held NGLs in storage of 8,000 MGal, consisting primarily of propane and
normal butane, at an average cost of $.28 per gallon and 50,000 MGal at an
average cost of $.28 per gallon at June 30, 1999 and 1998, respectively, at
various third-party storage facilities. At June 30, 1999, we had no significant
hedging contracts in place for anticipated sales of stored NGLs.

   NGL sales were made to approximately 175 different customers for the year
ended December 31, 1998. No single customer accounted for more than 2% of our
consolidated revenues for the year ended December 31, 1998. We also derive
revenues from contractual marketing fees charged to some producers for NGL
marketing services. For the year ended December 31, 1998, these fees were less
than 1% of our consolidated revenues.

   Power Marketing. In July 1996, the FERC issued its final order requiring
investor-owned electric utilities to provide open access for wholesale
transmission. This action allowed companies to participate in a market
previously controlled by electric utilities. During 1996 and 1997, we traded
electric power in the wholesale market and entered into transactions that
arbitrage the value of gas and electric power. During the second half of 1997,
we elected to discontinue wholesale trading of electric power, due to a lack of
profitability.

 Producing Properties

   During 1997, we began to invest more capital in oil and gas producing
activities primarily to replace declining reserves which are processed at our
facilities and to encourage expansion in basins where our facilities are
located. See "Business--Significant Projects and Dispositions--Coal Bed
Methane" and "--Southwest Wyoming." We believe that in order to secure
additional gas supply for our facilities, we must be willing to consider
participation in exploration and production activities. At December 31, 1998,
we had an interest in 671 gross wells (or 304 net wells) located primarily in
the Powder River Basin. Revenues derived from our producing properties
comprised approximately 1.3%, 1.3% and 1.6% of consolidated revenues for the
years ended December 31, 1998, 1997 and 1996, respectively.

   The following table provides a summary of the net annual production volumes:

<TABLE>
<CAPTION>
                                            For the Year Ended December 31,
                                       -----------------------------------------
                                           1998          1997          1996
                                       ------------- ------------- -------------
                                        Gas    Oil    Gas    Oil    Gas    Oil
      State                            (MMcf) (MBbl) (MMcf) (MBbl) (MMcf) (MBbl)
      -----                            ------ ------ ------ ------ ------ ------
      <S>                              <C>    <C>    <C>    <C>    <C>    <C>
      Colorado........................    274    2      243    6       73    6
      Louisiana.......................  2,810   75    4,760  108    7,255  117
      Texas (1).......................  1,787    5    6,092   21    7,193   32
      Wyoming:
        Coal Bed Methane..............  7,136  --     1,751  --        12  --
        All Other.....................  3,283   40    1,752   19      233    3
                                       ------  ---   ------  ---   ------  ---
      Total........................... 15,290  122   14,598  154   14,766  158
                                       ======  ===   ======  ===   ======  ===
</TABLE>
- --------
(1) We sold our producing properties in Texas during 1998.

   As a result of a review of the reserves at our Black Lake facility, and by
comparing the net book value of the assets to the undiscounted expected future
cash flows, which management determined by applying future prices estimated
over the lives of the associated reserves, we wrote down the Black Lake
reserves and the processing facility associated with such reserves in
accordance with SFAS No. 121 to the net present value of expected cash flows
discounted using an interest rate commensurate with the risk associated with
the underlying asset. Accordingly, we recognized a pre-tax, non-cash loss of
$28.8 million for the year ended December 31, 1998. In addition, we recognized
a pre-tax, non-cash loss on the impairment of property and

                                       55
<PAGE>

equipment, primarily related to our Black Lake facility and Sand Wash basin
assets, of $34.6 million for the year ended December 31, 1997.

   We employ a total staff of eight full time reservoir and production
engineers and geologists who complete annual reserve estimates of dedicated
reserves behind each of our existing facilities. These engineers also complete
annual reserve estimates of each of our producing areas. The reserve report
prepared internally for the Powder River coal bed methane for 1998 has been
audited by Fairchild, Ancell & Wells, Inc. The reserves associated with the
Black Lake field have been prepared by Williamson Petroleum Consultants, Inc.
since 1996.

   Our reserve estimates are subject to numerous uncertainties inherent in the
estimation of quantities of proved reserves and in the projection of future
rates of production and the timing of development expenditures. The accuracy of
these estimates is a function of the quality of available data and of
engineering and geological interpretation and judgment. Reserve estimates are
imprecise and should be expected to change as additional information becomes
available. Estimates of economically recoverable reserves and of future net
cash flows expected therefrom prepared by different engineers or by the same
engineers at different times may vary substantially. Results of subsequent
drilling, testing and production may cause either upward or downward revisions
of previous estimates. In addition, the estimates of future net revenues from
our proved reserves and the present value of those reserves are based upon
certain assumptions about production levels, prices and costs, which may not be
correct. Further, the volumes considered to be commercially recoverable
fluctuate with changes in prices and operating costs. The meaningfulness of
such estimates is highly dependent upon the accuracy of the assumptions upon
which they were based. Actual results may differ materially from the results
estimated. Our estimates of reserves dedicated to our gathering and processing
facilities are calculated by our reservoir engineering staff and are based on
publicly available data. These estimates may be less reliable than the reserve
estimates made for our own producing properties since the data available for
estimates of our own producing properties also includes our proprietary data.

 Environmental

   The construction and operation of our gathering systems, plants and other
facilities used for the gathering, transporting, processing, treating or
storing of gas and NGLs are subject to federal, state and local environmental
laws and regulations, including those that can impose obligations to clean up
hazardous substances at our facilities or at facilities to which we send wastes
for disposal. In most instances, the applicable regulatory requirements relate
to water and air pollution control or waste management. We employ six
environmental engineers and seven regulatory compliance specialists to monitor
environmental and safety compliance at our facilities. Prior to consummating
any major acquisition, our environmental engineers perform audits on the
facilities to be acquired. In addition, on an ongoing basis, the environmental
engineers perform environmental assessments of our existing facilities. We
believe that we are in substantial compliance with applicable material
environmental laws and regulations. Environmental regulation can increase the
cost of planning, designing, constructing and operating our facilities. We
believe that the costs for compliance with current environmental laws and
regulations have not had and will not have a material effect on our financial
position or results of operations.

   The Texas Natural Resource Conservation Commission which has authority to
regulate, among other things, stationary air emissions sources, has created a
committee to make recommendations to the Commission regarding a voluntary
emissions reduction plan for the permitting of existing "grandfathered" air
emissions sources within the State of Texas. A "grandfathered" air emissions
source is one that does not need a state operating permit because it was
constructed prior to 1971. We operate a number of these sources within the
State of Texas, including portions of our Midkiff plant and many of our
compressors. The recommendations proposed by the committee would create a
voluntary permitting program for grandfathered sources, including incentives to
participate, like the ability to operate in these sources in a flexible manner.
It is not clear which of the committee's recommendations, if any, that the
Commission will implement and it is not possible to assess the potential effect
on us until final regulations are promulgated.


                                       56
<PAGE>

   We anticipate that it is reasonably likely that the trend in environmental
legislation and regulation will continue to be towards stricter standards. We
are unaware of future environmental standards that are reasonably likely to be
adopted that will have a material effect on our financial position or results
of operations, but we cannot rule out that possibility.

   We are in the process of voluntarily cleaning up substances at certain
facilities that we operate. Our expenditures for environmental evaluation and
remediation at existing facilities have not been significant in relation to our
results of operations and totaled approximately $1.4 million for the year ended
December 31, 1998, including approximately $732,000 in air emissions fees to
the states in which we operate, $132,000 of which was attributable to the
Edgewood facility which we sold in October 1998. Although we anticipate that
such environmental expenses per facility will increase over time, we do not
believe that such increases will have a material effect on our financial
position or results of operations.

 Competition

   We compete with other companies in the gathering, processing, treating and
marketing businesses both for supplies of natural gas and for customers for our
natural gas and NGLs. Competition for natural gas supplies is primarily based
on efficiency, reliability, availability of transportation and ability to
obtain a satisfactory price for the producers' natural gas. Competition for
sales customers is primarily based upon reliability and price of deliverable
natural gas and NGLs. Our competitors for obtaining additional gas supplies,
for gathering and processing gas and for marketing gas and NGLs include
national and local gas gatherers, brokers, marketers and distributors of
various sizes, financial resources and experience. For marketing customers that
have the capability of using alternative fuels, such as oil and coal, we also
compete based primarily on price against companies capable of providing such
alternative fuels. We have experienced narrowing margins related to third-party
sales due to the increasing availability of pricing information in the natural
gas industry. Counterparties in our gas marketing transactions may require
additional security such as letters of credit that are not required of certain
of our competitors. If the additional security is required, our marketing
margins and volumes may be adversely impacted.

 Regulation

   Our purchase and sale of natural gas and the fees we receive for gathering
and processing have generally not been subject to regulation and, therefore,
except as constrained by competitive factors, we have considerable pricing
flexibility. However, many aspects of our gathering, processing, marketing and
transportation of natural gas and NGLs are subject to federal, state and local
laws and regulations which can have a significant impact upon our overall
operations.

   As a processor and marketer of natural gas, we depend on the transportation
and storage services offered by various interstate and intrastate pipeline
companies for the delivery and sale of our own gas supplies as well as those we
process and/or market for others. Both the interstate pipelines' performance of
transportation and storage services, and the rates charged for such services,
are subject to the jurisdiction of the FERC under the Natural Gas Act of 1938
and the Natural Gas Policy Act of 1978. At times, other system users can pre-
empt the availability of interstate transportation and storage services
necessary to enable us to make deliveries and/or sales of gas in accordance
with FERC-approved methods for allocating the system capacity of "open access"
pipelines. Moreover, the rates the pipelines charge for such services are often
subject to negotiation between shippers and the pipelines within certain FERC-
established parameters and will periodically vary depending upon individual
system usage and other factors. An inability to obtain transportation and/or
storage services at competitive rates can hinder our processing and marketing
operations and/or adversely affect our sales margins.

   In 1997, the State of Texas adopted a statute that will require us to obtain
a pre-construction permit for certain gas gathering lines containing more than
100 parts per million of hydrogen sulfide and grants affected persons, in
certain circumstances, the right to request a hearing relating to the issuance
of such a permit. This

                                       57
<PAGE>

may increase the time and cost associated with constructing hydrogen sulfide
gathering lines. We operate the Bethel facility in Texas which removes hydrogen
sulfide from the natural gas.

   Generally, neither the FERC nor any state agency regulates gathering and
processing prices. The Oklahoma Corporation Commission, or the OCC, has limited
authority in certain circumstances, after the filing of a complaint by a
producer, to compel a gas gatherer to provide open access gathering and to set
aside unduly discriminatory gathering fees. The Oklahoma state legislature is
considering legislation that would expand the authority of the OCC to compel a
gas gatherer to provide open access gas gathering and to establish rates, terms
and conditions of services which a gas gatherer provides. In addition, the
state legislatures and regulators in other states in which we gather gas are
also contemplating additional regulation of gas gathering. We do not believe
that any of the proposed legislation of which we are aware is likely to have a
material adverse effect on our financial position or results of operation.
However, we cannot predict what additional legislation or regulations the
States may adopt regarding gas gathering.

 Employees

   At June 30, 1999, we employed approximately 772 full-time employees, none of
whom was a union member. We consider relations with employees to be excellent.

 Legal Proceedings

   McMurry Oil Company, et al. v. TBI Exploration, Inc., Mountain Gas
Resources, Inc. and Wildhorse Energy Partners, LLC, District Court, Ninth
Judicial District, Sublette County, Wyoming, Civil Action No. 5882. McMurry Oil
Company and certain other producers (collectively, "McMurry") filed suit
against TBI Exploration, Inc. ("TBI"), Mountain Gas Resources, Inc., our
wholly-owned subsidiary ("Mountain Gas") and Wildhorse Energy Partners, LLC
("Wildhorse"). The central dispute in this case concerns the ownership, nature
and extent of a call on certain gas and the right to match offers for gathering
and/or purchasing gas (collectively the "Preferential Rights"). In November
1998, the court granted summary judgment in favor of McMurry as to the
ownership of the Preferential Rights. In early 1999, McMurry, TBI and Wildhorse
settled their claims and crossclaims and as a result TBI and Wildhorse were
dismissed from the case. Trial on the liability phase of the litigation between
McMurry and Mountain Gas was held in May 1999 and judgment was rendered against
Mountain Gas in June 1999, assessing liability for intentional interference of
business expectancies and opportunities and a finding that such interference
caused McMurry to forego or delay entry into these opportunities and further,
that Mountain Gas' assertion of ownership of Preferential Rights were false and
thereby disparaged McMurry's title and rights. The court ruled that McMurry was
entitled to seek damages against Mountain Gas and that the damages may include
punitive damages. McMurry has submitted damage claims in this matter of
approximately $29 million, not including punitive damages. Mountain Gas has
filed a motion to reconsider the applicability of punitive damages in this
matter. A determination of the extent and amount of damages, including
causation and mitigation, for McMurry's damage claims is set for a jury trial
in January 2000. Mountain Gas believes the damage claims are excessive and
unjustified and will vigorously defend its actions and the damage claims raised
by McMurry in this matter. Under the terms of the court's order, Mountain Gas
is not permitted to file any appeal until the damage claims have been
litigated. Mountain Gas believes it has several grounds for appeal in this
matter. At the present time, it is not possible to express an opinion as to the
final outcome of this litigation or to estimate the final amount of damages, if
any, to be assessed in this matter.

   Berco Resources, Inc. v. Amerada Hess Corporation and Western Gas Resources,
Inc., United States District Court, District of Colorado, Civil Action No. 97-
WM-1332. Berco Resources, Inc. is an independent producer and marketer of
natural gas and alleges that it owns or has the right to produce and sell
natural gas in the Temple/Tioga Area in North Dakota. Berco alleges that
Amerada Hess engaged in unlawful monopolization under Section 2 of the Sherman
Act and Section 7 of the Clayton Act by acquiring natural gas gathering and
producing facilities owned by us. Berco alleges that we, along with Amerada
Hess, have conspired, through the purchase and sale of our facilities in the
Temple/Tioga Area, to create a monopoly affecting an appreciable

                                       58
<PAGE>

amount of interstate commerce in violation of Sections 1 and 2 of the Sherman
Act. Berco seeks an award against Amerada Hess and us of threefold the amount
of damages actually sustained by Berco, in an amount to be determined at trial,
and/or divestiture of the assets which Amerada Hess acquired, for an order
restraining and enjoining us and Amerada Hess from violating the antitrust
laws, and for costs, attorney fees and interest. We believe that we have
meritorious defenses to the claims and are vigorously defending such claims. At
the present time it is not possible to predict the outcome of this litigation
to estimate the amount of potential damages.

   Internal Revenue Service. The Internal Revenue Service has completed its
examination of our tax returns for the years 1990 and 1991 and has proposed
adjustments to taxable income reflected in such tax returns that would shift
the recognition of certain items of income and expense from one year to
another. To the extent taxable income in a prior year is increased by proposed
timing adjustments, taxable income may be reduced by a corresponding amount in
other years. However, we would incur an interest charge as a result of such
adjustments. We currently are protesting certain of these proposed adjustments.
In the opinion of management, any proposed adjustments for the additional
income taxes and interest that may result would not be material. However, it is
reasonably possible that the ultimate resolution could result in an amount
which differs materially from management's estimates.

   Other. We are involved in various other litigation and administrative
proceedings arising in the normal course of business. In the opinion of
management, any liabilities that may result from these claims, will not,
individually or in the aggregate, have a material adverse effect on our
financial position or results of operations.

                                       59
<PAGE>

                                   MANAGEMENT

   Set forth below is certain information as of October 13, 1999 concerning the
directors and officers of Western and its predecessors.

<TABLE>
<CAPTION>
Name                     Age                        Position
- ----                     ---                        --------
<S>                      <C> <C>
Brion G. Wise...........  54 Chairman of the Board (1)
Walter L. Stonehocker...  75 Vice Chairman of the Board (3)
Dean Phillips...........  67 Director (3)(5)
Joseph E. Reid..........  70 Director (2)(4)(5)
Richard B. Robinson.....  51 Director (1)(4)(5)
Bill M. Sanderson.......  69 Director (3)
Ward Sauvage............  74 Director (2)
James A. Senty..........  63 Director (3)(4)(5)
Lanny F. Outlaw.........  63 Chief Executive Officer, President and Director (6)
John C. Walter..........  54 Executive Vice President, General Counsel and Secretary
Edward A. Aabak.........  47 Senior Vice President--Operations
John F. Chandler........  43 Senior Vice President--Marketing and Business
                             Development and Assistant Secretary
Vance S. Blalock........  46 Treasurer and Assistant Secretary
Brian E. Jeffries.......  41 Vice President--Gas Marketing
J. Burton Jones.........  40 Vice President--Business Development
Jeffery E. Jones........  46 Vice President--Production
William J. Krysiak......  39 Vice President--Finance
</TABLE>
- --------
(1) Class One Director; term expires in 1999.
(2) Class Two Director; term expires in 2000.
(3) Class Three Director; term expires in 2001.
(4) Member of the Audit Committee.
(5) Member of the Compensation and Nominating Committee.
(6) Mr. Outlaw was appointed to the Board of Directors on September 10, 1999.
    He will serve in this capacity until the next annual meeting.

   Brion G. Wise, has served as Chairman of the Board since July 1987, Chief
Executive Officer from December 31, 1986 until September 30, 1999, and as
President from 1971 through 1986. Mr. Wise received his Bachelor of Science
Degree in Chemical Engineering from Washington State University.

   Walter L. Stonehocker, has served as Vice Chairman of the Board since July
1992, a director since July 1987, Senior Vice President from January 1985 to
July 1992 and Vice President from 1971 to 1985. In addition, he has been active
as a lobbyist for the oil and gas industry in various western states.

   Dean Phillips, has served as a director since July 1987 and as a member of
the Compensation and Nominating Committee since May 1995. Mr. Phillips has been
engaged in the wholesale and retail distribution of natural gas liquids since
1956. Mr. Phillips also serves as an officer and director of several banking
institutions in Missouri and Illinois.

   Joseph E. Reid, has served as a director since May 1994, a member of the
Audit Committee since May 1995 and as a member of the Compensation and
Nominating Committee since May 1994. Mr. Reid has been involved in the oil and
gas business since 1956, and since 1987 has been an independent oil and gas
consultant. From 1984 to 1986 he served as President and Chief Executive
Officer of Meridian Oil, Inc., from 1982 to 1984 as an independent oil and gas
consultant and from 1978 to 1982 as President and Chief Executive Officer of
Superior Oil Company. Mr. Reid also serves as a director for Riverway Bank and
Cliffs Drilling Co. He received his M.B.A. from the Harvard Graduate School of
Business and his Bachelor of Science Degree from Louisiana State University.

                                       60
<PAGE>

   Richard B. Robinson, has served as a director since July 1987, a member of
the Audit Committee since May 1988 and as a member of the Compensation and
Nominating Committee since September 1993. Mr. Robinson has been a shareholder
of the law firm of Lentz, Evans and King P.C. since 1980. He has also been an
adjunct professor at the University of Denver College of Law since 1980. He has
represented us since 1977 with respect to tax, corporate and partnership law
matters. Mr. Robinson received his Juris Doctor Degree from the University of
Denver and his L.L.M. in Taxation from New York University.

   Bill M. Sanderson, has served as a director since July 1987, President from
December 1986 through March 1996, Chief Operating Officer from May 1986 through
March 1996 and Senior Vice President from 1981 through 1986. Mr. Sanderson
received his Bachelor of Science Degree, cum laude, in Chemical Engineering
from Texas Tech University.

   Ward Sauvage, has served as a director since July 1987. Mr. Sauvage was
engaged in the wholesale and retail distribution of natural gas liquids from
1949 through 1993. He owns certain interests in several banking institutions in
Nebraska and serves as a director of such institutions. Mr. Sauvage is Chairman
of the Board and President of Sauvage Gas Company, a diversified private
investment company formed in 1958.

   James A. Senty, has served as a director since July 1987, a member of the
Audit Committee since May 1988 and as a member of the Compensation and
Nominating Committee since September 1993. Mr. Senty has been engaged in the
wholesale and retail distribution of natural gas liquids since 1960. He has
owned certain banking interests since 1976 and currently serves as Chairman of
the Board and President of Midwest Bottle Gas Co., a company which directly and
through subsidiaries is engaged in the retail and wholesale marketing of
natural gas, natural gas liquids and other related items in several states. He
is a director and Senior Vice President of MNIC Companies, the parent
organization of several insurance companies in Wisconsin.

   Lanny F. Outlaw, was appointed to the Board on September 10, 1999. He has
served as Chief Executive Officer and President since October 1, 1999,
President and Chief Operating Officer from March 1996 to September 1999,
Executive Vice President from September 1994 through March 1996, Vice
President--Business Development and Rocky Mountain Region from October 1993 to
September 1994 and Vice President--Business Development from August 1987 to
October 1993. Mr. Outlaw was employed by Shell Oil Company from 1958 to 1987 in
various management positions within the Exploration and Production Department.
Mr. Outlaw received his Bachelor of Science Degree in Engineering from the
South Dakota School of Mines and Technology.

   John C. Walter, has served as Executive Vice President, General Counsel and
Secretary since September 1994, served as Vice President--General Counsel from
May 1988 to August 1994, Corporate Counsel from May 1986 to April 1988 and Land
Manager from March 1983 to April 1986. Mr. Walter received his Bachelor of Arts
Degree in Economics and Juris Doctor Degree from the University of Colorado.

   Edward A. Aabak, has served as Senior Vice President--Operations, since
September 1997, Vice President--Rocky Mountain and Northern Region from June
1995 to August 1997, Vice President--Rocky Mountain Region from September 1994
to May 1995, and Operations Manager of the Rocky Mountain Region from February
1993 to August 1994. From 1982 to 1992, Mr. Aabak was employed by DEKALB Energy
Company in various management, engineering and operations functions. From 1976
to 1982, Mr. Aabak was employed by Dome Petroleum Limited. Mr. Aabak holds a
Bachelor of Science Degree in Chemical Engineering from the University of
Alberta.

   John F. Chandler, has served as Senior Vice President--Marketing and
Business Development since April 1996, Vice President--Marketing and Pipelines
from September 1993 through March 1996, Manager of Business Development from
January 1991 through August 1993 and from July 1984 through August 1993 in
various positions in engineering and business development. Mr. Chandler
received his Bachelor of Science Degree in Engineering from the South Dakota
School of Mines and Technology.

   Vance S. Blalock, has served as Treasurer since November 1994, Controller of
Systems Development and Acquisitions from January 1993 through November 1994,
as Controller of Operational Accounting from May

                                       61
<PAGE>

1990 through December 1992 and in various other positions in the accounting
area from September 1981 through April 1990. Ms. Blalock received her Bachelor
of Science Degree in Commerce from the University of Louisville and is a
Certified Public Accountant.

   Brian E. Jeffries, has served as Vice President--Gas Marketing since April
1996 and has been employed by Western since November 1992 as Director of
Marketing and Transportation. Mr. Jeffries was employed by United Gas Pipe Line
Company from 1991 to 1992 and for LaSER Marketing Company from 1988 through
1991 in various marketing management positions. Mr. Jeffries received his
Bachelor of Science Degree in Civil Engineering from the University of
Colorado.

   J. Burton Jones, has served as Vice President--Business Development since
September 1997 and has been employed by Western since August 1996 as Director
of Strategic Planning. Mr. Jones was employed by Burlington Resources, Inc.
from July 1988 to August 1996 in various gas supply and business development
positions, most recently as Director, Gas Supply. Mr. Jones received his
Bachelor of Science Degree in Petroleum Engineering from Texas Tech University.

   Jeffery E. Jones, has served as Vice President--Production since October
1993 and has been employed by Western since 1989, previously as Production
Manager. From 1987 to 1989, Mr. Jones was an independent oil and gas
consultant. Mr. Jones received his Bachelor of Science Degree in Psychology
from Colorado College and his Bachelor of Science Degree in Mechanical
Engineering from the University of Colorado.

   William J. Krysiak, has served as Vice President--Finance since September
1993, Corporate Controller from June 1993 to August 1993, Controller--Financial
Accounting from June 1990 to May 1993, Director of Tax Accounting and Reporting
from May 1987 to May 1990 and in various other positions in the accounting area
since August 1985. Mr. Krysiak is the principal financial and accounting
officer of Western. He received his Bachelor of Science Degree in Business
Administration from Colorado State University and is a Certified Public
Accountant.

                       DESCRIPTION OF OTHER INDEBTEDNESS

   Revolving Credit Facility. The Revolving Credit Facility is with a syndicate
of banks and provides for a maximum borrowing commitment of $250 million
consisting of an $83 million 364-day Revolving Credit Facility, or Tranche A,
and a five-year $167 million Revolving Credit Facility, or Tranche B. At June
30, 1999, $31.5 million was outstanding on this facility. The Revolving Credit
Facility bears interest at certain spreads over the Eurodollar rate, or the
greater of the Federal Funds rate or the agent bank's prime rate. We have the
option to determine which rate will be used. We also pay a facility fee on the
commitment. The interest rate spreads and facility fee are adjusted based on
our debt to capitalization ratio and range from .75% to 2.00%. At June 30,
1999, the interest rate payable on the facility was 6.5%. We are required to
maintain a total debt to capitalization ratio of not more than 60% through
December 31, 2000 and of not more than 55% thereafter, and a senior debt to
capitalization ratio of not more than 40% beginning September 30, 1999 through
December 31, 2001 and of not more than 35% thereafter. The agreement also
requires a ratio of EBITDA, excluding certain non-recurring items, to interest
and dividends on preferred stock as of the end of any fiscal quarter, for the
four preceding fiscal quarters, of not less than 1.35 to 1.0 beginning June 30,
1999 and increasing to 3.25 to 1.0 by December 31, 2002. This facility is
guaranteed and secured via a pledge of the stock of certain of our
subsidiaries. We generally utilize excess daily funds to reduce any outstanding
balances on the Revolving Credit Facility and associated interest expense, and
we intend to continue such practice.

                                       62
<PAGE>

   Master Shelf Agreement. In December 1991, we entered into a Master Shelf
agreement with The Prudential Insurance Company of America. Amounts outstanding
under the Master Shelf agreement at June 30, 1999 are as indicated in the
following table (dollars in thousands):

<TABLE>
<CAPTION>
                            Interest
   Issue Date       Amount    Rate    Final Maturity               Principal Payments Due
   ----------       ------  --------  --------------               ----------------------
<S>                <C>      <C>      <C>               <C>
October 27, 1992   $  8,334  7.51%   October 27, 1999  single payment at maturity
October 27, 1992     25,000  7.99%   October 27, 2003  $8,333 on each of October 27, 2001 through 2003
December 27, 1993    25,000  7.23%   December 27, 2003 single payment at maturity
October 27, 1994     25,000  9.05%   October 27, 2001  single payment at maturity
October 27, 1994     25,000  9.24%   October 27, 2004  single payment at maturity
July 28, 1995        50,000  7.61%   July 28, 2007     $10,000 on each of July 28, 2003 through 2007
                   --------
                   $158,334
                   ========
</TABLE>

   In April 1999, effective January 1999, we amended our agreement with
Prudential to reflect the following provisions. We are required to maintain a
current ratio, as defined therein, of at least .9 to 1.0, a minimum tangible
net worth equal to the sum of $300 million plus 50% of consolidated net
earnings earned from January 1, 1999 plus 75% of the net proceeds of any equity
offerings after January 1, 1999, and a total debt to capitalization ratio of
not more than 60% through December 31, 2001 and of not more than 55%
thereafter. A senior debt to capitalization ratio was implemented of 40%
through March 2002 and 35% thereafter. This amendment also requires an EBITDA
to interest ratio of not less than 1.75 to 1.0 increasing to a ratio of not
less than 3.75 to 1.0 by March 31, 2002 and an EBITDA to interest on senior
debt ratio of not less than 1.75 to 1.0 increasing to a ratio of not less than
5.50 to 1.0 by March 31, 2002. EBITDA in these calculations excludes certain
non-recurring items. In addition, we are prohibited from declaring or paying
dividends that in the aggregate exceed the sum of $50 million plus 50% of
consolidated net income earned after June 30, 1995, or minus 100% of a net
loss, plus the aggregate net cash proceeds received after June 30, 1995 from
the sale of any stock. At June 30, 1999, approximately $27.0 million was
available under this limitation. We presently intend to finance the $8.3
million payment due in October 1999 with amounts available under the Revolving
Credit Facility. Borrowings under the Master Shelf agreement are guaranteed and
secured via a pledge of the stock of certain of our subsidiaries.

   In June 1999, we prepaid approximately $33.3 million of notes outstanding
under the Master Shelf agreement with proceeds from the offering of the
subordinated notes.

   1995 Senior Notes. In 1995, we sold $42 million of senior notes, the 1995
senior notes, to a group of insurance companies with an interest rate of 8.16%
per annum. In March 1999, we prepaid $15 million of the principal amount
outstanding on the 1995 Senior notes at par. These payments were financed by a
portion of the $37 million Bridge Loan described below and by amounts available
under the Revolving Credit Facility. The remaining principal amount outstanding
of $27 million is due in a single payment in December 2005. The 1995 Senior
notes are guaranteed and secured via a pledge of the stock of certain of our
subsidiaries. This facility contains covenants similar to the Master Shelf
agreement. In the second quarter of 1999, we posted letters of credit for a
total of approximately $10.8 million for the benefit of the holders of the 1995
Senior notes.

   We are currently paying an annual fee of not more than .65% on the amounts
outstanding on the Master Shelf Agreement and the 1995 senior notes. This fee
will continue until we have received an implied investment grade rating on our
senior secured debt. On the portion of the 1995 Senior notes for which a letter
of credit is posted, this annual fee will not be due.

   1993 Senior Notes. In 1993, we sold $50 million of 7.65% senior notes, the
1993 senior notes, to a group of insurance companies. Scheduled annual
principal payments of $7.1 million on the 1993 Senior notes were made on April
30 of 1997 and 1998. In February 1999, we prepaid $33.5 million of the total
principal

                                       63
<PAGE>

amounts outstanding of $35.6 million at par. These payments were financed by a
portion of the $37 million Bridge Loan. We prepaid the remaining outstanding
principal of $2.1 million in April 1999 with amounts available under the
Revolving Credit Facility.

   In connection with the repayments on the Master Shelf agreement, the 1995
senior notes and the 1993 senior notes, we incurred approximately $1.8 million
of pre-tax yield maintenance and other charges. These charges are reflected as
an extraordinary loss from early extinguishment of long-term debt in the second
quarter of 1999.

   Bridge Loan. In February 1999, in order to finance prepayments of amounts
outstanding on the 1993 and 1995 senior notes, we entered into a Bridge Loan
agreement in the amount of $37 million with our agent bank. This facility was
paid in full in April 1999 with proceeds from the sale of the Katy facility.

   Senior Subordinated Notes. In June 1999, we sold $155.0 million of senior
subordinated notes in a private placement. The subordinated notes bear interest
at 10% and were priced at 99.225% to yield 10.125%. These notes contain
maintenance covenants which include limitations on debt incurrence, restricted
payments, liens and sales of assets. The subordinated notes are unsecured and
are guaranteed on a subordinated basis by certain of Western's subsidiaries. We
anticipate completing an exchange offer for the exchange notes, which will be
registered with the SEC for public trading, in the fourth quarter of 1999.

   Covenant Compliance. Taking into account all the covenants contained in
these agreements, we had approximately $97.0 million of available borrowing
capacity at June 30, 1999. In the second quarter of 1999, we amended our
various financing facilities providing for financial flexibility and covenant
modifications and issued the subordinated notes. These amendments were needed
given the depressed commodity pricing experienced in the industry in general
and the disappointing results we have experienced at our Bethel Treating
facility. We can provide no assurance that further amendments or waivers can be
obtained in the future, if necessary, or that the terms would be favorable to
us. To strengthen our credit ratings and to reduce our overall debt
outstanding, we will continue to dispose of non-strategic assets and
investigate alternative financing sources including the issuance of public
debt, project-financing, joint ventures and operating leases.

                              DESCRIPTION OF NOTES

   You can find the definitions of certain terms used in this description under
the subheading "Certain Definitions." In this description, the word "Western"
refers only to Western Gas Resources, Inc. and not to any of its subsidiaries.

   Western issued the old notes under an indenture among itself, the subsidiary
guarantors and Chase Bank of Texas, National Association, as trustee. The terms
of the old notes and the exchange notes include those stated in the indenture
and those made part of the indenture by reference to the Trust Indenture Act of
1939, as amended. You can find the definitions of terms used in this
description under the subheading "Definitions" below. A copy of the indenture
is filed as an exhibit to the registration statement which includes this
prospectus and is available to you upon request.

   The terms of the exchange notes are identical in all material respects to
the terms of the old notes, except for transfer restrictions relating to the
old notes. Any old notes that remain outstanding after the exchange offer,
together with the exchange notes, will be treated as a single class of
securities under the indenture for voting purposes. When we refer to the term
"note" or "notes" in this "Description of Notes" section, we are referring to
both the old notes and the exchange notes. When we refer to "holders" of the
notes, we are referring to those persons who are the registered holders of the
notes on the books of the registrar appointed under the indenture.

                                       64
<PAGE>

   The following description is a summary of the material provisions of the
indenture. It does not restate that agreement in its entirety. We urge you to
read the indenture because it, and not this description, defines your rights
as holders of the notes.

Brief Description of the Notes and the Subsidiary Guarantees

 The notes:

  . are general unsecured obligations of Western;

  . are limited to $225.0 million aggregate principal amount of which $155.0
    million will be issued in this exchange offering;

  . are subordinated in right of payment to all existing and future Senior
    Debt of Western;

  . are senior in right of payment to any existing and future Indebtedness of
    Western that is by its terms subordinated to these notes; and

  . are unconditionally guaranteed by the Guarantors.

   After the Issue Date, additional amounts of notes up to an aggregate of
$70.0 million may be issued in one or more series from time to time subject to
the limitations under "--Certain Covenants--Incurrence of Indebtedness." The
notes currently issued and any additional notes subsequently issued under the
indenture would be treated as a single class for all purposes under the
indenture, including, without limitation, waivers, amendments, redemptions and
offers to purchase.

 The Subsidiary Guarantees

   The old notes are and the exchange notes will be guaranteed by the
following subsidiaries of Western:

  Lance Oil & Gas Company, Inc.,

  MGTC, Inc.,

  MIGC, Inc.,

  Mountain Gas Resources, Inc.,

  Pinnacle Gas Treating, Inc.,

  Western Gas Resources--Texas, Inc.,

  Western Gas Resources Oklahoma, Inc., and

  Western Gas Wyoming, L.L.C.

   The Subsidiary Guarantees of the notes will be:

  . general unsecured obligations of each Guarantor;

  . subordinated in right of payment to all existing and future Guarantor
    Senior Debt of each Guarantor; and

  . senior in right of payment to any existing and future Indebtedness of
    each Guarantor that is by its terms subordinated to the Subsidiary
    Guarantee.

   At June 30, 1999, Western and the Guarantors had total Senior Debt and
Guarantor Senior Debt of approximately $216.8 million. As indicated above, and
as discussed in detail below under the subheading "--Subordination," payments
on the notes and under the Subsidiary Guarantees will be subordinated to the

                                      65
<PAGE>

payment of Senior Debt and Guarantor Senior Debt, respectively. The indenture
will permit us and the Guarantors to incur additional Senior Debt and Guarantor
Senior Debt in the future.

   As of the date of the indenture, all of our subsidiaries will be "Restricted
Subsidiaries." However, under the circumstances described below under the
subheading "--Certain Covenants--Designation of Restricted and Unrestricted
Subsidiaries," we will be permitted to designate certain of our subsidiaries as
"Unrestricted Subsidiaries." Unrestricted Subsidiaries will not be subject to
many of the restrictive covenants in the indenture. Unrestricted Subsidiaries
will not guarantee these notes.

   Not all of our "Restricted Subsidiaries" will guarantee these notes. In
addition, under certain circumstances the Subsidiary Guarantees may be
released. See "--Subsidiary Guarantees." In the event of a bankruptcy,
liquidation or reorganization of any of these non-guarantor subsidiaries ("non-
Guarantor Subsidiaries"), these non-Guarantor Subsidiaries will pay the holders
of their Indebtedness and preferred stock before they will be able to
distribute any of their assets to us. The non-Guarantor Subsidiaries generated
approximately $342,000 and $336,000 of our EBITDA in 1998 and in the six months
ended June 30, 1999, respectively. To the extent a Subsidiary Guarantee of the
notes is avoided as a result of fraudulent conveyance or held unenforceable for
any other reason, the holders of notes would cease to have any claim in respect
of that Subsidiary Guarantee and would be creditors solely of Western and the
other Guarantors.

Principal, Maturity and Interest

   Western may issue notes with a maximum aggregate principal amount of $225.0
million under the indenture, of which $155.0 million aggregate principal amount
is currently outstanding. Western will issue notes in denominations of $1,000
and integral multiples of $1,000. The notes will mature on June 15, 2009.

   Interest on these notes will accrue at the rate of 10% per annum and will be
payable semi-annually in arrears on June 15 and December 15, commencing on
December 15, 1999. Western will make each interest payment to the holders of
record of these notes on the immediately preceding June 1 and December 1.

   Interest on these notes will accrue from the date of original issuance or,
if interest has already been paid, from the date it has been most recently
paid. Interest will be computed on the basis of a 360-day year comprised of
twelve 30-day months.

Methods of Receiving Payments on the Notes

   If a holder of at least U.S. $1,000,000 aggregate principal amount of the
notes has given wire transfer instructions to Western, we will make all
principal, premium, if any, and interest payments on those notes in accordance
with those instructions. All other payments on these notes will be made at the
office or agency of the Paying Agent and Registrar within the City and State of
New York unless Western elects to make interest payments by check mailed to the
holders at their addresses set forth in the registrar of holders.

Paying Agent and Registrar for the Notes

   The trustee will initially act as Paying Agent and Registrar. Western may
change the Paying Agent or Registrar without prior notice to the holders of the
notes, and Western or any of its Subsidiaries may act as Paying Agent or
Registrar.

Transfer and Exchange

   A holder may transfer or exchange notes in accordance with the indenture.
The Registrar and the trustee may require a holder, among other things, to
furnish appropriate endorsements and transfer documents and Western may require
a holder to pay any taxes and fees required by law or permitted by the
indenture. Western

                                       66
<PAGE>

is not required to transfer or exchange any note selected for redemption. Also,
Western is not required to transfer or exchange any note for a period of 15
days before a selection of notes to be redeemed.

   The registered holder of a note will be treated as the owner of it for all
purposes.

Subsidiary Guarantees

   The Guarantors will jointly and severally guarantee Western's obligations
under these notes. Each guarantee (a "Subsidiary Guarantee") will be
subordinated to the prior payment in full of all Guarantor Senior Debt of that
Guarantor substantially to the same extent as the notes are subordinated to all
existing and future Senior Debt of Western. The obligations of each Guarantor
under its Subsidiary Guarantee will be limited as necessary to prevent that
Subsidiary Guarantee from constituting a fraudulent conveyance under applicable
law. See "Risk Factors--A subsidiary's guarantee of the exchange notes may be
subordinated or avoided as a result of fraudulent conveyance." and "Description
of Notes--Subordination."

   A Guarantor may not sell or otherwise dispose of all or substantially all of
its assets, or consolidate with or merge with or into (whether or not such
Guarantor is the surviving Person) another Person, unless:

  (1) at the time of and immediately after giving effect to that transaction,
      no Default or event of default exists; and

  (2) either:

    (a) the Person acquiring the property in that sale or disposition or
        the Person formed by or surviving that consolidation or merger (if
        other than Western or a Guarantor) assumes all the obligations of
        that Guarantor pursuant to an agreement reasonably satisfactory to
        the trustee; or

    (b) the Net Available Proceeds of that sale or other disposition are
        applied in accordance with the applicable provisions of the
        indenture.

   Notwithstanding the foregoing, any Subsidiary Guarantee of a Guarantor,
whether in existence on the Issue Date or entered into thereafter pursuant to
"--Certain Covenants--Additional Subsidiary Guarantees" or "--Certain
Covenants--Limitations on Issuances of Subsidiary Guarantees of Indebtedness,"
will be released and discharged upon:

  (1) any sale, exchange or transfer of all or substantially all the Capital
      Stock owned by Western or any Restricted Subsidiary in the applicable
      Guarantor to a Person that is not Western or a Restricted Subsidiary,
      if Western applies the Net Available Proceeds of that sale, exchange or
      transfer in accordance with "--Repurchase at Option of holders--Asset
      Disposition,"

  (2) any sale, assignment, conveyance, transfer, lease or other disposition
      of all or substantially all of the properties and assets of such
      Guarantor (including by way of merger or consolidation) to a Person
      that is not Western or a Restricted Subsidiary, if Western applies the
      Net Available Proceeds of that sale, assignment, conveyance, transfer,
      lease or other disposition in accordance with "--Repurchase at Option
      of holders--Asset Disposition,"

  (3) the merger or consolidation of such Guarantor with or into Western or a
      Restricted Subsidiary (provided that in the case of a merger into or
      consolidation with a Restricted Subsidiary that is not then a
      Guarantor, the surviving Restricted Subsidiary assumes the Subsidiary
      Guarantee of such Guarantor and that transaction or series of
      transactions is not prohibited by the indenture),

  (4) the release or discharge of all Guarantees by such Guarantor of all
      Senior Debt of Western, or

  (5) Western's designation of that Guarantor as an Unrestricted Subsidiary
      in accordance with the indenture.

   See "--Repurchase at Option of holders--Asset Disposition."


                                       67
<PAGE>

Subordination

   The payment of principal, premium, if any, and interest on these notes and
any other Obligations with respect to the notes, including but not limited to
any Obligation to repurchase the notes and the Obligation to pay any special
interest due in connection with the exchange offer, will be subordinated to the
prior payment in full in cash of all Senior Debt of Western whether outstanding
on the date of the indenture or subsequently incurred.

   The holders of Senior Debt of Western will be entitled to receive payment in
full in cash of all Obligations due in respect of Western's Senior Debt before
the holders of notes will be entitled to receive any payment with respect to
the notes (except that holders of notes may receive and retain Permitted Junior
Securities and payments made from the trust described under "--Legal Defeasance
and Covenant Defeasance") in the event of any distribution to creditors of
Western:

  (1) in a liquidation or dissolution of Western;

  (2) in a bankruptcy, reorganization, insolvency, receivership or similar
      proceeding relating to Western or its property;

  (3) in an assignment for the benefit of Western's creditors; or

  (4) in any marshalling of Western's assets and liabilities.

   Western also may not make any payment in respect of the notes (except in
Permitted Junior Securities or from the trust described under "--Legal
Defeasance and Covenant Defeasance") if:

  (1) a default in the payment of any Obligations relating to any Designated
      Senior Debt occurs and is continuing beyond any applicable grace
      period; or

  (2) any other default occurs and is continuing on Designated Senior Debt
     that permits (or that would permit, following the passage of time, the
     giving of notice, or both) holders of the Designated Senior Debt as to
     which the default relates to accelerate its maturity and the trustee
     receives a notice of such default (a "Payment Blockage Notice") from
     Western or the Required holders.

   Payments on the notes may and shall be resumed:

  (1) in the case of a payment default on Designated Senior Debt, upon the
      date on which such default is cured or waived; and

  (2) in case of a nonpayment default on Designated Senior Debt, upon the
      earlier of the date on which such nonpayment default is cured or waived
      or 179 days after the date on which the applicable Payment Blockage
      Notice is received, unless the maturity of any Designated Senior Debt
      has been accelerated.

   No new Payment Blockage Notice may be delivered unless and until 360 days
have elapsed since the effectiveness of the immediately prior Payment Blockage
Notice.

   No nonpayment default that existed or was continuing on the date of delivery
of any Payment Blockage Notice to the trustee shall be, or be made, the basis
for a subsequent Payment Blockage Notice unless such default shall have been
cured or waived for a period of not less than 180 days.

   Western must promptly notify the holders of Senior Debt if payment of the
notes is accelerated because of an event of default.

   As a result of the subordination provisions described above, in the event of
a bankruptcy, liquidation or reorganization of Western, holders of these notes
will in all likelihood recover less ratably than creditors of Western who are
holders of Senior Debt. See "Risk Factors--The old notes and the exchange notes
rank behind all of our existing and future indebtedness (other than trade
payables) and any future indebtedness that expressly provides that it is equal
to or senior in right of payment to the old notes and the exchange notes;
payments by a guarantor on its guarantee of the old notes and the exchange
notes are similarly subordinated."

   To the extent the obligation to repay any Senior Debt of the Company or
Guarantor Senior Debt of a Guarantor is declared to be fraudulent, invalid or
otherwise set aside under any bankruptcy, insolvency,

                                       68
<PAGE>

receivership, fraudulent transfer, or similar law, then the obligation so
declared fraudulent or invalid or otherwise set aside (and all other amounts
that would have come due with respect thereto had such obligation not been so
affected) shall be deemed to be reinstated and outstanding as Senior Debt of
the Company or Guarantor Senior Debt of such Guarantor, as applicable, as if
such declaration, invalidity, or setting aside had not occurred.

Optional Redemption

   Prior to June 15, 2002, Western may on any one or more occasions redeem up
to 35% of the aggregate principal amount of notes originally issued under the
indenture at a redemption price of 110% of the principal amount thereof, plus
accrued and unpaid interest to the redemption date, with the net cash proceeds
of one or more Public Equity Offerings; provided that

  (1) at least 65% of the aggregate principal amount of notes originally
      issued remains outstanding immediately after the occurrence of such
      redemption (excluding notes held by Western and its Subsidiaries); and

  (2) the redemption must occur within 90 days after Western's receipt of the
      net cash proceeds of a Public Equity Offering.

   Except pursuant to the preceding paragraph, the notes will not be redeemable
at Western's option prior to June 15, 2004.

   Beginning on or after June 15, 2004, Western, at its option, may redeem all
or a part of these notes upon not less than 30 or more than 60 days' notice at
the redemption prices (expressed as percentages of principal amount) set forth
below plus accrued and unpaid interest thereon, if any, to the applicable
redemption date, if redeemed during the twelve-month period beginning on June
15 of the years indicated below:

<TABLE>
<CAPTION>
             Year                           Percentage
             ----                           ----------
             <S>                            <C>
             2004..........................  105.00%
             2005..........................  103.75%
             2006..........................  102.50%
             2007..........................  101.25%
             2008 and thereafter...........  100.00%
</TABLE>

Western's Senior Debt Agreements restrict Western's ability to optionally
redeem the notes. See "Description of Other Indebtedness."

Mandatory Redemption

   Except as set forth below under "Repurchase at Option of holders," Western
is not required to make mandatory redemption or sinking fund payments with
respect to the notes.

Repurchase at Option of holders

 Change of Control

   If a Change of Control occurs, each holder of notes will have the right to
require Western to repurchase all or any part (equal to $1,000 or an integral
multiple thereof) of that holder's notes pursuant to the Change of Control
Offer. In the Change of Control Offer, Western will offer a Change of Control
Payment in cash equal to 101% of the aggregate principal amount of notes
repurchased plus accrued and unpaid interest thereon, if any, to the date of
purchase. Within 30 days following any Change of Control, Western will mail a
notice to each holder describing the transaction or transactions that
constitute the Change of Control and offering to repurchase notes on the Change
of Control Payment Date specified in such notice, pursuant to the procedures
required by the indenture and described in such notice. Western will comply
with the requirements of Rule

                                       69
<PAGE>

14e-1 under the Exchange Act and any other securities laws and regulations
thereunder to the extent such laws and regulations are applicable in connection
with the repurchase of the notes as a result of a Change of Control. To the
extent that the provisions of any securities laws or regulations with respect
to the procedural requirements for tender offers conflict with the Change of
Control provisions of the indenture, Western will comply with the applicable
securities laws and regulations with respect to those procedural requirements
and will not be deemed to have breached its obligations under the Change of
Control provisions of the indenture by virtue of such conflict.

   On the Change of Control Payment Date, Western will, to the extent lawful:

  (1) accept for payment all notes or portions thereof properly tendered
      pursuant to the Change of Control Offer;

  (2) deposit with the Paying Agent an amount equal to the Change of Control
      Payment in respect of all notes or portions thereof so tendered; and

  (3) deliver or cause to be delivered to the trustee the notes so accepted
      together with an Officers' Certificate stating the aggregate principal
      amount of notes or portions thereof being purchased by Western.

   The Paying Agent will promptly mail to each holder of notes so tendered the
Change of Control Payment for such notes, and the trustee will promptly
authenticate and mail (or cause to be transferred by book entry) to each holder
a new note equal in principal amount to any unpurchased portion of the notes
surrendered, if any; provided that each such new note will be in a principal
amount of $1,000 or an integral multiple thereof.

   The provisions described above that require Western to make a Change of
Control Offer following a Change of Control will be applicable regardless of
whether or not any other provisions of the indenture are applicable. Except as
described above with respect to a Change of Control, the indenture does not
contain provisions that permit the holders of the notes to require that Western
repurchase or redeem the notes in the event of a takeover, recapitalization or
similar transaction. As a result, the provisions of the indenture would not
necessarily afford holders of the notes protection in the event of a highly
leveraged transaction, reorganization, restructuring, merger or similar
transaction involving Western that may adversely affect such holders.

   Western's Senior Debt Agreements currently prohibit Western from purchasing
any notes and also provide that certain Change of Control events with respect
to Western would constitute a default under the Senior Debt Agreements. Any
future credit agreements or other agreements relating to Senior Debt to which
Western becomes a party may contain similar restrictions and provisions. In the
event a Change of Control occurs at a time when Western is prohibited from
purchasing notes, Western could seek to obtain the consent of its senior
lenders to the purchase of notes or could attempt to refinance the borrowings
that contain such prohibition. If Western does not obtain such a consent or
repay such borrowings, Western will remain prohibited from purchasing notes. In
such case, Western's failure to purchase tendered notes would constitute an
event of default under the indenture which would, in turn, constitute a default
under such Senior Debt. In such circumstances, the subordination provisions in
the indenture would likely restrict payments to the holders of notes.

   Western will not be required to make a Change of Control Offer upon a Change
of Control if a third party makes the Change of Control Offer in the manner, at
the times and otherwise in compliance with the requirements set forth in the
indenture applicable to a Change of Control Offer made by Western and purchases
all notes validly tendered and not withdrawn under such Change of Control
Offer.

   The definition of Change of Control includes a phrase relating to the sale,
lease, transfer, conveyance or other disposition of "all or substantially all"
of the assets of Western and its Subsidiaries taken as a whole. Although there
is a limited body of case law interpreting the phrase "substantially all,"
there is no precise established definition of the phrase under applicable law.
Accordingly, the ability of a holder of notes to require

                                       70
<PAGE>

Western to repurchase such notes as a result of a sale, lease, transfer,
conveyance or other disposition of less than all of the assets of Western and
its Subsidiaries taken as a whole to another Person or group may be uncertain.

 Asset Disposition

   Western will not, and will not permit any of its Restricted Subsidiaries to,
consummate an Asset Disposition unless:

  (1) Western (or the Restricted Subsidiary, as the case may be) receives
      consideration at the time of such Asset Disposition at least equal to
      the fair market value of the assets or Capital Stock issued or sold or
      otherwise disposed of;

  (2) such fair market value is determined by Western's Board of Directors
      and evidenced by a resolution of the Board of Directors set forth in an
      Officers' Certificate delivered to the trustee; and

  (3) at least 75% of the consideration therefor received by Western or such
      Restricted Subsidiary is in the form of cash or Cash Equivalents. For
      purposes of this provision, each of the following shall be deemed to be
      cash:

    (a) any liabilities (as shown on Western's or such Restricted
        Subsidiary's most recent balance sheet or in the notes thereto) of
        Western or any Restricted Subsidiary (other than contingent
        liabilities and liabilities that are by their terms subordinated to
        the notes or any Subsidiary Guarantee) that are assumed by the
        transferee of any such assets pursuant to a customary novation
        agreement that releases Western or such Restricted Subsidiary from
        further liability; and

    (b) any securities, notes or other obligations received by Western or
        any such Restricted Subsidiary from such transferee that are
        converted by Western or such Restricted Subsidiary into cash or
        Cash Equivalents within 120 days of the consummation of such Asset
        Sale (to the extent of the cash or Cash Equivalents received in
        that conversion).

   Within 365 days of the receipt of any Net Available Proceeds from an Asset
Disposition, Western may apply such Net Available Proceeds at its option:

  (1) to repay Obligations relating to Indebtedness of Western or any
      Restricted Subsidiary, other then Indebtedness which is subordinated to
      the notes or to the Restricted Subsidiary's Subsidiary Guarantee, as
      applicable;

  (2) to invest in the Capital Stock of any Person primarily engaged in the
      Principal Business if such investment would be a Permitted Business
      Investment or if, as a result of such acquisition, such Person becomes
      a Restricted Subsidiary;

  (3) to make a capital expenditure for the Principal Business; or

  (4) to acquire other long-term assets that are used or useful in the
      Principal Business.

   Any Net Available Proceeds from an Asset Disposition that are not applied or
invested as provided in the preceding paragraph will constitute Excess
Proceeds. As soon as practical, after any date (an "Asset Disposition Trigger
Date") that the aggregate amount of Excess Proceeds exceeds $10.0 million,
Western will make an Asset Sale Offer to all holders of notes and all holders
of other Indebtedness that is pari passu with the notes containing provisions
similar to those set forth in the indenture with respect to offers to purchase
or redeem with the proceeds of sales of assets to purchase the maximum
principal amount of notes and such other pari passu Indebtedness that may be
purchased out of the Excess Proceeds. The offer price in any Asset Disposition
Offer will be equal to 100% of principal amount plus accrued and unpaid
interest, if any, to the date of purchase, and will be payable in cash. If any
Excess Proceeds remain after consummation of an Asset Disposition Offer,
Western may use such Excess Proceeds for any purpose not otherwise prohibited
by the indenture. If the aggregate principal amount of notes and such other
pari passu Indebtedness tendered into such Asset Disposition Offer exceeds the
amount of Excess Proceeds, the trustee shall select the notes and such

                                       71
<PAGE>

other pari passu Indebtedness to be purchased on a pro rata basis. Upon
completion of each Asset Disposition Offer, the amount of Excess Proceeds shall
be reset at zero. The Senior Debt Agreements may prohibit the use of Excess
Proceeds to repurchase the notes.

Selection and Notice

   If less than all of the notes are to be redeemed at any time, the trustee
will select notes for redemption as follows:

  (1) if the notes are listed, in compliance with the requirements of the
      principal national securities exchange on which the notes are listed;
      or

  (2) if the notes are not so listed, on a pro rata basis, by lot or by such
      method as the trustee shall deem fair and appropriate.

   No notes of $1,000 or less shall be redeemed in part. Notices of redemption
shall be mailed by first class mail at least 30, but not more than 60 days,
before the redemption date to each holder of notes to be redeemed at its
registered address. Notices of redemption may not be conditional.

   If any note is to be redeemed in part only, the notice of redemption that
relates to that note shall state the portion of the principal amount thereof to
be redeemed. A new note in principal amount equal to the unredeemed portion of
the original note will be issued in the name of the holder thereof upon
cancellation of the original note. Notes called for redemption become due on
the date fixed for redemption. On and after the redemption date, interest
ceases to accrue on notes or portions of them called for redemption.

Certain Covenants

 Restricted Payments

   Western will not, and will not permit any of its Restricted Subsidiaries to,
directly or indirectly:

  (1) declare or pay any dividend, either in cash or in property (except
      dividends payable in Capital Stock of Western, other than Disqualified
      Stock, or options, warrants or other rights to purchase Capital Stock
      of Western, other than Disqualified Stock), on, or make any other
      payment or distribution on account of, Western's or any of its
      Restricted Subsidiaries' Capital Stock, other than dividends, payments
      or distributions payable to Western or a Wholly Owned Restricted
      Subsidiary of Western;

  (2) purchase, redeem, retire, defease or otherwise acquire for value any of
      its Capital Stock, now or hereafter outstanding (other than in exchange
      for Western's Capital Stock (other than Disqualified Stock) or options,
      warrants or other rights to purchase Western's Capital Stock (other
      than Disqualified Stock));

  (3) make any payment on or with respect to, or purchase, redeem, defease or
      otherwise acquire or retire for value (collectively a "prepayment") any
      Indebtedness of Western (other than the notes) which is subordinate in
      right of payment to the notes prior to the scheduled maturity or on or
      prior to any scheduled repayment of principal (and premium, if any) or
      sinking fund payment, except out of Excess Proceeds in the case of an
      Asset Disposition Offer; or

  (4) make any Restricted Investment

(all such payments and other actions set forth in clauses (1) through (4) above
being collectively referred to as "Restricted Payments"), unless, at the time
of and after giving effect to such Restricted Payment:

  (1) no Default of event of default shall have occurred and be continuing or
      would occur as a consequence thereof;

  (2) Western would be permitted to incur at least $1.00 of additional
      Indebtedness pursuant to the Consolidated Operating Cash Flow Ratio
      test set forth in the first paragraph of the covenant described below
      under the caption "--Incurrence of Indebtedness"; and

                                       72
<PAGE>

  (3) such Restricted Payment, together with the aggregate amount of all
      other Restricted Payments made by Western and its Restricted
      Subsidiaries after the date of the indenture (including Restricted
      Payments permitted by clauses (1) and (5) of the next succeeding
      paragraph and excluding the other Restricted Payments permitted by such
      paragraph and including Restricted Payments permitted by the second
      succeeding paragraph), is less than the sum, without duplication, of

    (a) 50% of the aggregate Consolidated Net Operating Income of Western
        for the period (taken as one accounting period) from the first day
        of the fiscal quarter commencing after the Issue Date to the end of
        Western's most recently ended fiscal quarter for which internal
        financial statements are available at the time of such Restricted
        Payment (or, if such Consolidated Net Operating Income for such
        period is a deficit, less 100% of such deficit), plus

    (b) 100% of the aggregate net cash proceeds received by Western from
        the issue or sale of Capital Stock of Western (other than
        Disqualified Stock) or from the issue or sale of any options,
        warrants or rights to purchase shares of Capital Stock of Western
        (other than Disqualified Stock) or from the issue or sale of shares
        of convertible or exchangeable Disqualified Stock or convertible or
        exchangeable debt securities that have been converted into or
        exchanged for such Capital Stock (other than Capital Stock (or
        Disqualified Stock or debt securities) sold to a Subsidiary of
        Western), plus

    (c) to the extent not otherwise included in Western's Consolidated Net
        Operating Income, if any Restricted Investment that was made after
        the Issue Date is sold for cash or otherwise liquidated or repaid
        for cash, the lesser of (i) the cash return of capital with respect
        to such Restricted Investment (less the cost of disposition, if
        any) and (ii) the initial amount of such Restricted Investment,
        plus

    (d) to the extent not otherwise included in Western's Consolidated Net
        Operating Income, the net reduction in Investments in Unrestricted
        Subsidiaries resulting from repayments of loans or advances to
        Western or a Restricted Subsidiary after the date of the indenture
        from any Unrestricted Subsidiary or from the redesignation of an
        Unrestricted Subsidiary as a Restricted Subsidiary (valued in each
        case as provided in the definition of "Investment"), not to exceed
        in the case of any Unrestricted Subsidiary the total amount of
        Investments (other than Permitted Investments) in such Unrestricted
        Subsidiary made by Western and its Restricted Subsidiaries in such
        Unrestricted Subsidiary after the date of the indenture.

   For purposes of any calculation pursuant to the proceeding sentence which is
required to be made within 60 days after the declaration of a dividend by
Western, such dividend shall be deemed to be paid at the date of declaration.

   So long as no Default has occurred and is continuing or would be caused
thereby, the preceding provisions will not prohibit:

  (1) the payment of any dividend within 60 days after the date of
      declaration thereof, if at the date of declaration such payment would
      have complied with the provisions of the indenture;

  (2) the redemption, repurchase, retirement, defeasance or other acquisition
      of any subordinated Indebtedness of Western or any Restricted
      Subsidiary of Western or of shares of Capital Stock of Western or any
      Restricted Subsidiary of Western in exchange for, or out of the net
      cash proceeds of the substantially concurrent sale (other than to a
      Subsidiary of Western) of, shares of Western's Capital Stock (other
      than Disqualified Stock) or options, warrants or other rights to
      purchase Western's Capital Stock (other than Disqualified Stock);

  (3) other Restricted Payments in an aggregate amount not to exceed $20.0
      million;

  (4) the redemption, repurchase, retirement, defeasance or other acquisition
      of subordinated Indebtedness of Western or any Restricted Subsidiary of
      Western (other than Disqualified Stock) with the net cash proceeds from
      an incurrence of Permitted Refinancing Indebtedness;


                                       73
<PAGE>

  (5) the payment of any dividend by a Restricted Subsidiary of Western to
      the holders of all of its Capital Stock on a pro rata basis; and

  (6) the redemption, repurchase, retirement, defeasance or other acquisition
      of any Disqualified Stock of Western or any Restricted Subsidiary in
      exchange for, or out of the substantially concurrent sale (other than
      to Western or a Subsidiary of Western) of Disqualified Stock of Western
      or such Restricted Subsidiary, respectively; provided that: (A) the
      aggregate liquidation preference of such Disqualified Stock does not
      exceed the aggregate liquidation preference of the Disqualified Stock
      so extended, refinanced, renewed, replaced, defeased or refunded; and
      (B) such Disqualified Stock has a final maturity date later than the
      final maturity date of, and has a Weighted Average Life to Maturity
      equal to or greater than the Weighted Average Life to Maturity of, the
      Disqualified Stock so extended, refinanced, renewed, replaced, defeased
      or refunded.

   In addition, the provisions in the first paragraph of this covenant will not
prohibit the declaration and payment of dividends to holders of Western's
issued and outstanding $2.28 Cumulative Preferred Stock and $2.625 Cumulative
Convertible Preferred Stock or any other class or series of preferred stock of
Western issued in exchange for or to refinance the $2.28 Cumulative Preferred
Stock or $2.625 Cumulative Convertible Preferred Stock; provided that such new
class or series of preferred stock has a dividend rate that is the same as or
less than the dividend rate on the $2.28 Cumulative Preferred Stock and the
$2.625 Cumulative Convertible Preferred Stock, so exchanged or refinanced.

   The amount of all Restricted Payments (other than cash) shall be the fair
market value on the date of the Restricted Payment of the asset(s) or
securities proposed to be transferred or issued by Western or such Restricted
Subsidiary, as the case may be, pursuant to the Restricted Payment. The fair
market value of any assets or securities that are required to be valued by this
covenant shall be determined in the good faith judgment of the Board of
Directors of Western whose resolution with respect thereto shall be delivered
to the trustee. Not later than ten days after the date of making any Restricted
Payment, Western shall deliver to the trustee an Officers' Certificate stating
that such Restricted Payment is permitted and setting forth the basis upon
which the calculations required by this "Restricted Payments" covenant were
computed.

 Incurrence of Indebtedness

   Western will not, and will not permit any of its Restricted Subsidiaries to,
directly or indirectly, create, incur, issue, assume, guarantee or otherwise
become directly or indirectly liable, contingently or otherwise, with respect
to (collectively, "incur") any Indebtedness (including Acquired Debt) other
than (1) Indebtedness represented by the notes to be issued on the date of the
indenture and Indebtedness represented by the exchange notes to be issued
pursuant to the exchange and registration rights agreement and (2) Permitted
Indebtedness unless, after giving effect to the incurrence of such Indebtedness
and the receipt and applications of the proceeds therefrom, Western's
Consolidated Operating Cash Flow Ratio is greater than 2.0 to 1 with respect to
calculations made on or before June 30, 2001 and greater than 2.25 to 1 with
respect to calculations made after June 30, 2001. Western will not permit any
Unrestricted Subsidiary to incur any Indebtedness other than Non-Recourse Debt;
provided, however, that if any such Indebtedness ceases to be Non-Recourse Debt
of an Unrestricted Subsidiary, such event shall be deemed to constitute an
incurrence of Indebtedness by Western.

   So long as no Default shall have occurred and be continuing or would be
caused thereby, the first paragraph of this covenant will not prohibit the
incurrence of any of the following items of Indebtedness (collectively,
"Permitted Indebtedness"):

  (1) Indebtedness under the Credit Facilities (including, without
      limitation, Indebtedness under the Revolving Credit Facility) in an
      aggregate principal amount at any one time outstanding under this
      clause (1) (with letters of credit being deemed to have a principal
      amount equal to the maximum potential liability of Western and its
      Restricted Subsidiaries thereunder) not to exceed an amount equal to
      $250.0 million;


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  (2)  Permitted Refinancing Indebtedness incurred in exchange for, or the net
       proceeds of which are used to refinance, extend, renew, replace,
       defease or refund, Indebtedness that was permitted by the indenture to
       be incurred (pursuant to clauses (3) through (11) below or previously
       incurred pursuant to this clause (2));

  (3)  the Existing Indebtedness (excluding Indebtedness under the Revolving
       Credit Facility);

  (4)  between or among Western and/or its Restricted Subsidiaries;

  (5)  arising out of Sale/Leaseback Transactions or Capitalized Lease
       Obligations, mortgage financings or purchase money obligations, in each
       case, incurred for the purpose of financing all or any part of the
       purchase price or cost of construction or improvement of property,
       plant or equipment used in the business of Western or such Restricted
       Subsidiary of Western (whether through the direct purchase of assets or
       the Capital Stock of any Person owning such assets), in an aggregate
       amount or accreted value, if applicable, not to exceed $15.0 million at
       any time outstanding;

  (6)  arising out of Hedging Obligations; provided, however, that such
       obligations are incurred in the ordinary course of business and not for
       speculative purposes;

  (7)  in-kind obligations relating to net gas balancing positions arising in
       the ordinary course of business;

  (8)  any Guarantee by Western or any of its Restricted Subsidiaries of
       Indebtedness so long as the incurrence of such Indebtedness is
       permitted to be incurred by Western or any of its Restricted
       Subsidiaries under this indenture;

  (9)  Indebtedness incurred in respect of workers' compensation claims, self
       insurance obligations, performance, surety and similar bonds, including
       guarantees and letters of credit supporting such performance, surety
       and similar bonds, provided by Western or a Restricted Subsidiary in
       the ordinary course of business (in each case other than for an
       obligation for money borrowed);

  (10) Indebtedness arising from any agreements of Western or a Restricted
       Subsidiary of Western providing for indemnification, adjustment of
       purchase price or similar obligations, in each case, incurred or
       assumed in connection with the disposition of any business, assets or
       Capital Stock of a Subsidiary; provided that the maximum aggregate
       liability in respect of all such Indebtedness shall at no time exceed
       the gross proceeds (including non-cash proceeds) actually received by
       Western and/or such Restricted Subsidiary in connection with such
       disposition; and

  (11) in addition to Indebtedness permitted by clauses (1) through (10)
       above, Indebtedness not to exceed on a consolidated basis for Western
       and its Restricted Subsidiaries at any time $25.0 million.

   For purposes of determining compliance with this "--Incurrence of
Indebtedness" covenant, in the event that an item of proposed Indebtedness
meets the criteria of more than one of the categories of Permitted Indebtedness
described in clauses (1) through (11) above, or is entitled to be incurred
pursuant to the first paragraph of this covenant, Western will be permitted to
classify such item of Indebtedness on the date of its incurrence in any manner
that complies with this covenant, and such item of Indebtedness will be treated
as having been incurred pursuant to only one of such clauses or pursuant to the
first paragraph of this covenant.

   Other than the limitations on incurrence of Indebtedness contained in this
covenant, there are no provisions in the indenture that would protect the
holders of notes in the event of a highly leveraged transaction.

 No Layering of Indebtedness

   Western will not incur, create, issue, assume, guarantee or otherwise become
liable for any Indebtedness that is subordinate or junior in right of payment
to any Senior Debt of Western and senior in any respect in right of payment to
the notes. No Guarantor will incur, create, issue, assume, guarantee or
otherwise become liable for any Indebtedness that is subordinate or junior in
right of payment to any Guarantor Senior Debt of such Guarantor and senior in
any respect in right of payment to such Guarantor's Subsidiary Guarantee.

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 Liens

   Western will not, and will not permit any of its Restricted Subsidiaries to,
directly or indirectly, create, incur, assume or suffer to exist any Lien
(other than Permitted Liens) on any asset now owned or hereafter acquired, or
on any income or profits therefrom, or assign or convey any right to receive
income therefrom to secure (a) any Indebtedness of Western, unless the notes
are secured equally and ratably simultaneously with or prior to the creation,
incurrence or assumption of such Lien for so long as such Lien exists or (b)
any Indebtedness of any Guarantor, unless the Subsidiary Guarantee of such
Guarantor is secured equally and ratably simultaneously with or prior to the
creation, incurrence or assumption of such Lien for so long as such Lien
exists; provided, that in any case involving a Lien securing Indebtedness which
is subordinated in right of payment to the notes or the Subsidiary Guarantees,
as the case may be, such Lien is subordinated to the Lien securing the notes or
the Subsidiary Guarantees to the same extent that such subordinated debt is
subordinated to the notes or the Subsidiary Guarantees.

 Dividend and Other Payment Restrictions Affecting Subsidiaries

   Western will not, and will not permit any of its Restricted Subsidiaries to,
directly or indirectly, create or permit to exist or become effective any
consensual encumbrance or restriction on the ability of any Restricted
Subsidiary to:

  (1) pay dividends, in cash or otherwise, or make any other distributions on
      its Capital Stock to Western or any of Western's Restricted
      Subsidiaries or pay any Indebtedness owed to Western or any of
      Western's Restricted Subsidiaries;

  (2) make loans or advances to Western or any of Western's Restricted
      Subsidiaries; or

  (3) transfer any of its properties or assets to Western or any of Western's
      Restricted Subsidiaries.

   However, the preceding restrictions will not apply to encumbrances or
restrictions existing under or by reason of:

   (1) any agreement or other instrument as in effect on the date of the
       indenture and any amendments, modifications, restatements, renewals,
       increases, supplements, refundings, replacements or refinancings
       thereof, provided that such amendments, modifications, restatements,
       renewals, increases, supplements, refundings, replacement or
       refinancings are no more restrictive, taken as a whole, in any
       material respect with respect to such dividend and other payment
       restrictions than those contained in such agreements or instruments as
       in effect on the date of the indenture, all as determined in the good
       faith judgment of the Board of Directors;

   (2) the indenture and the notes;

   (3) applicable laws, rules, regulations and/or orders;

   (4) any agreement or other instrument of a Person acquired by Western or
       any of its Restricted Subsidiaries as in effect at the time of such
       acquisition (except to the extent entered into or created in
       connection with or in contemplation of such acquisition), which
       encumbrance or restriction is not applicable to any other Person, or
       the properties or assets of any other Person, other than the Person,
       or the property or assets of the Person, so acquired;

   (5) customary non-assignment provisions in leases entered into in the
       ordinary course of business and consistent with past practices;

   (6) pursuant to Capitalized Lease Obligations and purchase money
       obligations for property leased or acquired in the ordinary course of
       business that impose restrictions on the property so acquired in the
       nature described in clause (3) of the preceding paragraph;

   (7) Permitted Refinancing Indebtedness, provided that the restrictions
       contained in the agreements governing such Permitted Refinancing
       Indebtedness are no more restrictive, taken as a whole, in any
       material respect than those contained in the agreements governing the
       Indebtedness being refinanced as determined in the good faith judgment
       of the Board of Directors;

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   (8) Liens, securing Indebtedness, otherwise permitted to be created or
       incurred pursuant to the provisions of the covenant described above
       under the caption "--Liens" that limit the right of Western or any of
       its Restricted Subsidiaries to dispose of or transfer the assets
       subject to such Lien;

   (9) pursuant to any merger agreements, stock purchase agreements, asset
       sale agreements and similar agreements limiting the transfer of
       properties and assets or distributions pending consummation of the
       subject transaction;

  (10) pursuant to agreements among holders of Capital Stock of any
       Restricted Subsidiary of Western requiring distributions in respect of
       such Capital Stock to be made pro rata based on the percentage of
       ownership in and/or contribution to such Restricted Subsidiary;

  (11) in the case of clause (3) of the first paragraph of this covenant, any
       encumbrance or restriction (a) that restricts in a customary manner
       the subletting, assignment or transfer of any property or asset that
       is subject to a lease, license, or similar contract or (b) by virtue
       of any transfer of, agreement to transfer, option or right with
       respect to, or Lien on, any property or assets of Western or any of
       its Subsidiaries not otherwise prohibited by the indenture; and

  (12) other Indebtedness of Restricted Subsidiaries permitted to be incurred
       pursuant to the provisions of the covenant described under "--
       Incurrence of Indebtedness" subsequent to the Issue Date; provided,
       however, that the provisions relating to such encumbrances or
       restrictions contained in such Indebtedness are not less favorable to
       Western, taken as a whole, in any material respect as determined in
       the good faith judgment of the Board of Directors of Western than the
       provisions relating to such encumbrance or restriction contained in
       the indenture.

 Merger, Consolidation or Sale of Assets

   Western may not, directly or indirectly: (1) consolidate or merge with or
into another Person (whether or not Western is the surviving corporation); or
(2) sell, assign, lease, transfer, convey or otherwise dispose of all or
substantially all of its properties or assets, in one or more related
transactions, to another Person unless:

  (1) either (a) Western is the surviving corporation or (b) the Person
      formed by or surviving any such consolidation or merger (if other than
      Western) or to which such sale, assignment, transfer, conveyance or
      other disposition shall have been made is a corporation organized or
      existing under the laws of the United States, any state thereof or the
      District of Columbia;

  (2) the Person formed by or surviving any such consolidation or merger (if
      other than Western) or the Person to which such sale, assignment,
      transfer, conveyance or other disposition shall have been made assumes
      all the obligations of Western under the notes and the indenture
      pursuant to agreements reasonably satisfactory to the trustee;

  (3) at the time of and immediately after giving effect to that transaction,
      no Default or event of default exists;

  (4) except in the case of a merger of Western with or into a Wholly Owned
      Restricted Subsidiary of Western or a sale, assignment, lease,
      transfer, conveyance or disposition to a Wholly Owned Restricted
      Subsidiary of Western, immediately after giving effect to that
      transaction on a pro forma basis, the Person formed by or surviving any
      such consolidation or merger (if other than Western) or to which such
      sale, assignment, transfer, conveyance or other disposition shall have
      been made shall have Consolidated Net Worth in an amount that is not
      less than the Consolidated Net Worth of Western immediately prior to
      such transaction;

  (5) except in the case of a merger of Western with or into a Wholly Owned
      Restricted Subsidiary of Western or a sale, assignment, lease,
      transfer, conveyance or disposition to a Wholly Owned Restricted
      Subsidiary of Western, Western or the Person formed by or surviving any
      such consolidation or merger (if other than Western) or to which such
      sale, assignment, transfer, lease, conveyance or other disposition
      shall have been made will, on the date of such transaction after giving
      pro forma effect thereto, be permitted to incur at least $1.00 of
      additional Indebtedness

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<PAGE>

     pursuant to the Consolidated Operating Cash Flow Ratio test set forth in
     the first paragraph of the covenant described above under the caption
     "--Incurrence of Indebtedness;" and

  (6) if any of the properties or assets of Western or any Restricted
      Subsidiary would upon such transaction or series of transactions become
      subject to any Lien (other than a Permitted Lien), the creation and
      imposition of such Lien shall have been in compliance with the covenant
      described above under the caption "--Liens."

In addition, Western may not, directly or indirectly, lease all or
substantially all of its properties or assets, in one or more related
transactions, to any other Person. This "Merger, Consolidation or Sale of
Assets" covenant will not apply to a merger by Western with an Affiliate of
Western that is a corporation incorporated solely for the purpose of
reincorporating Western in another jurisdiction.

 Transactions with Affiliates

   Western will not, and will not permit any of its Restricted Subsidiaries
to, conduct any business or enter into any transaction or series of similar
transactions (including, without limitation, the purchase, sale, lease,
transfer or exchange of any of its properties or assets or the rendering of
any service) with, or for the benefit of, any Affiliate of Western other than
a Restricted Subsidiary (each, an "Affiliate Transaction"), unless:

  (1) such Affiliate Transaction is on terms that are no less favorable to
      Western or the relevant Restricted Subsidiary in all material respects
      than those that would have been obtained in a comparable transaction by
      Western or such Restricted Subsidiary with an unrelated Person; and

  (2) Western delivers to the trustee:

    (a) with respect to any Affiliate Transaction or series of related
        Affiliate Transactions involving aggregate consideration in excess
        of $5.0 million an Officers' Certificate certifying that such
        Affiliate Transaction complies with clause (1) above and that such
        Affiliate Transaction has been approved by a majority of the
        Disinterested Directors; and

    (b) with respect to any Affiliate Transaction or series of related
        Affiliate Transactions involving aggregate consideration in excess
        of $15.0 million, an opinion as to the fairness of such Affiliate
        Transaction in all material respects, taken as a whole, to the

    (c) holders from a financial point of view issued by an accounting,
        engineering, appraisal or investment banking firm of national
        standing.

   The following items shall not be deemed to be Affiliate Transactions and,
therefore, will not be subject to the provisions of the prior paragraph:

  (1) Restricted Payments permitted by, and Permitted Investments that are
      not prohibited by, the provisions of the indenture described above
      under "Restricted Payments" (other than Permitted Investments in
      another Person in which an Affiliate of Western or an Affiliate of any
      of Western's Subsidiaries owns an interest);

  (2) any employment agreement, employee benefit plan, related trust
      agreement or any similar arrangement, payment of compensation and fees
      to, and indemnity provided on behalf of, employees, officers, directors
      or consultants, maintenance of benefit programs or arrangements for
      employees, officers or directors, including vacation plans, health and
      life insurance plans, deferred compensation plans, and retirement or
      savings plan and similar plans, and loans and advances to employees,
      officers, directors, consultants and shareholders, in each case entered
      into by Western or any of its Restricted Subsidiaries in the ordinary
      course of business or approved by a majority of Disinterested Directors
      (or the Board of Directors of Western in the case of plans or
      agreements affecting all employees, officers or directors as a group);

  (3) transactions between or among Western and/or its Restricted
      Subsidiaries;


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  (4) transactions with a Person that is an Affiliate of Western solely
      because Western owns any Capital Stock in such Person;

  (5) payment of directors fees;

  (6) any agreement or arrangement in effect on the Issue Date and any
      amendments, modifications or replacements thereof (so long as any such
      amendment, modification or replacement is no less favorable to Western
      and its Restricted Subsidiaries in any material respect than the
      agreement as in effect on the Issue Date); and

  (7) any stockholder agreement or registration rights agreement to which
      Western is a party on the Issue Date and any similar agreements which
      it may enter into thereafter; provided that the performance by Western
      or any of its Restricted Subsidiaries of obligations under any future
      amendment or under such a similar agreement entered into after the
      Issue Date shall only be permitted by this clause (7) to the extent
      that the terms are no less favorable to Western and its Restricted
      Subsidiaries in any material respect than the agreement as in effect on
      the Issue Date.

 Additional Subsidiary Guarantees

   Each current and future domestic Restricted Subsidiary of Western will be
required to be a Guarantor for so long as such Restricted Subsidiary has
outstanding any Guarantees with respect to any Senior Debt of Western. In
addition, Western may cause any other Restricted Subsidiary to become a
Guarantor. To become a Guarantor, a Restricted Subsidiary shall execute and
deliver to the trustee a supplemental indenture in form reasonably satisfactory
to the trustee providing for a Subsidiary Guarantee of the notes by such
Subsidiary, which Subsidiary Guarantee will be subordinated to Guarantor Senior
Debt (but no other Indebtedness) to the same extent that the notes are
subordinated to Senior Debt of Western. Thereafter, such Restricted Subsidiary
shall be deemed to be a Guarantor for all purposes under the indenture.

 Designation of Restricted and Unrestricted Subsidiaries

   The Board of Directors may designate any Restricted Subsidiary to be an
Unrestricted Subsidiary if that designation would not cause a Default or event
of default; provided that, in no event shall the business currently operated by
Western be transferred to or held by an Unrestricted Subsidiary, unless after
giving pro forma effect to such transfer Western could have incurred an
additional $1.00 of Indebtedness pursuant to the Consolidated Operating Cash
Flow Ratio test set forth in the first paragraph of the covenant described
under "Incurrence of Indebtedness." If a Restricted Subsidiary is designated as
an Unrestricted Subsidiary, all outstanding Investments owned by Western and
its Restricted Subsidiaries (except to the extent repaid in cash) in the
Subsidiary so designated will be deemed to be Restricted Payments at the time
of such designation and will reduce the amount available for Restricted
Payments under the first paragraph of the covenant described above under the
caption "--Restricted Payments." All such outstanding Investments will be
valued at their fair market value at the time of such classification as
determined in the good faith judgment of the Board of Directors. That
designation will only be permitted if such Restricted Payment would be
permitted at that time and if such Restricted Subsidiary otherwise meets the
definition of an Unrestricted Subsidiary. The Board of Directors may
redesignate any Unrestricted Subsidiary to be a Restricted Subsidiary, provided
that such designation shall be deemed to be an incurrence of Indebtedness by a
Restricted Subsidiary of Western of any outstanding Indebtedness of such
Unrestricted Subsidiary and such designation shall only be permitted if (1)
such Indebtedness is permitted under the covenant described under the caption
"--Incurrence of Indebtedness," calculated on a pro forma basis as if such
designation had occurred at the beginning of the four-quarter reference period;
and (2) no Default or event of default would be in existence following such
designation.

 Limitations on Issuances of Subsidiary Guarantees of Indebtedness

   Western will not permit any domestic Restricted Subsidiary that is not a
Guarantor (a "non-Guarantor Subsidiary"), directly or indirectly, to guarantee
or secure the payment of any Senior Debt of Western unless

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<PAGE>

such non-Guarantor Subsidiary simultaneously executes and delivers a
supplemental indenture to the indenture providing for a Subsidiary Guarantee of
the notes by such non-Guarantor Subsidiary, which Subsidiary Guarantee will be
subordinated to Guarantor Senior Debt (but no other Indebtedness) to the same
extent that the notes are subordinated to Senior Debt of Western.

 Payments for Consent

   Western will not, and will not permit any of its Subsidiaries to, directly
or indirectly, pay or cause to be paid any consideration to or for the benefit
of any holder of notes for or as an inducement to any consent, waiver or
amendment of any of the terms or provisions of the indenture or the notes
unless such consideration is offered to be paid and is paid to all holders of
the notes that consent, waive or agree to amend in the time frame set forth in
the solicitation documents relating to such consent, waiver or amendment.

 Reports

   Whether or not required by the Commission, so long as any notes are
outstanding, Western will furnish to the holders of notes, within the time
periods specified in the Commission's rules and regulations:

  (1) all quarterly and annual financial information that would be required
      to be contained in a filing with the Commission on Forms 10-Q and 10-K
      if Western were required to file such forms, including a "Management's
      Discussion and Analysis of Financial Condition and Results of
      Operations" and, with respect to the annual information only, a report
      on the annual financial statements by Western's certified independent
      accountants; and

  (2) all current reports that would be required to be filed with the
      Commission on Form 8-K if Western were required to file such reports.

   In addition, whether or not required by the Commission, Western will file a
copy of all of the information and reports referred to in clauses (1) and (2)
above with the Commission for public availability within the time periods
specified in the Commission's rules and regulations (unless the Commission will
not accept such a filing) and make such information available to securities
analysts and prospective investors upon request.

Events of Default and Remedies

   Each of the following is an event of default:

  (1) default for a continued period of 30 days in the payment when due of
      interest on the notes, whether or not prohibited by the subordination
      provisions of the indenture;

  (2) default in payment when due of the principal of or premium, if any, on
      the notes, whether or not prohibited by the subordination provisions of
      the indenture;

  (3) failure by Western or any of its Restricted Subsidiaries to comply with
      the provisions described under the captions "--Merger, Consolidation or
      Sale of Assets" or "--Repurchase at Option of holders--Change of
      Control" or "--Asset Disposition;"

  (4) failure by Western or any of its Restricted Subsidiaries for 30 days
      after notice from the trustee or the holders of at least 25% in
      principal amount of the notes then outstanding to comply with the
      provisions described under the captions "--Certain Covenants--
      Restricted Payments" or "--Incurrence of Indebtedness;"

  (5) failure by Western or any of its Restricted Subsidiaries for 60 days
      after notice from the trustee or the holders of at least 25% in
      principal amount of the notes then outstanding to comply with any of
      the other agreements in the indenture;

  (6) default under any mortgage, indenture or instrument under which there
      may be issued or by which there may be secured or evidenced any
      Indebtedness for money borrowed by Western or any of its

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<PAGE>

     Restricted Subsidiaries (or the payment of which is guaranteed by
     Western or any of its Restricted Subsidiaries) whether such Indebtedness
     or guarantee now exists, or is created after the date of the indenture,
     if that default:

    (a) is caused by a failure to pay principal of or premium, if any, or
        interest on such Indebtedness at final maturity upon the expiration
        of any grace period provided in such Indebtedness (a "Payment
        Default"); or

    (b) results in the acceleration of such Indebtedness prior to its
        express maturity,

    and, in each case, the principal amount of any such Indebtedness,
    together with the principal amount of any other such Indebtedness under
    which there has been a Payment Default or the maturity of which has been
    so accelerated, aggregates $10.0 million or more;

  (7) the failure by Western or any of its Restricted Subsidiaries to pay a
      final judgment or judgments (not subject to appeal) against Western or
      any of its Restricted Subsidiaries in an aggregate principal amount in
      excess of $10.0 million, which judgments are not paid, discharged or
      stayed for a period of 60 consecutive days;

  (8) except as permitted by the indenture, any Subsidiary Guarantee shall be
      held in any judicial proceeding to be unenforceable or invalid or shall
      cease for any reason to be in full force and effect or any Guarantor,
      or any Person acting on behalf of any Guarantor, shall deny or
      disaffirm its obligations under its Subsidiary Guarantee; and

  (9) certain events of bankruptcy or insolvency with respect to Western or
      any of its Restricted Subsidiaries.

   In the case of an event of default arising from certain events of
bankruptcy or insolvency with respect to Western, any Restricted Subsidiary
that is a Significant Subsidiary or any group of Restricted Subsidiaries that,
taken together, would constitute a Significant Subsidiary, all outstanding
notes will become due and payable immediately without further action or
notice. If any other event of default occurs and is continuing, the trustee or
the holders of at least 25% in principal amount of the then outstanding notes
may declare all the notes to be due and payable immediately; provided that
such acceleration shall not be effective until the earlier of (i) an
acceleration of the Designated Senior Debt or (ii) five business days after
receipt by Western of written notice of such acceleration.

   Holders of the notes may not enforce the indenture or the notes except as
provided in the indenture. Subject to certain limitations, holders of a
majority in principal amount of the then outstanding notes may direct the
trustee in its exercise of any trust or power. The trustee may withhold from
holders of the notes notice of any continuing Default or event of default
(except a Default or event of default relating to the payment of principal
(and premium, if any) or interest) if it determines that withholding notice is
in their interest.

   The holders of a majority in aggregate principal amount of the notes then
outstanding by notice to the trustee may on behalf of the holders of all of
the notes waive any existing Default or event of default and its consequences
under the indenture except a continuing Default or event of default in the
payment of interest on, or the principal of (and premium, if any), the notes.

   No holder of any note will have any right to institute any proceeding with
respect to the indenture or for any remedy thereunder, unless such holder
shall have previously given to the trustee written notice of a continuing
event of default and unless the holders of at least 25% in aggregate principal
amount of the outstanding notes shall have made written request, and offered
reasonable indemnity, to the trustee to institute such proceeding as trustee,
and the trustee shall not have received from the holders of a majority in
aggregate principal amount of the outstanding notes a direction inconsistent
with such request and shall have failed to institute such proceeding within 60
days. However, such limitations do not apply to a suit instituted by a holder
of a note for enforcement of payment of the principal of (and premium, if any)
or interest on such note on or after the respective due dates expressed in
such note.

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   Western is required to deliver to the trustee annually a statement regarding
compliance with the indenture. Upon becoming aware of any Default or event of
default, Western is required to deliver to the trustee a statement specifying
such Default or event of default.

No Personal Liability of Directors, Officers, Employees, Incorporators and
Stockholders

   No director, officer, employee, incorporator or stockholder of Western or
any Guarantor, as such, shall have any liability for any obligations of Western
or the Guarantors under the notes, the indenture, the Subsidiary Guarantees, or
for any claim based on, in respect of, or by reason of, such obligations or
their creation. Each holder of notes by accepting a note waives and releases
all such liability. The waiver and release are part of the consideration for
issuance of the notes. The waiver may not be effective to waive liabilities
under the federal securities laws, and it is the view of the Commission that
such a waiver is against public policy.

Legal Defeasance and Covenant Defeasance

   Western may, at its option and at any time, elect to have all of its
obligations discharged with respect to the outstanding notes and all
obligations of the Guarantors discharged with respect to their Subsidiary
Guarantees ("Legal Defeasance") except for:

  (1) the rights of holders of outstanding notes to receive payments in
      respect of the principal of, premium, if any, and interest on such
      notes when such payments are due from the trust referred to below;

  (2) Western's obligations with respect to the notes concerning issuing
      temporary notes, registration of notes, mutilated, destroyed, lost or
      stolen notes and the maintenance of an office or agency for payment and
      money for security payments held in trust;

  (3) the rights, powers, trusts, duties and immunities of the trustee, and
      Western's obligations in connection therewith; and

  (4) the Legal Defeasance provisions of the indenture.

   In addition, Western may, at its option and at any time, elect to have the
obligations of Western and the Guarantors released with respect to certain
covenants that are described in the indenture ("Covenant Defeasance") and
thereafter any omission to comply with those covenants shall not constitute a
Default or event of default with respect to the notes. In the event Covenant
Defeasance occurs, certain events (not including non-payment, bankruptcy,
receivership, rehabilitation and insolvency events) described under "Events of
Default" will no longer constitute an event of default with respect to the
notes.

   In order to exercise either Legal Defeasance or Covenant Defeasance:

  (1) Western must irrevocably deposit with the trustee, in trust, for the
      benefit of the holders of the notes, cash in U.S. dollars, non-callable
      Government Securities, or a combination thereof, in such amounts as
      will be sufficient, in the opinion of a nationally recognized firm of
      independent public accountants, to pay the principal of, premium, if
      any, and interest on the outstanding notes on the stated maturity or on
      the applicable redemption date, as the case may be, and Western must
      specify whether the notes are being defeased to maturity or to a
      particular redemption date;

  (2) in the case of Legal Defeasance, Western shall have delivered to the
      trustee an Opinion of Counsel reasonably acceptable to the trustee
      confirming that (a) Western has received from, or there has been
      published by, the Internal Revenue Service a ruling or (b) since the
      date of the indenture, there has been a change in the applicable
      federal income tax law, in either case, to the effect that, and based
      thereon such Opinion of Counsel shall confirm that, the holders of the
      outstanding notes will not recognize income, gain or loss for federal
      income tax purposes as a result of such Legal Defeasance and will be
      subject to federal income tax on the same amounts, in the same manner
      and at the same times as would have been the case if such Legal
      Defeasance had not occurred;


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  (3) in the case of Covenant Defeasance, Western shall have delivered to the
      trustee an Opinion of Counsel reasonably acceptable to the trustee
      confirming that the holders of the outstanding notes will not recognize
      income, gain or loss for federal income tax purposes as a result of
      such Covenant Defeasance and will be subject to federal income tax on
      the same amounts, in the same manner and at the same times as would
      have been the case if such Covenant Defeasance had not occurred;

  (4) no Default or event of default shall have occurred and be continuing
      either: (a) on the date of such deposit (other than a Default or event
      of default resulting from the borrowing of funds to be applied to such
      deposit); or (b) or insofar as Events of Default from bankruptcy or
      insolvency events are concerned, at any time in the period ending on
      the 91st day after the date of deposit;

  (5) such Legal Defeasance or Covenant Defeasance will not result in a
      breach or violation of, or constitute a default under, any material
      agreement or instrument (other than the indenture) to which Western or
      any of its Restricted Subsidiaries is a party or by which Western or
      any of its Restricted Subsidiaries is bound;

  (6) Western must have delivered to the trustee an Opinion of Counsel to the
      effect that after the 91st day following the deposit, the trust funds
      will not be subject to the effect of any applicable bankruptcy,
      insolvency, reorganization or similar laws affecting creditors' rights
      generally;

  (7) Western must deliver to the trustee an Officers' Certificate stating
      that the deposit was not made by Western with the intent of preferring
      the holders of notes over the other creditors of Western with the
      intent of defeating, hindering, delaying or defrauding creditors of
      Western or others; and

  (8) Western must deliver to the trustee an Officers' Certificate and an
      Opinion of Counsel, each stating that all conditions precedent relating
      to the Legal Defeasance or the Covenant Defeasance have been complied
      with.

Amendment, Supplement and Waiver

   Modifications and amendments of the indenture may be made by Western and the
trustee with the consent of the holders of a majority in aggregate principal
amount of the outstanding notes; provided, however, that without the consent of
each holder affected, an amendment or waiver may not (with respect to any notes
held by a non-consenting holder):

  (1) change the Stated Maturity of the principal of (or premium, if any), or
      reduce the rate or change the time for payment of interest on, any
      note;

  (2) reduce the principal amount of (or premium, if any), or interest on,
      any notes;

  (3) change the currency of payment of principal of (or premium, if any), or
      interest on, any notes;

  (4) impair the right to institute suit for the enforcement of any payment
      on or with respect to any notes;

  (5) reduce the above-stated percentage of aggregate principal amount of
      outstanding notes necessary for waiver of compliance with certain
      provisions of the indenture or for waiver of certain defaults;

  (6) modify any provisions of the indenture relating to the modification and
      amendment of the indenture or any provisions of the indenture relating
      to the waiver of past defaults or covenants, except as otherwise
      specified; or

  (7) modify or amend the obligation of Western to make and consummate a
      Change of Control Offer in the event of a Change of Control.

   Notwithstanding the preceding, without the consent of any holder of notes,
Western and the trustee may amend or supplement the indenture or the notes:

  (1) to cure any ambiguity, defect or inconsistency;

  (2) to provide for uncertificated notes in addition to or in place of
      certificated notes;

  (3) to provide for the assumption of Western's obligations to holders of
      notes in the case of a merger or consolidation or sale of all or
      substantially all of Western's assets;

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<PAGE>

  (4) to make any change that would provide any additional rights or benefits
      to the holders of notes or that does not adversely affect the legal
      rights under the indenture of any such holder; or

  (5) to comply with requirements of the Commission in order to effect or
      maintain the qualification of the indenture under the Trust Indenture
      Act.

   The holders of a majority in aggregate principal amount of the outstanding
notes may waive Western's compliance with certain restrictive provisions of the
indenture. The holder of a majority in aggregate principal amount of the
outstanding notes may waive any past default under the indenture, except a
default in the payment of principal, premium or interest and certain covenants
and provisions of the indenture which cannot be amended without the consent of
holders of each outstanding note.

Concerning the Trustee

   If the trustee becomes a creditor of Western or any Guarantor, the indenture
limits its right to obtain payment of claims in certain cases, or to realize on
certain property received in respect of any such claim as security or
otherwise. The trustee will be permitted to engage in other transactions with
Western or an Affiliate of Western; however, if the trustee acquires any
conflicting interest it must eliminate such conflict within 90 days, apply to
the Commission for permission to continue or resign.

   The holders of a majority in principal amount of the then outstanding notes
will have the right to direct the time, method and place of conducting any
proceeding for exercising any remedy available to the trustee, subject to
certain exceptions. The indenture provides that in case an event of default
shall occur and be continuing, the trustee will be required, in the exercise of
its power, to use the degree of care of a prudent person in the conduct of such
person's own affairs. Subject to such provisions, the trustee will be under no
obligation to exercise any of its rights or powers under the indenture at the
request of any holder of notes, unless such holder shall have offered to the
trustee security and indemnity satisfactory to it against any loss, liability
or expense.

Certain Definitions

   Set forth below are certain defined terms used in the indenture. Reference
is made to the indenture for a full disclosure of all such terms, as well as
any other capitalized terms used herein for which no definition is provided.

   "Acquired Debt" means, with respect to any specified Person:

  (1) Indebtedness of any other Person existing at the time such other Person
      is merged with or into or became a Subsidiary of such specified Person
      or assumed in connection with an acquisition by such Person of the
      properties and assets of any Person which constitute all or
      substantially all of the properties and assets of such Person or any
      division or line of business or business segment of such Person,
      whether or not such Indebtedness is incurred in connection with, or in
      contemplation of, such other Person merging with or into, or becoming a
      Subsidiary of, such specified Person or such acquisition; and

  (2) Indebtedness secured by a Lien encumbering any asset acquired by such
      specified Person.

   "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person. For purposes of this definition, "control,"
as used with respect to any Person, shall mean the possession, directly or
indirectly, of the power to direct or cause the direction of the management or
policies of such Person, whether through the ownership of voting securities, by
agreement or otherwise. For purposes of this definition, the terms
"controlling," "controlled by" and "under common control with" shall have
correlative meanings. Notwithstanding the foregoing, any Person who enters with
Western or any of its Subsidiaries into any Permitted Business Investment
(including, without limitation, any Person who has an ownership, management or
operating position

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in any Permitted Business Investment), and any Person created as a result of
the foregoing, shall not be deemed to be an Affiliate for purposes of the
indenture solely by reason of entering into, or owning an ownership, management
or operating position in, a Permitted Business Investment or being a Person so
created, as the case may be.

   "Asset Disposition" by any Person means any transfer, conveyance, sale,
lease or other disposition by such Person or any of its Restricted Subsidiaries
(including by means of a Sale/Leaseback Transaction or a consolidation or
merger or other sale of any such Restricted Subsidiaries with, into or to
another Person in a transaction in which such Restricted Subsidiary ceases to
be a Restricted Subsidiary, but excluding a disposition by a Restricted
Subsidiary of such Person to such Person or a Restricted Subsidiary of such
Person or by such Person to a Restricted Subsidiary of such Person), directly
or indirectly, in one or a series of related transactions, of

  (1) shares of Capital Stock (other than directors' qualifying shares) of a
      Restricted Subsidiary of such Person held by such Person or a
      Restricted Subsidiary of such Person,

  (2) substantially all of the assets of such Person or any of its Restricted
      Subsidiaries representing a division, or line of business or business
      segment, or

  (3) other properties or assets of such Person or any of its Restricted
      Subsidiaries outside of the ordinary course of business,

which in the case of either clause (1), (2) or (3) whether in a single
transaction or a series of related transactions, results in Net Available
Proceeds in excess of $5.0 million. For the purpose of this definition, the
term "Asset Disposition" shall not include:

  (a) any transfer of properties or assets that is governed by, and made in
      accordance with, the provisions described under the caption "--Merger,
      Consolidation or Sale of Assets,"

  (b) any transfer of properties or assets to any Person if permitted under
      the definition of Permitted Investments (except as set forth in clause
      (d) below) or if permitted under the provisions described under the
      caption "--Certain Covenants--Restricted Payments,"

  (c) any trade or exchange of properties and assets used in the Principal
      Business of Western or shares of Capital Stock in any Person in the
      Principal Business of Western or any Restricted Subsidiary of Western,
      in each case owned by Western or any Restricted Subsidiary, for
      properties and assets of any Person used in the Principal Business in
      any Person owned or held by another Person, provided, that (A) the fair
      market value of the properties, assets and shares traded or exchanged
      by Western or such Restricted Subsidiary is reasonably equivalent to or
      less than the fair market value of the properties and assets to be
      received by Western or such Restricted Subsidiary as determined in good
      faith by (x) any officer of Western if such fair market value is less
      than $5.0 million and (y) the Board of Directors of Western as
      evidenced by a certified resolution delivered to the trustee if such
      fair market value is equal to or in excess of $5.0 million; provided,
      that if such fair market value is equal to or in excess of $30.0
      million Western shall deliver a written appraisal by a nationally
      recognized accounting, engineering, appraisal or investment banking
      firm, in each case specializing or having a specialty in oil and gas
      properties, and (B) such exchange is approved by a majority of the
      Disinterested Directors, provided, further, that if such trade or
      exchange results in the receipt by Western or a Restricted Subsidiary
      of Western of aggregate cash or Cash Equivalents in excess of $5.0
      million, such cash or Cash Equivalents shall be deemed to be Net
      Available Proceeds for purposes of "--Repurchase at Option of holders--
      Asset Disposition," or

  (d) any Permitted Business Investment; provided that if such investment
      results in the receipt by Western or a Restricted Subsidiary of Western
      of cash or Cash Equivalents (excluding any dividends or distributions
      of earnings) such cash or Cash Equivalents shall be deemed Net
      Available Proceeds for purposes of this covenant.


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<PAGE>

   "Attributable Debt" means, in respect of a Sale/Leaseback Transaction, at
the time of determination, the present value of the obligation of the lessee
for net rental payments during the remaining term of the lease included in such
Sale/Leaseback Transaction including any period for which such lease has been
extended or may, at the option of the lessor, be extended. Such present value
shall be calculated using a discount rate equal to the rate of interest
implicit in such transaction, determined in accordance with GAAP.

   "Board of Directors" means, (1) with respect to Western, either the Board of
Directors of Western or any properly constituted committee thereof that is
authorized to take the action in question and (2) with respect to any
Restricted Subsidiary of Western, the Board of Directors of that Restricted
Subsidiary or any properly constituted committee thereof that is authorized to
take the action in question.

   "Capitalized Lease Obligation" of any Person means any lease of any property
(whether real, personal or mixed) by such Person as lessee in respect of which
the present value of the minimum rental commitment would be capitalized on a
balance sheet of the lessee in accordance with GAAP.

   "Capital Stock" means:

  (1) in the case of a corporation, corporate stock;

  (2) in the case of an association or business entity, any and all shares,
      interests, participations, rights or other equivalents (however
      designated) of corporate stock;

  (3) in the case of a partnership or limited liability company, partnership
      or membership interests (whether general or limited); and

  (4) any other interest or participation that confers on a Person the right
      to receive a share of the profits and losses of, or distributions of
      assets of, the issuing Person.

   "Cash Equivalents" means:

  (1) United States dollars;

  (2) securities issued or directly and fully guaranteed or insured by the
      United States government or any agency or instrumentality thereof
      (provided that the full faith and credit of the United States is
      pledged in support thereof) having maturities of not more than twelve
      months from the date of acquisition;

  (3) certificates of deposit and eurodollar time deposits with maturities of
      six months or less from the date of acquisition, bankers' acceptances
      with maturities not exceeding six months and overnight bank deposits,
      in each case, with any domestic commercial bank having capital and
      surplus in excess of $500 million and a Thompson Bank Watch Rating of
      "B" or better;

  (4) repurchase obligations with a term of not more than seven days for
      underlying securities of the types described in clauses (2) and (3)
      above entered into with any financial institution meeting the
      qualifications specified in clause (3) above;

  (5) commercial paper and other securities having the highest rating
      obtainable from Moody's or S&P and in each case maturing within twelve
      months after the date of acquisition; and

  (6) investments in money market or other mutual funds substantially all of
      whose assets comprise securities of the types described in clauses (2)
      through (5) above.

   "Change of Control" means the occurrence of any of the following:

  (1) the sale, transfer, conveyance or other disposition (other than by way
      of merger or consolidation), in one or a series of related
      transactions, of all or substantially all of the assets of Western and
      its Subsidiaries taken as a whole to another "person" (as such term is
      used in Section 13(d)(3) of the Exchange Act) other than a Principal or
      a Person controlled by a Principal;

  (2) the adoption of a plan relating to the liquidation or dissolution of
      Western;


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<PAGE>

  (3) the consummation of any transaction (including, without limitation, any
      merger or consolidation) the result of which is that any "person" (as
      defined above) other than a Principal or a Person controlled by a
      Principal, becomes the beneficial owner (as determined in accordance
      with Rule 13(d)(3) under the Exchange Act), directly or indirectly, of
      at least 50% of the total voting power of all classes of Capital Stock
      of Western; or

  (4) the first day on which a majority of the members of the Board of
      Directors of Western are not Continuing Directors.

   "Consolidated Net Operating Income" means, with respect to any specified
Person for any period, the aggregate of the net income (or loss) of such Person
and its Restricted Subsidiaries for such period, on a consolidated basis,
determined in accordance with GAAP; provided that:

  (1) the net income (or loss) of any Person that is not a Subsidiary or that
      is accounted for by the equity method of accounting shall be excluded
      (except to the extent of the amount of cash dividends or cash
      distributions paid to the specified Person or its Restricted
      Subsidiaries);

  (2) the net income (or loss) of any Person acquired in a pooling of
      interests transaction for any period prior to the date of such
      acquisition shall be excluded;

  (3) the net income of any Restricted Subsidiary of such Person shall be
      excluded to the extent the transfer to that Person of that income is
      restricted by contract or otherwise (except to the extent of the amount
      of cash or other distributions paid to the specified Person or its
      Restricted Subsidiaries);

  (4) the net income (or loss) of any Unrestricted Subsidiary of such Person
      shall be excluded (except to the extent of the amount of cash dividends
      or other cash distributions paid to the specified Person or its
      Restricted Subsidiaries);

  (5) extraordinary gains and losses, and gains and losses from the sale of
      assets outside the ordinary course of such Person's business, shall be
      excluded;

  (6) the cumulative effect of a change in accounting principles shall be
      excluded;

  (7) any write-downs of non-current assets, provided that any ceiling
      limitation write-downs under Commission guidelines or impairments of
      oil and gas properties required by Statement of Financial Accounting
      Standards No. 121 of the Financial Accounting Standards Board shall be
      excluded as if such write-downs had not occurred; and

  (8) the tax effect of any of the items described in clauses (1) through (7)
      above shall be excluded.

   "Consolidated Net Worth" means, at any date, the stockholders' equity of
Western and its Restricted Subsidiaries, as determined on a consolidated basis
in accordance with GAAP, less (to the extent included in stockholders' equity)
amounts attributable to Disqualified Stock of Western or its Restricted
Subsidiaries.

   "Consolidated Operating Cash Flow" means, with respect to any Person for any
period, the Consolidated Net Operating Income of such Person and its Restricted
Subsidiaries for such period plus:

  (1) consolidated Fixed Charges of such Person and its Restricted
      Subsidiaries which reduced Consolidated Net Operating Income for such
      period; plus

  (2) consolidated income tax expense of such Person and its Restricted
      Subsidiaries which reduced Consolidated Net Operating Income for such
      period; plus

  (3) consolidated depreciation, depletion and amortization expense
      (including amortization of purchase accounting adjustments) of such
      Person and its Restricted Subsidiaries and any other non-cash items to
      the extent that such depreciation, depletion, amortization and other
      non-cash items reduced Consolidated Net Operating Income for such
      period; minus

  (4) non-cash items which increased Consolidated Net Operating Income for
      such period,

in each case, on a consolidated basis and determined in accordance with GAAP
for the four full quarters for which financial information in respect thereof
is available immediately prior to the Transaction Date.

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<PAGE>

   Notwithstanding the preceding, the provision for taxes based on the income
or profits of, and the depreciation, depletion and amortization and other non-
cash charges of, a Restricted Subsidiary of Western shall be added to
Consolidated Net Operating Income to compute Consolidated Operating Cash Flow
of Western only to the extent that a corresponding amount would be permitted at
the date of determination to be dividended, distributed or otherwise paid to
Western by such Restricted Subsidiary without prior approval (that has not been
obtained) pursuant to the terms of its charter and all agreements, instruments,
judgments, decrees, orders, statutes, rules and governmental regulations
applicable to that Restricted Subsidiary or its stockholders.

   "Consolidated Operating Cash Flow Ratio" means, with respect to any Person,
the ratio of

  (1) Consolidated Operating Cash Flow of such Person and its Restricted
      Subsidiaries for the four quarters for which financial information in
      respect thereof is available immediately prior to the Transaction Date
      to

  (2) the aggregate Fixed Charges of such Person and its Restricted
      Subsidiaries for such four quarters, such Fixed Charges to be
      calculated on the basis of the amount of the Indebtedness of such
      Person and its Restricted Subsidiaries outstanding on the Transaction
      Date and interest on Indebtedness which accrues on a fluctuating basis
      for periods succeeding the date of determination shall be deemed to
      accrue at a rate equal to the average daily rate of interest in effect
      during such immediately preceding quarter;

provided, however, that if such Person or any Restricted Subsidiary of such
Person shall have acquired, sold or otherwise disposed of any asset material to
its Principal Business or engaged in a Public Equity Offering during the four
full quarters for which financial information in respect thereof is available
immediately prior to the Transaction Date or during the period from the end of
such fourth full quarter to and including the Transaction Date, the calculation
required in clause (1) above will be made giving effect to such acquisition,
sale or disposition or the other investment of the net proceeds of such Public
Equity Offering on a pro forma basis as if such acquisition, sale, disposition
or offering had occurred at the beginning of such four full quarter period
without giving effect to clause (2) of the definition of "Consolidated Net
Operating Income" (that is, including in such calculation the net income for
the relevant prior period of any Person acquired in a pooling of interests
transaction, notwithstanding the provisions of said clause (2)); provided,
further, that Fixed Charges of such Person during the applicable period shall
not include the amount of consolidated Interest Expense which is directly
attributable to Indebtedness to the extent such Indebtedness is reduced by the
proceeds of the incurrence of such Indebtedness which gave rise to the need to
calculate the Consolidated Operating Cash Flow Ratio.

   "Continuing Directors" means, as of any date of determination, any member of
the Board of Directors of Western who:

  (1) was a member of such Board of Directors on the date of the indenture;
      or

  (2) was nominated for election or elected to such Board of Directors with
      the approval of a majority of the Continuing Directors who were members
      of such Board at the time of such nomination or election.

   "Credit Facilities" means, one or more debt agreements, including without
limitation, commercial paper facilities, in each case with banks or other
institutional lenders, providing for revolving credit loans, term loans or
letters of credit, in each case, as amended, restated, modified, renewed,
refunded, replaced or refinanced in whole or in part from time to time. The
term "Credit Facilities" shall include the Revolving Credit Facility, but shall
exclude any other Senior Debt Agreements.

   "Default" means any event that is, or with the passage of time or the giving
of notice or both would be, an event of default.

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   "Designated Senior Debt" means

  (1) any Obligations outstanding from time to time under the Senior Debt
      Agreements; and

  (2) any other Senior Debt permitted under the indenture the principal
      amount of which is $50.0 million or more and that has been designated
      by Western as "Designated Senior Debt."

   "Disinterested Director" means, as used with reference to the covenant
entitled "--Certain Covenants--Transactions with Affiliates," a member of the
Board of Directors who does not have any material direct or indirect financial
interest (other than an interest arising solely from the beneficial ownership
of Capital Stock of Western) in or with respect to the particular transaction
or series of transactions, if any, that is subject to approval by a majority of
the Disinterested Directors pursuant to such covenant.

   "Disqualified Stock" means any Capital Stock of Western that, by its terms
(or by the terms of any security into which it is convertible, or for which it
is exchangeable, in each case at the option of the holder thereof), or upon the
happening of any event, matures or is mandatorily redeemable, pursuant to a
sinking fund obligation or otherwise, or redeemable at the option of the holder
thereof, in whole or in part, on or prior to the date that is 91 days after the
date on which the notes mature. Notwithstanding the preceding sentence, any
Capital Stock that would constitute Disqualified Stock solely because the
holders thereof have the right to require Western to repurchase such Capital
Stock upon the occurrence of a change of control or an asset sale shall not
constitute Disqualified Stock if the terms of such Capital Stock provided that
Western may not repurchase or redeem any such Capital Stock pursuant to such
provisions unless such repurchase or redemption complies with the covenant
entitled "--Certain Covenants--Restricted Payments."

   "Dollar-Denominated Production Payments" means production payment
obligations recorded as liabilities in accordance with GAAP, together with all
undertakings and obligations in connection therewith.

   "Existing Indebtedness" means any outstanding Indebtedness of Western and
its Subsidiaries as of the Issue Date after giving effect to the use of
proceeds of this Offering.

   "Fixed Charges" of any Person means, for any period, the sum, without
duplication, of (1) consolidated Interest Expense of such Person and its
Restricted Subsidiaries, plus (2) all but the principal component of rentals in
respect of consolidated Capitalized Lease Obligations of such Person and its
Restricted Subsidiaries paid, accrued or scheduled to be paid or accrued by
such Person and its Restricted Subsidiaries during such period, and determined
in accordance with GAAP plus (3) all dividends paid or accrued (excluding items
eliminated in consolidation) on any series of preferred stock of such Person.

   For purposes of this definition:

  (a) interest on Indebtedness which accrues on a fluctuating basis for
      periods succeeding the date of determination shall be deemed to accrue
      at a rate equal to the average daily rate of interest in effect during
      such immediately preceding quarter,

  (b) interest on a Capitalized Lease Obligation shall be deemed to accrue at
      an interest rate reasonably determined in good faith by the chief
      financial officer, treasurer or controller of such Person to be the
      rate of interest implicit in such Capitalized Lease Obligation in
      accordance with GAAP (including Statement of Financial Accounting
      Standards No. 13 of the Financial Accounting Standards Board),

  (c) in making such computation, the consolidated Interest Expense
      attributable to interest on any Indebtedness under a revolving credit
      facility shall be computed based upon the average daily balance of such
      Indebtedness during the applicable period, provided, that such average
      daily balance shall be reduced by the amount of any repayment of
      Indebtedness under a revolving credit facility during the applicable
      period, which repayment permanently reduced the commitments or amounts
      available to be reborrowed under such facility, and

  (d) notwithstanding clauses (a) and (b) of this proviso, interest on
      Indebtedness determined on a fluctuating basis, to the extent such
      interest is covered by agreements relating to interest rate

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<PAGE>

     protection agreements, shall be deemed to have accrued at the rate per
     annum resulting after giving effect to the operation of such agreements.

   "GAAP" means generally accepted accounting principles set forth in the
opinions and pronouncements of the Accounting Principles Board of the American
Institute of Certified Public Accountants and statements and pronouncements of
the Financial Accounting Standards Board or in such other statements by such
other entity as have been approved by a significant segment of the accounting
profession, which are in effect on the Issue Date.

   "Government Securities" means securities that are (1) direct obligations of
the United States of America for the timely payment of which its full faith
and credit is pledged or (2) obligations of a Person controlled or supervised
by and acting as an agency or instrumentality of the United States of America,
the timely payment of which is unconditionally guaranteed as a full faith and
credit obligation by the United States of America which, in either case, are
not callable or redeemable at the option of the issuer thereof, and shall also
include a depository receipt issued by a bank (as defined in Section 2(a)(2)
of the Securities Act), as custodian, with respect to any such Government
Security or a specific payment of principal of or interest on any such
Government Security held by such custodian for the account of the holder of
such depository receipt; provided, however, that (except as required by law)
such custodian is not authorized to make any deduction from the amount payable
to the holder of such depository receipt from any amount received by the
custodian in respect of the Government Security or the specific payment of
principal of or interest on the Government Security evidenced by such
depository receipt.

   "Guarantee" means a guarantee other than by endorsement of negotiable
instruments for collection in the ordinary course of business, direct or
indirect, in any manner including, without limitation, by way of a pledge of
assets or through letters of credit or reimbursement agreements in respect
thereof, of all or any part of Indebtedness.

   "Guarantor Senior Debt" with respect to a Guarantor means:

  (1) all Indebtedness outstanding under the Senior Debt Agreements
      (including interest after the commencement of any bankruptcy or
      insolvency proceeding at the rate specified in the applicable Senior
      Debt Agreements) and all Hedging Obligations with respect thereto;

  (2) any other Indebtedness permitted to be incurred by such Guarantor under
      the terms of the indenture, unless the instrument under which such
      Indebtedness is incurred expressly provides that it is on a parity with
      the Subsidiary Guarantee or subordinated in right of payment to the
      Subsidiary Guarantee or any other Indebtedness of such Guarantor; and

  (3) all Obligations with respect to the items listed in the preceding
      clauses (1) and (2).

   Notwithstanding anything to the contrary in the preceding, Guarantor Senior
Debt will not include:

  (1) any liability for federal, state, local or other taxes owed or owing by
      such Guarantor;

  (2) any Indebtedness of such Guarantor to Western or any of Western's
      Subsidiaries or other Affiliates;

  (3) any trade payables;

  (4) any Indebtedness that is incurred in violation of the indenture;

  (5) any Indebtedness represented by preferred stock; or

  (6)  any Indebtedness evidenced by the Subsidiary Guarantees.

   "Guarantors" means each of:

  (1) Lance Oil & Gas Company, Inc., MGTC, Inc., MIGC, Inc., Mountain Gas
      Resources, Inc., Pinnacle Gas Treating, Inc., Western Gas Resources --
      Texas, Inc., Western Gas Resources -- Oklahoma, Inc., Western Gas
      Wyoming, L.L.C.; and


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  (2) any other Subsidiary of Western that executes a Subsidiary Guarantee in
      accordance with the provisions of the identure;

and their respective successors and assigns.

   "Hedging Obligations" means, with respect to any specified Person, the
obligations of such Person under:

  (1) interest rate swap agreements, interest rate cap agreements, interest
      rate collar agreements, futures contracts, forward contracts, options
      contracts, hedges and other derivative contracts and similar
      arrangements;

  (2) other agreements or arrangements designed to protect such person
      against fluctuations in interest rates;

  (3) agreements or arrangements designed to protect such Person against
      exchange rate risk with respect to any agreement or indebtedness of
      such Person payable in a currency other than U.S. dollars; and

  (4) agreements or arrangements designed to protect such Person against
      commodities risk relating to commodities agreements, entered into in
      the ordinary course of business by Western and its Restricted
      Subsidiaries.

   "Holder" means the Person in whose name a note is registered on Western's
securities register.

   "Indebtedness" means, with respect to any Person, without duplication,

  (1) all liabilities of such Person for borrowed money or for the deferred
      purchase price of property or services, excluding any trade accounts
      payable and other accrued current liabilities incurred in the ordinary
      course of business, but including, without limitation, all obligations,
      contingent or otherwise, of such Person in connection with any letters
      of credit, bankers' acceptance or other similar credit transaction,

  (2) all obligations of such Person evidenced by bonds, notes, debentures or
      other similar instruments,

  (3) all Indebtedness of such Person created or arising under any
      conditional sale or other title retention agreement with respect to
      property acquired by such Person (even if the rights and remedies of
      the seller or lender under such agreement in the event of default are
      limited to repossession or sale of such property), but excluding trade
      accounts payable arising in the ordinary course of business,

  (4) all Capitalized Lease Obligations of such Person,

  (5) the Attributable Debt (in excess of any related Capitalized Lease
      Obligations) related to any Sale/Leaseback Transaction of such Person,

  (6) all Indebtedness referred to in the preceding clauses of other Persons,
      the payment of which is secured by (or for which the holder of such
      Indebtedness has an existing right, contingent or otherwise, to be
      secured) any Lien upon property (including, without limitation,
      accounts and contract rights) owned by such Person, even though such
      Person has not assumed or become liable for the payment of such
      Indebtedness (the amount of such obligation being deemed to be the
      lesser of the value of such property or asset or the amount of the
      obligation so secured),

  (7) all guarantees by such Person of Indebtedness referred to in this
      definition (including, with respect to any Production Payment, any
      warranties or guarantees of production or payment by such Person with
      respect to such Production Payment but excluding other contractual
      obligations of such Person with respect to such Production Payment),

  (8) all Disqualified Stock of such Person valued at the greater of its
      voluntary or involuntary maximum fixed repurchase price plus accrued
      dividends,

  (9) all obligations of such Person under or in respect of Hedging
      Obligations, and

  (10) any amendment, supplement, modification, deferral, renewal, extension
       or refunding of any liability of such Person of the types referred to
       in clauses (1) through (9) above,

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if, and to the extent, any of the foregoing would appear as a liability upon a
balance sheet of such Person prepared in accordance with GAAP.

   For purposes hereof, the "maximum fixed repurchase price" of any
Disqualified Stock which does not have a fixed repurchase price shall be
calculated in accordance with the terms of such Disqualified Stock as if such
Disqualified Stock were purchased on any date on which Indebtedness shall be
required to be determined pursuant to the indenture, and if such price is based
upon, or measured by, the fair market value of such Disqualified Stock, such
fair market value to be determined in the good faith judgment of the Board of
Directors of the issuer of such Disqualified Stock, provided, however, that if
such Disqualified Stock is not at the date of determination permitted or
required to be repurchased, the "maximum fixed repurchase price" shall be the
book value of such Disqualified Stock. Subject to clause (7) of the first
sentence of this definition, neither Dollar-Denominated Production Payments nor
Volumetric Production Payments shall be deemed to be Indebtedness.

   The amount of any Indebtedness outstanding as of any date shall be:

  (1) the accreted value thereof, in the case of any Indebtedness issued with
      original issue discount; and

  (2) the principal amount thereof, together with any interest thereon that
      is more than 30 days past due, in the case of any other Indebtedness.

   "Interest Expense" of any Person means, for any period, the aggregate amount
of interest expense of such Person (including without limitation or duplication
(1) amortization of debt issuance expense, (2) amortization of original issue
discount on any Indebtedness and (3) the interest portion of any deferred
payment obligation, all commissions, discounts and other fees and charges owed
with respect to letters of credit and bankers acceptance financings and the net
cost under Hedging Obligations) paid, accrued or scheduled to be paid or
accrued by such Person during such period, in each case determined in
accordance with GAAP.

   "Investment" means, with respect to any Person, any direct or indirect
advance, loan, guarantee of Indebtedness or other extension of credit or
capital contribution to (by means of any transfer of cash or other property or
assets to others or any payment for property, assets or services for the
account or use of others), or any purchase or acquisition by such Person of any
Capital Stock, bonds, notes, debentures or other securities (including
derivatives) or evidences of Indebtedness issued by, any other Person
(excluding commission, payroll, travel, employee transfer assistance loans and
similar loans and advances to directors, officers, employees, consultants and
stockholders made in the ordinary course of business). In addition, the fair
market value of the net assets of any Restricted Subsidiary at the time that
such Restricted Subsidiary is designated an Unrestricted Subsidiary shall be
deemed to be an "Investment" made by Western in such Unrestricted Subsidiary at
such time. "Investments" shall exclude (1) extensions of trade credit in the
ordinary course of business, (2) Hedging Obligations entered into in the
ordinary course of business or as required by any Permitted Indebtedness or any
Indebtedness incurred in compliance with the covenant described above under the
caption "--Certain Covenants--Incurrence of Indebtedness," and (3) bonds,
notes, debentures or other securities received in compliance with the covenant
described under the caption "Repurchase at Option of holders--Asset
Disposition."

   "Issue Date" means the date notes are first issued under the indenture.

   "Lien" means, with respect to any asset, any mortgage, lien, pledge, charge,
security interest or encumbrance of any kind (except for taxes not yet owing)
in respect of such asset, whether or not filed, recorded or otherwise perfected
under applicable law, including any conditional sale or other title retention
agreement, any lease in the nature thereof, any option or other agreement to
sell or give a security interest in and any filing of or agreement to give any
financing statement under the Uniform Commercial Code (or equivalent statutes)
of any jurisdiction.

   "Moody's" means Moody's Investors Service, Inc. and its successors.


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<PAGE>

   "Net Available Proceeds" means cash or readily marketable Cash Equivalents
received by Western or any of its Restricted Subsidiaries in respect of an
Asset Disposition (including by way of sale or discounting of a note,
installment receivable or other receivable, but excluding any other
consideration received in the form of assumption by the acquiree of
Indebtedness or other obligations relating to such properties or assets or
received in any other noncash form) net of (1) all legal and accounting
expenses, commissions, investment banking fees and other fees and expenses
incurred and all federal, state, provincial, foreign and local taxes paid or
payable or required to be accrued as a liability as a consequence of such
transaction, and (2) all payments made by such Person or its Restricted
Subsidiaries on any Indebtedness which must, in order to obtain a necessary
consent to such transaction or by applicable law, be repaid out of the proceeds
from such transaction.

   "Non-Recourse Debt" means Indebtedness:

  (1) as to which neither Western nor any of its Restricted Subsidiaries (a)
      provides credit support of any kind (including any undertaking,
      agreement or instrument that would constitute Indebtedness), (b) is
      directly or indirectly liable as a guarantor or otherwise, or (c)
      constitutes the lender;

  (2) no default with respect to which (including any rights that the holders
      thereof may have to take enforcement action against any Unrestricted
      Subsidiary) would permit upon notice, lapse of time or both any holder
      of any other Indebtedness (other than the notes) of Western or any of
      its Restricted Subsidiaries to declare a default on such other
      Indebtedness or cause the payment thereof to be accelerated or payable
      prior to its stated maturity; and

  (3) as to which the lenders have been notified in writing that they will
      not have any recourse to the stock or assets of Western or any of its
      Restricted Subsidiaries.

   "Obligations" means any principal (and premium, if any), interest, letter of
credit deposits and reimbursements, penalties, fees, indemnifications,
reimbursements, costs, expenses, yield maintenance amounts, damages and all
other liabilities payable under the documentation governing any Indebtedness.

   "Officers' Certificate" means a certificate delivered to the trustee signed
by the Chairman, the President, a Vice President or the Chief Financial
Officer, and by the Treasurer, an Assistant Treasurer, the Secretary or an
Assistant Secretary of Western.

   "Opinion of Counsel" means a written opinion of legal counsel for Western
(or any Guarantor, if applicable) including an employee of Western (or any
Guarantor, if applicable), who is reasonably acceptable to the trustee.

   "Permitted Business Investments" means Investments in a Person of a nature
that is or shall become customary in the Principal Business as a means of
actively exploiting, exploring for, acquiring, developing, processing,
gathering, treating, marketing or transporting oil, gas and natural gas liquids
through agreements, transactions, interests or arrangements which permit one to
share risks or costs, comply with regulatory requirements regarding local
ownership or satisfy other objectives customarily achieved through the conduct
of the Principal Business jointly with third parties, including without
limitation,

  (1) ownership interests in oil and gas properties, processing facilities,
      gathering systems or ancillary real property interests, and

  (2) Investments in the form of or pursuant to operating agreements,
      processing agreements, farm-in agreements, farm-out agreements,
      development agreements, area of mutual interest agreements, utilization
      agreements, pooling agreements, joint bidding agreements, service
      contracts, joint venture agreements, partnership agreements,
      subscription agreements, stock purchase agreements and other similar
      agreements with third parties,

provided that with respect to such Investment

  (1) the investing Person receives and maintains at least 50% of the Voting
      Stock in such Person and is allocated and continues to receive at least
      50% of the profits, losses and distributions of such Person,

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  (2) the Person in which the Investment is made shall not, directly or
      indirectly, create, incur, issue, assume, guarantee or otherwise become
      directly or indirectly liable, contingently or otherwise, with respect
      to any Indebtedness (including Acquired Debt),

  (3) the Person in which the Investment is made shall not, directly or
      indirectly, create or permit to exist or become effective any
      consensual encumbrance or restriction on the ability of such Person to

    (a) pay dividends, in cash or otherwise, or make any other
        distributions on its Capital Stock or pay any Indebtedness owed to
        holders of its Capital Stock,

    (b) make loans or advances to holders of its Capital Stock, or

    (c) transfer any of its properties or assets to holders of its Capital
        Stock, and

  (4) such Investment, when aggregated with all other outstanding or existing
      Permitted Business Investments at the time of such Investment, does not
      exceed 30% of Total Assets. All Permitted Business Investments will be
      valued at their fair market value at the time of such classification as
      determined in the good faith judgment of the Board of Directors.

   Notwithstanding the above, the restrictions set forth in clause (3) above
will not apply to encumbrances or restrictions existing under or by reason of:

  (1) applicable laws, rules, regulations and/or orders;

  (2) customary non-assignment provisions in leases entered into in the
      ordinary course of business and consistent with past practices; or

  (3) any merger agreements, stock purchase agreements, asset sale agreements
      and similar agreements limiting the transfer of properties and assets
      or distributions pending consummation of the subject transactions;
      provided, that all of the consideration received in such transaction is
      in the form of cash or Cash Equivalents (which shall include any
      securities, notes or other obligations received from the transferee
      that are converted into cash or Cash Equivalents within 120 days of the
      consummation of such transaction), and the consideration shall be
      deemed to be Net Available Proceeds and applied in accordance with "--
      Repurchase at Option of holders--Asset Disposition."

   "Permitted Investments" means:

  (1) any Investment in Western or in a Restricted Subsidiary of Western;

  (2) any Investment in Cash Equivalents;

  (3) any Investment by Western or any Restricted Subsidiary of Western in a
      Person, if as a result of such Investment:

    (a) such Person becomes a Restricted Subsidiary of Western; or

    (b) such Person is merged, consolidated or amalgamated with or into, or
        transfers or conveys substantially all of its assets to, or is
        liquidated into, Western or a Restricted Subsidiary of Western;

  (4) any Investment made as a result of the receipt of non-cash
      consideration from an Asset Disposition that was made pursuant to and
      in compliance with the covenant described above under the caption "--
      Repurchase at Option of holders--Asset Disposition;"

  (5) any acquisition of assets solely in exchange for the issuance of
      Capital Stock (other than Disqualified Stock) of Western;

  (6) Permitted Business Investments;

  (7) entry into any arrangement pursuant to which Western or any of its
      Restricted Subsidiaries may incur Hedging Obligations;

  (8) loans or advances to officers, directors or employees of Western or any
      Subsidiary of Western for purposes of purchasing Western's Common Stock
      in an aggregate amount outstanding at any one

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      time not to exceed $5.0 million and other loans and advances (including
      without limitation loans for relocation costs) to such officers,
      directors or employees in the ordinary course of business of Western or
      its Restricted Subsidiaries;

  (9) stock, obligations or securities received in settlement of debts
      created in the ordinary course of business and owing to Western or any
      of its Restricted Subsidiaries or in satisfaction of judgments or
      claims;

  (10) Investments in connection with pledges, deposits, payments or
       performance bonds made or given in the ordinary course of business in
       connection with or to secure statutory, regulatory or similar
       obligations, including obligations under health, safety or
       environmental obligations; and

  (11) Investments in securities of trade creditors or customers received in
       settlement of obligations or pursuant to any plan of reorganization or
       similar arrangement upon the bankruptcy or insolvency of such trade
       creditors of customers.

   "Permitted Junior Securities" means Capital Stock (and all warrants,
options or other rights to acquire Capital Stock) of Western or debt
securities that are subordinated to the notes (and any debt securities issued
in exchange for Senior Debt) to substantially the same extent as, or to a
greater extent than, the notes are subordinated to Senior Debt pursuant to the
indenture.

   "Permitted Liens" means the following types of Liens:

  (1) Liens existing as of the Issue Date;

  (2) Liens, if any, securing the notes;

  (3) Liens in favor of Western or a Restricted Subsidiary;

  (4) Liens securing Senior Debt or Guarantor Senior Debt;

  (5) Liens for taxes, assessments and governmental charges or claims that
      are either (a) not delinquent or (b) being contested in good faith by
      appropriate proceedings and as to which Western or a Restricted
      Subsidiary of Western shall have set aside on its books such reserves
      or provisions, if any, as may be required pursuant to GAAP;

  (6) statutory Liens of landlords and Liens of carriers, warehousemen,
      mechanics, suppliers, materialmen, and repairmen that are either (a)
      Liens imposed by law incurred in the ordinary course of business for
      sums not delinquent or (b) being contested in good faith, if in the
      case of this clause (b), Western or a Restricted Subsidiary shall have
      set aside on its books such reserves or provisions, if any, as may be
      required pursuant to GAAP;

  (7) Liens incurred and deposits made in the ordinary course of business in
      connection with workers' compensation, unemployment insurance and other
      types of social security, and Liens incurred and deposits made to
      secure the payment or performance of tenders, statutory or regulatory
      obligations, surety and appeal bonds, leases, government contracts and
      leases, trade contracts (other than to secure an obligation for
      borrowed money), performance and return of money bonds and other
      similar obligations (exclusive of obligations for the payment of
      borrowed money but including lessee and operator obligations under
      statutes, governmental regulations or instruments related to the
      ownership, exploration and production of oil, gas and minerals on
      state, federal or foreign lands or waters);

  (8) pre-judgment Liens and judgment Liens not giving rise to an event of
      default so long as any appropriate legal proceedings which may have
      been duly initiated for the review of such judgment shall not have been
      finally terminated or the period within which such proceedings may be
      initiated shall not have expired;

  (9) any interest or title of a lessor under any lease whether or not
      characterized as a capital or operating lease;


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  (10) Liens resulting from the deposit of funds or evidences of Indebtedness
       in trust for the purpose of defeasing Indebtedness of Western or any
       of its Subsidiaries; customary Liens for the fees, costs and expenses
       of trustees and escrow agents pursuant to the indenture, escrow
       agreement or other similar agreement establishing such trust or escrow
       arrangement; and Liens pursuant to merger agreements, stock purchase
       agreements, asset sale agreements and similar agreements (a) limiting
       the transfer of properties and assets pending consummation of the
       subject transaction or (b) in respect of earnest money deposits, good
       faith deposits, purchase price adjustment escrows or similar deposits
       or escrow arrangements made or established thereunder;

  (11) Liens securing any Hedging Obligations of Western or any Restricted
       Subsidiary;

  (12) Liens securing reimbursement obligations with respect to letters of
       credit which encumber documents and other property relating to such
       letters of credit and products and proceeds thereof;

  (13) Liens encumbering property or assets under construction arising from
       progress or partial payments by a customer of Western or its
       Restricted Subsidiaries relating to such property or assets and Liens
       to secure Indebtedness used to finance all or a part of the
       construction of property or assets used by Western or any of its
       Restricted Subsidiaries in their Principal Business; provided, that
       such Liens do not extend to any other property or assets owned by
       Western or its Restricted Subsidiaries;

  (14) Liens on, or related to, properties or assets to secure all or part of
       the costs incurred in the ordinary course of business for the
       exploration, drilling, development or operation thereof;

  (15) Liens on pipeline or pipeline facilities which arise out of operation
       of law;

  (16) Liens arising under operating agreements, joint venture agreements,
       partnership agreements, oil and gas leases, farm-out agreements,
       division orders, contracts for the sale, purchase, transportation,
       processing or exchange of oil, gas or other hydrocarbons, unitization
       and pooling declarations and agreements, area of mutual interest
       agreements, development agreements, joint ownership arrangements and
       other agreements which are customary in the Principal Business other
       than any Indebtedness with respect to a Permitted Business Investment;

  (17) Liens constituting survey exceptions, encumbrances, easements, or
       reservations of, or right to others for, rights-of-way, zoning
       restrictions and other similar charges and encumbrances as to the use
       of real properties, and minor defects of title which, in the case of
       any of the foregoing, were not incurred or created to secure the
       payment of borrowed money or the deferred purchase price of property,
       assets or services, and in the aggregate do not interfere in any
       material respect with the ordinary conduct of the business of Western
       or its Restricted Subsidiaries;

  (18) rights reserved to or vested in any municipality or governmental,
       statutory or public authority by the terms of any right, power,
       franchise, grant, license or permit, or by any provision of law, to
       terminate such right, power, franchise, grant, license or permit or to
       purchase, condemn, expropriate or recapture or to designate a
       purchaser of any of the property of such Person; rights reserved to or
       vested in any municipality or governmental, statutory or public
       authority to control or regulate any property of such Person, or to
       use such property in a manner which does not materially impair the use
       of such property for the purposes for which it is held by such Person;
       any obligation or duties affecting the property of such Person to any
       municipality or governmental, statutory or public authority with
       respect to any franchise, grant, license or permit;

  (19) Liens securing Non-Recourse Debt; provided, however, that the related
       Non-Recourse Debt shall not be secured by any property or assets of
       Western or any Restricted Subsidiary of Western other than the
       property and assets acquired by Western or such Restricted Subsidiary
       with the proceeds of such Non-Recourse Debt;

  (20) Liens on property of a Person existing at the time such Person is
       merged with or into or consolidated with Western or any Guarantor;
       provided that such Liens were in existence prior to the contemplation
       of such merger or consolidation and do not extend to any assets other
       than those of the Person merged into or consolidated with Western or
       the Guarantor;


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  (21) Liens on property existing at the time of acquisition thereof by
       Western or any Guarantor, provided that such Liens were in existence
       prior to the contemplation of such acquisition;

  (22) Liens securing Permitted Refinancing Indebtedness incurred to extend,
       refinance, renew, replace, defease or refund secured Indebtedness
       where both the Liens securing the Indebtedness being refinanced were
       permitted under the indenture and the Liens securing the Permitted
       Refinancing Indebtedness only encumber assets and properties
       encumbered under Liens securing the Indebtedness so extended,
       refinanced, renewed, replaced, deferred or refunded; and

  (23) Liens arising out of the refinancing, extension, renewal or refunding
       of any Indebtedness permitted by this indenture that is secured by any
       Lien permitted by (1) through (22) above.

Notwithstanding anything in clauses (1) through (23) of this definition, the
term "Permitted Liens" does not include any Liens resulting from the creation,
incurrence, issuance, assumption or guarantee of any Production Payments other
than Production Payments that are created, incurred, issued, assumed or
guaranteed in connection with the financing of, and within 30 days after, the
acquisition of the properties or assets that are subject thereto.

   "Permitted Refinancing Indebtedness" means any Indebtedness of Western or
any of its Restricted Subsidiaries issued in exchange for, or the net proceeds
of which are used to extend, refinance, renew, replace, defease or refund other
Indebtedness of Western or any of its Restricted Subsidiaries (other than
intercompany Indebtedness); provided that:

  (1) the principal amount (or accreted value or liquidation value, if
      applicable) of such Permitted Refinancing Indebtedness does not exceed
      the principal amount of (or accreted value or liquidation value, if
      applicable), plus accrued interest and accumulated dividends on, the
      Indebtedness so extended, refinanced, renewed, replaced, defeased or
      refunded (plus the amount of expenses, costs or premiums incurred in
      connection therewith);

  (2) such Permitted Refinancing Indebtedness has a final maturity date that
      is the same as or later than the final maturity date of, and has a
      Weighted Average Life to Maturity equal to or greater than the Weighted
      Average Life to Maturity of, the Indebtedness being extended,
      refinanced, renewed, replaced, defeased or refunded;

  (3) if the Indebtedness being extended, refinanced, renewed, replaced,
      defeased or refunded is subordinated in right of payment to the notes,
      such Permitted Refinancing Indebtedness has a final maturity date that
      is the same as or later than the final maturity date of, and is
      subordinated in right of payment to, the notes on terms at least as
      favorable, in all material respects, taken as a whole (as determined in
      the good faith judgment of the Board of Directors of Western or a
      Restricted Subsidiary of Western, as the case may be), to the holders
      of notes as those contained in the documentation governing the
      Indebtedness being extended, refinanced, renewed, replaced, defeased or
      refunded;

  (4) such Indebtedness is incurred or issued either by Western or by the
      Restricted Subsidiary which is the obligor on or issuer of the
      Indebtedness being extended, refinanced, renewed, replaced, defeased or
      refunded; and

  (5) if the Indebtedness being extended, refinanced, renewed, replaced,
      defeased or refunded provided for payment or accrual of interest or
      dividends on a non-cash basis, then such Indebtedness contains
      provisions allowing for the payment or accrual of interest and
      dividends on comparable terms.

   "Person" means any individual, corporation, partnership, joint venture,
association, joint stock company, trust, estate, unincorporated organization or
government or any agency or political subdivision thereof or any other entity.

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   "Principal Business" means

  (1) the gathering, marketing, treating, processing, storage, selling and
      transporting of any natural gas and its components including NGLs,

  (2) any business relating to or arising from the acquisition, development,
      production, treatment, processing, storage, refining, transportation,
      distribution or marketing of oil, gas, electricity and other minerals
      and products produced in association therewith,

  (3) the acquisition, exploration, exploitation, development, operation and
      disposition of interests in oil, gas and other hydrocarbon properties,
      and

  (4) any activity necessary, appropriate or incidental to the activities
      described in the foregoing clauses (1) through (3) of this definition.

   "Principal" means any of Brion Wise, Walter Stonehocker, Ward Sauvage, Dean
Phillips and Bill Sanderson.

   "Production Payments" means, collectively, Dollar-Denominated Production
Payments and Volumetric Production Payments.

   "Public Equity Offering" means any underwritten public offering of Capital
Stock of Western pursuant to a registration statement (other than a Form S-8 or
any other form relating to securities under any employee benefit plan of
Western) that is declared effective by the Commission after the Issue Date in
which the gross proceeds to Western are at least $20.0 million.

   "Required holders" means, with respect to any series of Western's Designated
Senior Debt, at any time the holders of the required percentage of the
aggregate principal amount outstanding as defined in each of the Senior Debt
Agreements.

   "Restricted Investment" means an Investment other than a Permitted
Investment.

   "Restricted Subsidiary" of a Person means any Subsidiary of the referent
Person that is not an Unrestricted Subsidiary.

   "Revolving Credit Facility" means the Loan Agreement, dated April 29, 1999,
by and among Western and Nationsbank, N.A., as agent, and the lender parties
thereto, as amended and restated from time to time, and all notes, guarantees,
collateral documents and other instruments and agreements executed and
delivered pursuant thereto, as amended and restated from time to time.

   "S&P" means Standard & Poor's Rating Services and its successors.

   "Sale/Leaseback Transaction" means, with respect to any Person, any direct
or indirect arrangements pursuant to which properties or assets are sold or
transferred by such Person or a Subsidiary of such Person and are thereafter
leased back from the purchaser or transferee by such Person or one of its
Subsidiaries; provided, however, Sale/Leaseback Transactions shall not include
transactions whereby property or assets are sold or transferred by Western or
any of its Restricted Subsidiaries to any Affiliate of Western or pursuant to
any Permitted Investment constituting a joint ownership arrangement, which
property or assets are leased back, directly or indirectly, to Western, any
Affiliate of Western or to the constituent parties to any such joint venture
arrangement.

   "Senior Debt" when used with respect to Western means:

  (1) all Indebtedness outstanding under the Senior Debt Agreements
      (including interest after the commencement of any bankruptcy or
      insolvency proceeding at the rate specified in the applicable Senior
      Debt Agreement) and all Hedging Obligations with respect thereto;

                                       98
<PAGE>

  (2) any other Indebtedness permitted to be incurred by Western under the
      terms of the indenture, unless the instrument under which such
      Indebtedness is incurred expressly provides that it is on a parity with
      the notes or subordinated in right of payment to the notes or any other
      Indebtedness of Western; and

   Notwithstanding anything to the contrary in the preceding, Senior Debt will
not include:

  (1) any liability for federal, state, local or other taxes owed or owing by
      Western;

  (2) any Indebtedness of Western to any of its Subsidiaries or other
      Affiliates;

  (3) any trade payables;

  (4) any Indebtedness that is incurred in violation of the indenture;

  (5) any Indebtedness represented by preferred stock; or

  (6) any Indebtedness evidenced by the notes.

   Any purchaser of Senior Debt incurred after the date of this indenture shall
be entitled to rely on a certificate of Western's Chief Financial Officer that
the Senior Debt has been incurred in accordance with the covenant contained
under "--Certain Covenants--Incurrence of Indebtedness" in order to qualify as
Senior Debt.

   "Senior Debt Agreements" means, collectively:

  (1) the Loan Agreement, dated April 29, 1999, by and among Western and
      NationsBank, N.A., as agent, and the lender parties thereto, as amended
      and restated from time to time, and all notes, guarantees, collateral
      documents and other instruments and agreements executed and delivered
      pursuant thereto, as amended and restated from time to time;

  (2) the Second Amended and Restated Master Shelf Agreement, dated as of
      December 19, 1991, by and between Western and The Prudential Insurance
      Company of America, as amended and restated from time to time, and all
      notes, guarantees, collateral documents and other instruments and
      agreements executed and delivered pursuant thereto, as amended and
      restated from time to time; and

  (3) the Amended and Restated Note Purchase Agreement, dated as of April 28,
      1999, by and among Western, American General Life Insurance Company and
      the other note purchasers party thereto, as amended and restated from
      time to time, and all notes, guarantees, collateral documents and other
      instruments and agreements executed and delivered pursuant thereto, as
      amended and restated from time to time.

   "Significant Subsidiary" means any Subsidiary that would be a "significant
subsidiary" as defined in Article 1, Rule 1-02 of Regulation S-X, promulgated
pursuant to the Securities Act, as such Regulation is in effect on the date
hereof.

   "Special Interest" means any additional interest on the notes that is
required to be paid to the holders of the notes under the terms of the exchange
and registration rights agreement.

   "Stated Maturity" means, with respect to any installment of interest or
principal on any series of Indebtedness, the date on which such payment of
interest or principal was scheduled to be paid in the original documentation
governing such Indebtedness, and shall not include any contingent obligations
to repay, redeem or repurchase any such interest or principal prior to the date
originally scheduled for the payment thereof.

   "Subsidiary" means, with respect to any Person:

  (1) any corporation, association or other business entity of which more
      than 50% of the Voting Stock is at the time owned or controlled,
      directly or indirectly, by such Person or one or more of the other
      Subsidiaries of that Person (or a combination thereof); and

  (2) any partnership (a) the sole general partner or the managing general
      partner of which is such Person or a Subsidiary of such Person or (b)
      the only general partners of which are such Person or of one or more
      Subsidiaries of such Person (or any combination thereof).


                                       99
<PAGE>

   Notwithstanding the foregoing, any Person invested in or created as a result
of a Permitted Business Investment by Western or any of its Subsidiaries shall
be deemed to be a Subsidiary for purposes of the indenture.

   "Total Assets" means the total consolidated assets of Western and its
Restricted Subsidiaries, as shown on the most recent balance sheet of Western.

   "Transaction Date" means the date on which Indebtedness giving rise to the
need to calculate the Consolidated Operating Cash Flow Ratio was incurred or
the date on which, pursuant to the terms of the indenture, the transaction
giving rise to the need to calculate the Consolidated Operating Cash Flow Ratio
occurred.

   "Trust Indenture Act" means the Trust Indenture Act of 1939 as in force at
the Issue Date; provided, however, that in the event the Trust Indenture Act of
1939 is amended after such date, "Trust Indenture Act" means, to the extent
required by any such amendment, the Trust Indenture Act of 1939 as so amended.

   "Unrestricted Subsidiary" means any Subsidiary of Western that is designated
by the Board of Directors of Western as an Unrestricted Subsidiary pursuant to
a resolution, but only to the extent that such Subsidiary:

  (1) has no Indebtedness other than Non-Recourse Debt;

  (2) is not party to any agreement, contract, arrangement or understanding
      with Western or any Restricted Subsidiary of Western unless the terms
      of any such agreement, contract, arrangement or understanding are not
      less favorable to Western or such Restricted Subsidiary than those that
      might be obtained at the time from Persons who are not Affiliates of
      Western;

  (3) is a Person with respect to which neither Western nor any of its
      Restricted Subsidiaries has any direct or indirect obligation (a) to
      subscribe for additional Capital Stock (including options, warrants or
      other rights to acquire Capital Stock) or (b) to maintain or preserve
      such Person's financial condition or to cause such Person to achieve
      any specified levels of operating results; and

  (4) has not guaranteed or otherwise directly or indirectly provided credit
      support for any Indebtedness of Western or any of Western's Restricted
      Subsidiaries.

   Any designation of a Subsidiary of Western as an Unrestricted Subsidiary
shall be evidenced to the trustee by filing with the trustee a certified copy
of the resolution of the Board of Directors of Western giving effect to such
designation and an Officers' Certificate certifying that such designation
complied with the preceding conditions and was permitted by the covenant
described above under the caption "--Certain Covenants--Restricted Payments."
If, at any time, any Unrestricted Subsidiary would fail to meet the preceding
requirements as an Unrestricted Subsidiary, it shall thereafter cease to be an
Unrestricted Subsidiary for purposes of the indenture and any Indebtedness of
such Subsidiary shall be deemed to be incurred by a Restricted Subsidiary of
Western as of such date and, if such Indebtedness is not permitted to be
incurred as of such date under the covenant described under the caption "--
Certain Covenants--Incurrence of Indebtedness," Western shall be in default of
such covenant. The Board of Directors of Western may, at any time, designate
any Unrestricted Subsidiary to be a Restricted Subsidiary; provided that such
designation shall be deemed to be an incurrence of Indebtedness by a Restricted
Subsidiary of Western of any outstanding Indebtedness of such Unrestricted
Subsidiary and such designation shall only be permitted if (1) such
Indebtedness is permitted under the covenant described under the caption "--
Certain Covenants--Incurrence of Indebtedness," calculated on a pro forma basis
as if such designation had occurred at the beginning of the four-quarter
reference period; and (2) no Default or event of default would be in existence
following such designation.

   "Volumetric Production Payments" means production payment obligations
recorded as deferred revenue in accordance with GAAP, together with all
undertakings and obligations in connection therewith.

   "Voting Stock" of any Person as of any date means the Capital Stock of such
Person that is at the time entitled to vote in the election of the Board of
Directors, managers or trustees of such Person.

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<PAGE>

   "Weighted Average Life to Maturity" means, when applied to any Indebtedness
at any date, the number of years obtained by dividing;

  (1) the sum of the products obtained by multiplying (a) the amount of each
      then remaining installment, sinking fund, serial maturity or other
      required payments of principal or redemption amount, including payment
      at final maturity, in respect thereof, by (b) the number of years
      (calculated to the nearest one-twelfth) that will elapse between such
      date and the making of such payment, by

  (2) the then outstanding principal amount or liquidation preference of such
      Indebtedness.

   "Wholly Owned Restricted Subsidiary" of any Person means a Restricted
Subsidiary of such Person all of the outstanding Capital Stock or other
ownership interests of which (other than directors' qualifying shares) shall at
the time be owned by such Person and/or by one or more Wholly Owned Restricted
Subsidiaries of such Person.

Book-Entry; Delivery and Form

   The exchange notes exchanged for old notes through the Book-Entry Transfer
Facility will be represented by a global note (the "new global note"). One new
global note shall be issued with respect to each $100 million or less in
aggregate principal amount at maturity of the new global note. The new global
note will be issued on the date of the closing of the exchange offer with the
trustee, as custodian of DTC, pursuant to a FAST Balance Certificate Agreement
between the trustee and DTC and registered in the name of Cede & Co., as
nominee of DTC.

   Exchange notes exchanged for old notes which are in the form of registered
definitive certificates (the "certificated notes") will be issued in the form
of certificated notes. Such certificated notes may, unless the new global note
has previously been exchanged for certificated notes, be exchanged for an
interest in the new global note representing the principal amount of exchange
notes being transferred.

   The Global Notes. We expect that pursuant to procedures established by DTC
(i) upon the issuance of the new global notes, DTC or its custodian will
credit, on its internal system, the principal amount of the individual
beneficial interests represented by such new global notes to the respective
accounts of persons who have accounts with DTC ("participants") and (ii)
ownership of beneficial interests in the new global notes will be shown on, and
the transfer of such ownership will be effected only through, records
maintained by DTC or its nominee (with respect to interests of participants).

   So long as DTC, or its nominee, is the registered owner or holder of the
exchange notes, DTC or such nominee, as the case may be, will be considered the
sole owner or holder of the notes represented by such new global notes for all
purposes under the indenture. No beneficial owner of an interest in any of the
new global notes will be able to transfer that interest except in accordance
with DTC's procedures, in addition to those provided for under the indenture
with respect to the exchange of notes and, if applicable, those of Euroclear or
Cedel Bank.

   Payments of the principal, premium (if any) and interest on the new global
notes will be made to DTC or its nominee, as the case may be, as the registered
owner thereof. None of Western, the trustee or any Paying Agent will have any
responsibility or liability for any aspect of the records relating to or
payments made on account of beneficial ownership interests in the new global
notes or for maintaining, supervising or reviewing any records relating to such
beneficial ownership interest.

   We expect that DTC or its nominee, upon receipt of any payment of principal,
premium, if any, or interest in respect of the new global notes, will credit
participants' accounts with payments in amounts proportionate to their
respective beneficial interests in the principal amount of the new global notes
as shown on the records of DTC or its nominee. We also expect that payments by
participants to owners of beneficial interests in the new global notes held
through the participants will be governed by standing instructions and
customary practice, as

                                      101
<PAGE>

is now the case with securities held for the accounts of customers registered
in the names of nominees for those customers. These payments will be the
responsibility of the participants.

   Transfers between participants in DTC will be effected in the ordinary way
through DTC's same day funds system in accordance with DTC rules and will be
settled in same day funds. If a holder requires physical delivery of a
certificated note for any reason, including to sell notes to persons in states
which require physical delivery of the notes, or to pledge such securities,
such holder must transfer its interest in participants to whose account the DTC
interests in the new global notes are credited and only in respect of that
portion of the aggregate principal amount of notes as to which that participant
or participants has or have given such direction. However, if there is an event
of default under the indenture, DTC will exchange the new global notes for
certificated notes, which it will distribute to its participants and which will
be legended as set forth under the heading "Notice to Investors." Transfers
between participants in Euroclear and Cedel Bank will be effected in the
ordinary way in accordance with their respective rules and operating
procedures.

   DTC has advised us as follows: DTC is a limited purpose trust company
organized under the laws of the State of New York, a member of the Federal
Reserve System, a "clearing corporation" within the meaning of the Uniform
Commercial Code and a "Clearing Agency" registered pursuant to the provisions
of Section 17A of the Exchange Act. DTC was created to hold securities for its
participants and facilitate the clearance and settlement of securities
transactions between participants through electronic book-entry changes in
accounts of its participants, thereby eliminating the need for physical
movement of certificates. Participants include securities brokers and dealers,
banks, trust companies and clearing corporations and certain other
organizations. Indirect access to the DTC system is available to others such as
banks, brokers, dealers and trust companies that clear through or maintain a
custodial relationship with a participant, either directly or indirectly
("indirect participants").

   Although DTC, Euroclear and Cedel Bank have agreed to the foregoing
procedures in order to facilitate transfers of interests in the Global notes
among participants of DTC, Euroclear and Cedel Bank they are under no
obligation to perform these procedures, and these procedures may be
discontinued at any time. Neither we nor the trustee will have any
responsibility for the performance by DTC, Euroclear or Cedel Bank or their
participants or indirect participants of their respective obligations under the
rules and procedures governing their operations.

   Certificated Notes. If we deliver to the trustee written notice from DTC
that it is unwilling or unable to continue to act as Depository or that it is
no longer a clearing agency registered under the Exchange Act and, in either
case, a successor Depository is not appointed by us within 120 days after the
date of such notice from DTC or we in our sole discretion determine that the
Global Securities (in whole but not in part) should be exchanged for Definitive
Securities and deliver a written notice to such effect to the trustee,
certificated notes will be issued in exchange for the new global notes.

             CERTAIN UNITED STATES FEDERAL INCOME TAX CONSEQUENCES

General

   The following is a summary of material U.S. federal income tax consequences
associated with the exchange of old notes for exchange notes and the ownership
and disposition of those notes applicable to you if you acquired the old notes
in the initial offer and, for U.S. federal income tax purposes, you are not a
"United States person" as defined below (a "Non-U.S. holder"). This summary is
based upon current U.S. federal income tax laws, regulations, rulings, and
judicial decisions, as discussed below under the caption "Exchange Offer,"
which discusses the U.S. federal income tax treatment to all holders of old
notes all of which are subject to change, possibly retroactively. This summary
does not discuss all aspects of U.S. federal income taxation which may be
important to you in light of your individual investment circumstances, for
example, if you are an investor subject to special tax rules (e.g., if you are
a bank, thrift, real estate investment trust, regulated investment company,
insurance company, dealer in securities or currencies, expatriate or tax-exempt

                                      102
<PAGE>

investor) or if you will hold notes as a position in a "straddle," as part of a
"synthetic security" or "hedge", as part of a "conversion transaction" or other
integrated investment, or as other than a capital asset. In addition, this
summary does not address any aspect of state, local or foreign taxation.

   You are urged to consult your tax advisors concerning the particular tax
consequences to you of acquiring, owning and disposing of the notes in light of
your particular tax and investment situation and the particular state, local
and foreign income and other tax laws.

   For purposes of this summary, a "United States person" means a beneficial
owner of a Note that is for U.S. federal income tax purposes:

  . an individual who is a citizen or resident of the United States for U.S.
    federal income tax purposes;

  . a corporation, partnership or other entity created or organized in the
    United States or under the laws of the United States or any state thereof
    (including the District of Columbia);

  . an estate the income of which is includible in gross income for U.S.
    income tax purposes regardless of its source; or

  . a trust if a court within the United States is able to exercise primary
    supervision over the administration of such trust and one or more United
    States persons have the authority to control all substantial decisions of
    such trust.

   A "Non-U.S. holder" means a holder of a note that is not a U.S. holder. The
following summary applies to you only if you are a Non-U.S. holder.

Exchange Offer

   The exchange of outstanding notes for the notes issued in the exchange offer
will not be treated as an "exchange" for United States federal income tax
purposes because the notes issued in the exchange offer will not differ
materially in kind or extent from the outstanding notes. Rather, the notes
received by you in the exchange offer will be treated as a continuation of the
outstanding notes owned by you. As a result, there will be no federal income
tax consequences to you. In addition, you will have the same adjusted tax basis
and holding period in the notes issued in the exchange offer as you had in the
outstanding notes immediately prior to the exchange.

Payments of Interest to non-U.S. Holders

   Subject to the discussion of backup withholding below, payments of interest
on a note to you generally will not be subject to U.S. federal income or
withholding tax, provided that

  (1) you:

    . do not actually or constructively own 10% or more of the total
      combined voting power of all classes of stock of the Company entitled
      to vote, and

    . are not a controlled foreign corporation that is related to the
      Company actually or constructively through stock ownership for United
      States federal income tax purposes;

  (2) such interest payments are not effectively connected with the conduct
      by you of a trade or business within the United States; and

  (3) we or our paying agent receives:

    . from you, a properly completed Form W-8 (or substitute Form W-8)
      signed under penalties of perjury which provides your name and
      address and certifies that you are a Non-U.S. holder, or

    . from a security clearing organization, bank or other financial
      institution that holds the notes in the ordinary course of its trade
      or business (a "financial institution") on behalf of you,
      certification under penalties of perjury that such Form W-8 (or
      substitute Form W-8) has been received by it, or by another such
      financial institution, from you, and a copy of the Form W-8 (or
      substitute Form W-8) is furnished to us or our paying agent.


                                      103
<PAGE>

   If you do not qualify for an exemption from withholding under the preceding
paragraph, you generally will be subject to withholding of U.S federal income
tax at the rate of 30% (or a lower rate if a treaty applies) when you receive
interest on the notes.

   If you are engaged in a trade or business in the United States and interest
on the notes is effectively connected with the conduct of such trade or
business, you will not be subject to a withholding tax (assuming a proper
certification is provided) but will be subject to U.S. federal income tax on
such interest on a net income basis in the same manner as if you were a U.S.
person. In addition, if you are a foreign corporation, you may be subject to a
branch profits tax at a 30% rate (or, if applicable, a lower rate specified by
a treaty).

Sale, Exchange or Redemption of Notes by Non-U.S. Holders

   Subject to the discussion concerning backup withholding, any gain realized
by you on the sale, exchange, retirement or other disposition of a note
generally will not be subject to a U.S. federal income tax, unless (i) such
gain is effectively connected with the conduct by you of a trade of business
within the United States, or (ii) you are an individual who is present in the
United States for 183 days or more in the taxable year of the disposition and
certain other conditions are satisfied. Any such gain that is effectively
connected with the conduct of a United States trade or business by you will be
subject to United States federal income tax on a net income basis in the same
manner as if you were a United States person and, if you are a corporation,
such gain may also be subject to the 30% United States branch profits tax
described above.

Federal Estate Taxes with Respect to Non-U.S. Holders

   If you are an individual who at the time of death is not a citizen or
resident of the United States, the note held by you at the time of your death
will not be subject to United States federal estate tax, provided that (i) you
do not actually or constructively own 10% or more of the total combined voting
power of all classes of stock of the Company entitled to vote and (ii) the
interest accrued on the note was not effectively connected with your conduct of
a United States trade or business.

Backup Withholding and Information Reporting for Non-U.S. Holders

   Backup withholding and information reporting generally will not apply to
payments made to you if you provide the certification described under "Payments
of Interest" or otherwise establish an exemption from backup withholding.
Payments by a United States office of a broker of the proceeds of a disposition
of the notes generally will be subject to backup withholding at a rate of 31%
unless you certify that you are a Non-U.S. holder under penalties of perjury or
otherwise establish an exemption. Payments of the proceeds of a disposition of
the notes by or through a foreign office of a United States broker or foreign
broker with certain relationships to the United States generally will be
subject to information reporting, but not backup withholding.

   Any amount withheld from a payment to you under the backup withholding rules
is allowable as a credit against your U.S. federal income tax liability, or if
withholding results in an overpayment of taxes, a refund may be obtained,
provided that the required information is furnished to the IRS. Certain holders
(including, among others, corporations and foreign individuals who comply with
certain certification requirements) are not subject to backup withholding.

New Withholding Regulations

   The U.S. Treasury Department issued final Treasury Regulations ("New
Withholding Regulations") governing information reporting and the certification
procedures regarding withholding and backup withholding on certain amounts paid
to Non-U.S. holders after December 31, 2000. The New Withholding Regulations
generally would not alter the treatment of Non-U.S. holders described above.
The New Withholding Regulations would alter the procedures for claiming the
benefits of an income tax treaty and may change the

                                      104
<PAGE>

certification procedures relating to the receipt by intermediaries of payments
on behalf of a beneficial owner of a note. You should consult your tax advisors
concerning the effect, if any, of such New Withholding Regulations on an
investment in the notes.

                              PLAN OF DISTRIBUTION

   Each broker-dealer that receives notes for its own account in the exchange
offer must acknowledge that it will deliver a prospectus in connection with any
resale of those notes. This prospectus, as it may be amended or supplemented
from time to time, may be used by a broker-dealer in connection with resales of
exchange notes where the old notes were acquired as a result of market-making
activities or other trading activities. We have agreed that, for a period of
180 days after the consummation of the exchange offer, we will make this
prospectus, as amended and supplemented, available to any broker-dealer for use
in connection with any such resale.

   We will not receive any proceeds from any sale of exchange notes by broker-
dealers. Exchange notes received by broker-dealers for their own account under
the exchange offer may be sold from time to time in one or more transactions in
the over-the-counter market, in negotiated transactions, through the writing of
options on the notes or a combination of such methods of resale, at market
prices prevailing at the time of resale, at prices related to such prevailing
market prices or at negotiated prices. Any such resale may be made directly to
purchasers or to or through brokers or dealers who may receive compensation in
the form of commissions or concessions from any such broker-dealer or the
purchasers of any such notes. Any broker-dealer that resells notes that were
received by it for its own account in the exchange offer and any broker or
dealer that participates in a distribution of such notes may be deemed to be an
"underwriter" within the meaning of the Securities Act, and profit on any such
resale of notes issued in the exchange and any commission or concessions
received by any such persons may be deemed to be underwriting compensation
under the Securities Act. The letter of transmittal states that, by
acknowledging that it will deliver and by delivering a prospectus, a broker-
dealer will not be deemed to admit that it is an "underwriter" within the
meaning of the Securities Act.

   For a period of 180 days after the consummation of the exchange offer, we
will promptly send additional copies of this prospectus and any amendment or
supplement to this prospectus to any broker-dealer that requests such documents
in the letter of transmittal. We have agreed to pay all expenses incident to
the exchange offer, including the reasonable expenses of one counsel for the
holders of the notes, other than the commissions or concessions of any broker-
dealers, and will indemnify the holders of the old notes, including any broker-
dealers, against certain liabilities, including liabilities under the
Securities Act. We note, however, that, in the opinion of the Commission,
indemnification against liabilities arising under federal securities laws is
against public policy and may be unenforceable.

                                 LEGAL MATTERS

   The validity of the notes offered hereby will be passed upon for Western by
Skadden, Arps, Slate, Meagher & Flom LLP, New York.

                                    EXPERTS

   The estimates as of December 31, 1998 of our interests in the proved
reserves attributable to the Black Lake field included in this prospectus are
based upon a reserve report dated February 4, 1999 prepared by Williamson
Petroleum Consultants, Inc., independent petroleum consultants, and are
included herein upon the authority of such firm as experts with respect to such
matters covered by such report.


                                      105
<PAGE>

   The estimates as of December 31, 1998 of our interests in the proved
reserves attributable to the Powder River coal bed methane included in this
prospectus are based upon an audit dated October 27, 1998 by Fairchild, Ancell
& Wells, Inc., independent petroleum consultants, of an internally prepared
reserve report dated October 1, 1998, updated February 12, 1999, and are
included herein upon the authority of such firm as experts with respect to such
matters covered by such report.

                            INDEPENDENT ACCOUNTANTS

   The consolidated financial statements of Western as of December 31, 1998 and
1997 and for each of the three years in the period ended December 31, 1998,
included in this prospectus, have been audited by PricewaterhouseCoopers LLP,
independent accountants, as stated in their report incorporated by reference
herein.

                                      106
<PAGE>

                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

   Western Gas Resources, Inc.'s Consolidated Financial Statements as of June
30, 1999 (unaudited), December 31, 1998 and 1997 and for each of the six months
ended June 30, 1999 and 1998 (unaudited) and for each of the three years in the
period ended December 31, 1998:

<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
Report of Management....................................................... F-2

Report of Independent Accountants.......................................... F-3

Consolidated Balance Sheet................................................. F-4

Consolidated Statement of Cash Flows....................................... F-5

Consolidated Statement of Operations....................................... F-6

Consolidated Statement of Changes in Stockholders' Equity.................. F-7

Notes to Consolidated Financial Statements................................. F-9
</TABLE>

                                      F-1
<PAGE>

                              REPORT OF MANAGEMENT

   The financial statements and other financial information included in this
prospectus are the responsibility of Management. The financial statements have
been prepared in conformity with generally accepted accounting principles
appropriate in the circumstances and include amounts that are based on
Management's informed judgments and estimates.

   Management relies on the Company's system of internal accounting controls to
provide reasonable assurance that assets are safeguarded and that transactions
are properly recorded and executed in accordance with Management's
authorization. The concept of reasonable assurance is based on the recognition
that there are inherent limitations in all systems of internal accounting
control and that the cost of such systems should not exceed the benefits to be
derived. The internal accounting controls, including internal audit, in place
during the periods presented are considered adequate to provide such assurance.

   The Company's financial statements as of and for each of the three years
ended December 31, 1998 are audited by PricewaterhouseCoopers LLP, independent
accountants. Their report states that they have conducted their audit in
accordance with generally accepted auditing standards. These standards include
an evaluation of the system of internal accounting controls for the purpose of
establishing the scope of audit testing necessary to allow them to render an
independent professional opinion on the fairness of the Company's financial
statements.

   Oversight of Management's financial reporting and internal accounting
control responsibilities is exercised by the Board of Directors, through an
Audit Committee that consists solely of outside directors. The Audit Committee
meets periodically with financial management, internal auditors and the
independent accountants to review how each is carrying out its responsibilities
and to discuss matters concerning auditing, internal accounting control and
financial reporting. The independent accountants and the Company's internal
audit department have free access to meet with the Audit Committee without
Management present.

<TABLE>
<CAPTION>
       Signature                               Title
       ---------                               -----

<S>                       <C>
   /s/ L. F. Outlaw       President and Chief Operating Officer
 _______________________
      L. F. Outlaw

/s/ William J. Krysiak    Vice President--Finance (Principal Financial and
 _______________________   Accounting Officer)
   William J. Krysiak
</TABLE>

                                      F-2
<PAGE>

                       REPORT OF INDEPENDENT ACCOUNTANTS

To the Board of Directors and
Stockholders of Western Gas Resources, Inc.

   In our opinion, the accompanying consolidated balance sheet and the related
consolidated statements of cash flows, of operations, and of changes in
stockholders' equity present fairly, in all material respects, the financial
position of Western Gas Resources, Inc. and its subsidiaries at December 31,
1998 and 1997, and the results of their cash flows and their operations for
each of the three years in the period ended December 31, 1998, in conformity
with generally accepted accounting principles. These financial statements are
the responsibility of the Company's management; our responsibility is to
express an opinion on these financial statements based on our audits. We
conducted our audits of these statements in accordance with generally accepted
auditing standards which require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of
material misstatement. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements, assessing
the accounting principles used and significant estimates made by management,
and evaluating the overall financial statement presentation. We believe that
our audits provide a reasonable basis for the opinion expressed above.

PRICEWATERHOUSECOOPERS LLP

Denver, Colorado
March 22, 1999

                                      F-3
<PAGE>

                          WESTERN GAS RESOURCES, INC.

                           CONSOLIDATED BALANCE SHEET

                           (000s, except share data)

<TABLE>
<CAPTION>
                                             Six Months
                                             Ended June        Year Ended
                                                 30,          December 31,
                                             -----------  ----------------------
                                                1999         1998        1997
                                             -----------  ----------  ----------
                                             (unaudited)
                   ASSETS
<S>                                          <C>          <C>         <C>
Current assets:
 Cash and cash equivalents.................  $   11,298   $    4,400  $   19,777
 Trade accounts receivable, net............     195,273      233,574     258,791
 Product inventory.........................      17,379       46,207      17,261
 Parts inventory...........................       9,917       10,153       9,405
 Other.....................................          58        2,951       2,364
                                             ----------   ----------  ----------
 Total current assets......................     233,925      297,285     307,598
                                             ----------   ----------  ----------
Property and equipment:
 Gas gathering, processing, storage and
  transmission.............................     768,832      952,531   1,050,676
 Oil and gas properties and equipment......     128,998      111,602     136,129
 Construction in progress..................      77,945       87,943      64,268
                                             ----------   ----------  ----------
                                                975,775    1,152,076   1,251,073
Less: Accumulated depreciation, depletion
 and amortization..........................    (285,534)    (305,589)   (294,350)
                                             ----------   ----------  ----------
 Total property and equipment, net.........     690,241      846,487     956,723
                                             ----------   ----------  ----------
Other assets:
 Gas purchase contracts (net of accumulated
  amortization of $30,531, $29,978 and
  $27,554, respectively)...................      37,898       41,263      43,687
 Other.....................................      42,527       34,342      40,268
                                             ----------   ----------  ----------
 Total other assets........................      80,425       75,605      83,955
                                             ----------   ----------  ----------
Total assets...............................  $1,004,591   $1,219,377  $1,348,276
                                             ==========   ==========  ==========

<CAPTION>
    LIABILITIES AND STOCKHOLDERS' EQUITY
<S>                                          <C>          <C>         <C>
Current liabilities:
 Accounts payable..........................  $  210,715   $  245,315  $  326,696
 Accrued expenses..........................      22,226       31,727      27,151
 Dividends payable.........................       4,217        4,217       4,217
                                             ----------   ----------  ----------
 Total current liabilities.................     237,158      281,259     358,064
Long-term debt.............................     216,833      504,881     441,357
Senior subordinated debt...................     155,000          --          --
Deferred income taxes payable, net.........      37,393       48,021      80,743
                                             ----------   ----------  ----------
 Total liabilities.........................     646,384      834,161     880,164
                                             ----------   ----------  ----------
Commitments and contingent liabilities.....         --           --          --
Stockholders' equity:
 Preferred Stock; 10,000,000 shares
  authorized:
 $2.28 cumulative preferred stock, par
  value $.10; 1,400,000 shares issued
  ($35,000,000 aggregate liquidation
  preference)..............................         140          140         140
 $2.625 cumulative convertible preferred
  stock, par value $.10; 2,760,000 shares
  issued ($138,000,000 aggregate
  liquidation preference)..................         276          276         276
 Common stock, par value $.10; 100,000,000
  shares authorized; 32,173,009, 32,173,009
  and 32,171,453 shares issued,
  respectively.............................       3,217        3,217       3,217
 Treasury stock, at cost; 25,016 shares in
  treasury.................................        (788)        (788)       (788)
 Additional paid-in capital................     397,344      397,344     397,321
 Retained (deficit) earnings...............     (42,447)     (17,075)     66,999
 Accumulated other comprehensive income....       1,349        3,053       2,233
 Notes receivable from key employees
  secured by common stock..................        (884)        (951)     (1,286)
                                             ----------   ----------  ----------
 Total stockholders' equity................     358,207      385,216     468,112
                                             ----------   ----------  ----------
Total liabilities and stockholders'
 equity....................................  $1,004,591   $1,219,377  $1,348,276
                                             ==========   ==========  ==========
</TABLE>

   The accompanying notes are an integral part of the consolidated financial
                                  statements.

                                      F-4
<PAGE>

                          WESTERN GAS RESOURCES, INC.

                      CONSOLIDATED STATEMENT OF CASH FLOWS

                                     (000s)

<TABLE>
<CAPTION>
                            Six Months Ended
                                June 30,              Year Ended December 31,
                          ----------------------  ----------------------------------
                             1999        1998        1998        1997        1996
                          ----------  ----------  ----------  ----------  ----------
                               (unaudited)
<S>                       <C>         <C>         <C>         <C>         <C>
Reconciliation of net
 income (loss) to net
 cash
 provided by (used in)
 operating activities:
Net income (loss).......  $  (16,940) $   10,540  $  (67,205) $    1,487  $   27,941
Add income items that do
 not affect cash:
 Depreciation, depletion
  and amortization......      24,755      29,328      59,346      59,248      63,207
 Deferred income taxes..     (10,344)      9,680     (32,722)        465      12,538
 Distributions in excess
  of equity income, net.         --          --          963       1,764       4,339
 (Gain) loss on the sale
  of property and
  equipment.............      21,717     (14,813)    (16,478)     (4,681)     (2,747)
 Loss on the impairment
  of property and
  equipment.............         --          --      108,447      34,615         --
 Other non-cash items,
  net...................      (1,371)        778       2,595       3,250         336
                          ----------  ----------  ----------  ----------  ----------
                              17,817      35,513      54,946      96,148     105,614
                          ----------  ----------  ----------  ----------  ----------
Adjustments to working
 capital to arrive at
 net cash provided by
 (used in) operating
 activities:
 (Increase) decrease in
  trade accounts
  receivable............      38,301      50,907      25,317      79,963    (134,538)
 (Increase) decrease in
  product inventory.....      28,828     (36,457)    (29,810)      7,480       2,115
 (Increase) decrease in
  parts inventory.......         236        (267)       (748)     (6,806)       (172)
 (Increase) decrease in
  other current assets..       2,893        (579)       (587)     (1,027)        (42)
 (Increase) decrease in
  other assets and
  liabilities, net......       1,000         558         257         257        (733)
 (Decrease) increase in
  accounts payable......     (35,595)    (94,310)    (81,381)    (59,572)    186,758
 (Decrease) increase in
  accrued expenses......      (9,732)     (6,950)     (3,564)     (1,688)      9,264
                          ----------  ----------  ----------  ----------  ----------
 Total adjustments......      25,931     (87,098)    (90,516)     18,607      62,652
                          ----------  ----------  ----------  ----------  ----------
Net cash provided by
 (used in) operating
 activities.............      43,748     (51,585)    (35,570)    114,755     168,266
                          ----------  ----------  ----------  ----------  ----------
Cash flows from
 investing activities:
 Purchases of property
  and equipment,
  including
  acquisitions..........     (34,247)    (51,838)   (104,171)   (196,293)    (74,203)
 Proceeds from the
  disposition of
  property and
  equipment.............     148,100      22,250      75,286      20,034       7,656
 Contributions to
  unconsolidated
  affiliates............        (100)       (729)     (1,045)     (2,608)       (352)
 Distribution from
  unconsolidated
  affiliates............         --          --        3,489         --        1,500
                          ----------  ----------  ----------  ----------  ----------
Net cash used in
 investing activities...     113,753     (30,317)    (26,441)   (178,867)    (65,399)
                          ----------  ----------  ----------  ----------  ----------
Cash flows from
 financing activities:
 Net proceeds from
  issuance of common
  stock.................         --          --          --          --       96,376
 Net proceeds from
  exercise of common
  stock options.........         --           23          23         239          62
 Proceeds from issuance
  of long-term debt.....     155,000         --          --          --          --
 Payments on long-term
  debt..................     (84,047)     (7,143)    (15,476)    (94,643)    (12,500)
 Borrowings under
  revolving credit
  facility..............   1,611,300   1,443,200   3,230,400   1,894,950   1,035,377
 Payments on revolving
  credit facility.......  (1,815,300) (1,355,500) (3,151,400) (1,738,450) (1,172,877)
 Debt issue costs paid..      (9,124)         (2)        (44)       (847)        --
 Dividends paid.........      (8,432)     (8,435)    (16,869)    (16,864)    (15,596)
                          ----------  ----------  ----------  ----------  ----------
Net cash provided by
 (used in) financing
 activities.............    (150,603)     72,143      46,634      44,385     (69,158)
                          ----------  ----------  ----------  ----------  ----------
Net (decrease) increase
 in cash................       6,898      (9,759)    (15,377)    (19,727)     33,709
Cash and cash
 equivalents at
 beginning of year......       4,400      19,777      19,777      39,504       5,795
                          ----------  ----------  ----------  ----------  ----------
Cash and cash
 equivalents at end of
 year...................  $   11,298  $   10,018  $    4,400  $   19,777  $   39,504
                          ==========  ==========  ==========  ==========  ==========
</TABLE>

   The accompanying notes are an integral part of the consolidated financial
                                  statements.

                                      F-5
<PAGE>

                          WESTERN GAS RESOURCES, INC.

                      CONSOLIDATED STATEMENT OF OPERATIONS

                   (000s, except share and per share amounts)

<TABLE>
<CAPTION>
                              Six Months Ended
                                  June 30,                 Year Ended December 31,
                          -------------------------  -------------------------------------
                             1999          1998         1998         1997         1996
                          -----------  ------------  -----------  -----------  -----------
                                (unaudited)
<S>                       <C>          <C>           <C>          <C>          <C>
Revenues:
 Sale of gas............  $   715,055  $    804,972  $ 1,611,521  $ 1,657,479  $ 1,440,882
 Sale of natural gas
  liquids...............      139,854       232,624      449,696      611,969      561,581
 Processing,
  transportation and
  storage revenue.......       24,319        21,991       44,743       40,906       44,943
 Sale of electric
  power.................          --            --            20       59,477       30,667
 Other, net.............      (15,283)       21,639       27,586       15,429       12,936
                          -----------  ------------  -----------  -----------  -----------
 Total revenues.........      863,945     1,081,226    2,133,566    2,385,260    2,091,009
                          -----------  ------------  -----------  -----------  -----------
Costs and expenses:
 Product purchases......      795,178       962,282    1,914,303    2,146,430    1,844,151
 Plant operating
  expense...............       33,519        38,847       85,353       78,113       73,116
 Oil and gas exploration
  and production costs..        3,683         2,995        7,996        7,714        5,056
 Depreciation, depletion
  and amortization......       24,755        29,328       59,346       59,248       63,207
 Selling and
  administrative
  expense...............       15,952        14,907       30,128       29,446       29,411
 Interest expense.......       15,753        16,296       33,616       27,474       34,437
 Loss on the impairment
  of property and
  equipment.............          --            --       108,447       34,615          --
                          -----------  ------------  -----------  -----------  -----------
 Total costs and
  expenses..............      888,840     1,064,655    2,239,189    2,383,040    2,049,378
                          -----------  ------------  -----------  -----------  -----------
Income (loss) before
 income taxes...........      (24,895)       16,571     (105,623)       2,220       41,631
Provision (benefit) for
 income taxes:
 Current................        1,282        (3,649)      (5,696)         268        1,152
 Deferred...............      (10,344)        9,680      (32,722)         465       12,538
                          -----------  ------------  -----------  -----------  -----------
 Total provision
  (benefit) for income
  taxes.................       (9,062)        6,031      (38,418)         733       13,690
                          -----------  ------------  -----------  -----------  -----------
Income (loss) before
 extraordinary items....      (15,833)       10,540      (67,205)       1,487       27,941
Extraordinary charge for
 early extinguishment of
 debt, net of tax
 benefit................       (1,107)          --           --           --           --
                          -----------  ------------  -----------  -----------  -----------
Net income (loss).......      (16,940)       10,540      (67,205)       1,487       27,941
Preferred stock
 requirements...........       (5,220)       (5,220)     (10,439)     (10,439)     (10,439)
                          -----------  ------------  -----------  -----------  -----------
Income (loss)
 attributable to common
 stock..................  $   (22,160) $      5,320  $   (77,644) $    (8,952) $    17,502
                          ===========  ============  ===========  ===========  ===========
Earnings (loss) per
 share of common stock..  $      (.69) $        .17  $     (2.42) $      (.28) $       .66
                          ===========  ============  ===========  ===========  ===========
Weighted average shares
 of common stock
 outstanding............   32,147,993    37,147,035   32,147,354   32,134,011   26,519,635
                          ===========  ============  ===========  ===========  ===========
Earnings (loss) per
 share of common stock--
 assuming dilution......  $      (.69) $        .17  $     (2.42) $      (.28) $       .66
                          ===========  ============  ===========  ===========  ===========
Weighted average shares
 of common stock
 outstanding--assuming
 dilution...............   32,147,993    32,149,885   32,147,354   32,137,803   26,541,565
                          ===========  ============  ===========  ===========  ===========
</TABLE>

   The accompanying notes are an integral part of the consolidated financial
                                  statements.

                                      F-6
<PAGE>

                          WESTERN GAS RESOURCES, INC.

           CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY

             (unaudited as to the six months ended June 30, 1999)

                 (Dollars in thousands, except share amounts)

<TABLE>
<CAPTION>
                              Shares of
                  Shares of    $2.625                                      $2.625
                    $2.28    Cumulative             Shares of   $2.28    Cumulative                   Addi-
                  Cumulative Convertible Shares of   Common   Cumulative Convertible                  tional  Retained
                  Preferred   Preferred    Common   Stock in  Preferred   Preferred  Common Treasury Paid-In  (Deficit)
                    Stock       Stock      Stock    Treasury    Stock       Stock    Stock   Stock   Capital  Earnings
                  ---------- ----------- ---------- --------- ---------- ----------- ------ -------- -------- ---------
<S>               <C>        <C>         <C>        <C>       <C>        <C>         <C>    <C>      <C>      <C>
Balance at
December 31,
1995............  1,400,000   2,760,000  25,769,712  25,016      $140       $276     $2,580  $(788)  $301,234 $ 70,348
Comprehensive
Income:
Net income,
1996............        --          --          --      --        --         --         --     --         --    27,941
Comprehensive
Income..........
Dividends:
Dividends
declared on
common stock            --          --          --      --        --         --         --     --         --    (5,472)
Dividends
declared on
$2.28 cumulative
preferred stock.        --          --          --      --        --         --         --     --         --    (3,194)
Dividends
declared on
$2.625
cumulative
convertible
preferred stock.        --          --          --      --        --         --         --     --         --    (7,245)
Stock options
exercised.......        --          --       14,423     --        --         --           1    --          83      --
Loans forgiven..        --          --          --      --        --         --         --     --         --       --
Common stock
offering........        --          --    6,325,000     --        --         --         632    --      95,744      --
                  ---------   ---------  ----------  ------      ----       ----     ------  -----   -------- --------
Balance at
December 31,
1996............  1,400,000   2,760,000  32,109,135  25,016       140        276      3,213   (788)   397,061   82,378
Comprehensive
Income:
Net income,
1997............        --          --          --      --        --         --         --     --         --     1,487
Tax benefit
related to stock
options.........        --          --          --      --        --         --         --     --         --       --
Comprehensive
Income..........
Dividends:
Dividends
declared on
common stock....        --          --          --      --        --         --         --     --         --    (6,427)
Dividends
declared on
$2.28 cumulative
preferred stock.        --          --          --      --        --         --         --     --         --    (3,194)
Dividends
declared on
$2.625
cumulative
convertible
preferred stock.        --          --          --      --        --         --         --     --         --    (7,245)
Stock options
exercised.......        --          --       37,302     --        --         --           4    --         260      --
Loans forgiven..        --          --          --      --        --         --         --     --         --       --
                  ---------   ---------  ----------  ------      ----       ----     ------  -----   -------- --------
Balance at
December 31,
1997............  1,400,000   2,760,000  32,146,437  25,016       140        276      3,217   (788)   397,321   66,999
<CAPTION>
                  Cumulative
                   Accumu-
                    lated
                    Other      Notes     Total
                   Compre-   Receivable  Stock-
                   hensive    from Key  holders'
                    Income   Employees   Equity
                  ---------- ---------- ---------
<S>               <C>        <C>        <C>
Balance at
December 31,
1995............   $   --     $(1,881)  $371,909
Comprehensive
Income:
Net income,
1996............       --         --      27,941
                                        ---------
Comprehensive
Income..........                          27,941
                                        ---------
Dividends:
Dividends
declared on
common stock           --         --      (5,472)
Dividends
declared on
$2.28 cumulative
preferred stock.       --         --      (3,194)
Dividends
declared on
$2.625
cumulative
convertible
preferred stock.       --         --      (7,245)
Stock options
exercised.......       --         (24)        60
Loans forgiven..       --          92         92
Common stock
offering........       --         --      96,376
                  ---------- ---------- ---------
Balance at
December 31,
1996............       --      (1,813)   480,467
Comprehensive
Income:
Net income,
1997............       --         --       1,487
Tax benefit
related to stock
options.........     2,233        --       2,233
                                        ---------
Comprehensive
Income..........                           3,720
                                        ---------
Dividends:
Dividends
declared on
common stock....       --         --      (6,427)
Dividends
declared on
$2.28 cumulative
preferred stock.       --         --      (3,194)
Dividends
declared on
$2.625
cumulative
convertible
preferred stock.       --         --      (7,245)
Stock options
exercised.......       --         (25)       239
Loans forgiven..       --         552        552
                  ---------- ---------- ---------
Balance at
December 31,
1997............     2,233     (1,286)   468,112
</TABLE>

                                      F-7
<PAGE>

                          WESTERN GAS RESOURCES, INC.

           CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY

             (unaudited as to the six months ended June 30, 1999)

                 (Dollars in thousands, except share amounts)

<TABLE>
<CAPTION>
                              Shares of
                  Shares of    $2.625                                      $2.625
                    $2.28    Cumulative             Shares of   $2.28    Cumulative                   Addi-
                  Cumulative Convertible Shares of   Common   Cumulative Convertible                  tional  Retained
                  Preferred   Preferred    Common   Stock in  Preferred   Preferred  Common Treasury Paid-In  (Deficit)
                    Stock       Stock      Stock    Treasury    Stock       Stock    Stock   Stock   Capital  Earnings
                  ---------- ----------- ---------- --------- ---------- ----------- ------ -------- -------- ---------
<S>               <C>        <C>         <C>        <C>       <C>        <C>         <C>    <C>      <C>      <C>
Comprehensive
Income:
Net income
1998............        --          --          --      --       $--        $--      $  --   $ --    $    --  $(67,205)
Translation
adjustments.....        --          --          --      --        --         --         --     --         --       --
Comprehensive
Income..........
Dividends:
Dividends
declared on
common stock....        --          --          --      --        --         --         --     --         --    (6,430)
Dividends
declared on
$2.28 cumulative
preferred stock.        --          --          --      --        --         --         --     --         --    (3,194)
Dividends
declared on
$2.625
cumulative
convertible
preferred stock.        --          --          --      --        --         --         --     --         --    (7,245)
Stock options
exercised.......        --          --        1,556     --        --         --         --     --          23      --
Loans forgiven..        --          --          --      --        --         --         --     --         --       --
                  ---------   ---------  ----------  ------      ----       ----     ------  -----   -------- --------
Balance at
December 31,
1998............  1,400,000   2,760,000  32,147,993  25,016       140        276      3,217   (788)   397,344  (17,075)
Comprehensive
Income:
Net income
1999............        --          --          --      --        --         --         --     --         --   (16,940)
Translation
adjustments.....        --          --          --      --        --         --         --     --         --       --
Comprehensive
Income..........
Dividends:
Dividends
declared on
common stock....        --          --          --      --        --         --         --     --         --    (3,214)
Dividends
declared on
$2.28 cumulative
preferred stock.        --          --          --      --        --         --         --     --         --    (1,596)
Dividends
declared on
$2.625
cumulative
convertible
preferred stock.        --          --          --      --        --         --         --     --         --    (3,622)
Loans forgiven..        --          --          --      --        --         --         --     --         --       --
                  ---------   ---------  ----------  ------      ----       ----     ------  -----   -------- --------
Balance at June
30, 1999........  1,400,000   2,760,000  32,147,993  25,016      $140       $276     $3,217  $(788)  $397,344 $(42,447)
                  =========   =========  ==========  ======      ====       ====     ======  =====   ======== ========
<CAPTION>
                  Cumulative
                   Accumu-
                    lated
                    Other      Notes     Total
                   Compre-   Receivable  Stock-
                   hensive    from Key  holders'
                    Income   Employees   Equity
                  ---------- ---------- ---------
<S>               <C>        <C>        <C>
Comprehensive
Income:
Net income
1998............   $   --     $   --    $(67,205)
Translation
adjustments.....       820        --         820
                                        ---------
Comprehensive
Income..........                         (68,025)
Dividends:
Dividends
declared on
common stock....       --         --      (6,430)
Dividends
declared on
$2.28 cumulative
preferred stock.       --         --      (3,194)
Dividends
declared on
$2.625
cumulative
convertible
preferred stock.       --         --      (7,245)
Stock options
exercised.......       --         --          23
Loans forgiven..       --         335        335
                  ---------- ---------- ---------
Balance at
December 31,
1998............     3,053       (951)   385,216
Comprehensive
Income:
Net income
1999............       --         --     (16,940)
Translation
adjustments.....    (1,704)       --      (1,704)
Comprehensive
Income..........                         (18,644)
Dividends:
Dividends
declared on
common stock....       --         --      (3,214)
Dividends
declared on
$2.28 cumulative
preferred stock.       --         --      (1,596)
Dividends
declared on
$2.625
cumulative
convertible
preferred stock.       --         --      (3,622)
Loans forgiven..       --          67         67
                  ---------- ---------- ---------
Balance at June
30, 1999........   $ 1,349    $  (884)  $358,207
                  ========== ========== =========
</TABLE>

   The accompanying notes are an integral part of the consolidated financial
                                  statements.

                                      F-8
<PAGE>

                          WESTERN GAS RESOURCES, INC.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

NOTE 1--NATURE OF ORGANIZATION

   Western Gas Resources, Inc. (the "Company") is an independent gas gatherer
and processor and energy marketer providing a full range of services to its
customers from the wellhead to the delivery point. The Company designs,
constructs, owns and operates natural gas gathering, processing, treating and
storage facilities in major gas-producing basins in the Rocky Mountain, Mid-
Continent, Gulf Coast and Southwestern regions of the United States. The
Company connects producers' wells to its gathering systems for delivery to its
processing or treating plants, processes the natural gas to extract natural gas
liquids ("NGLs") and treats the natural gas in order to meet pipeline
specifications. The Company markets gas and NGLs nationwide and in Canada,
providing risk management, storage, transportation, scheduling, peaking and
other services to a variety of customers. The Company owns and operates certain
producing properties, primarily in Wyoming and Louisiana. The Company also
explores and develops gas reserves, primarily in Wyoming, in support of its
existing facilities.

   Western Gas Resources, Inc. was formed in October 1989 to acquire a majority
interest in Western Gas Processors, Ltd. (the "Partnership") and to assume the
duties of WGP Company, the general partner of the Partnership. The Partnership
was a Colorado limited partnership formed in 1977 to engage in the gathering
and processing of natural gas. The reorganization was accomplished in December
1989 through an exchange for common stock of partnership units held by the
former general partners of WGP Company and an initial public offering of
Western Gas Resources, Inc. Common Stock. On May 1, 1991, a further
restructuring ("Restructuring") of the Partnership and Western Gas Resources,
Inc. (together with its predecessor, WGP Company, collectively, the "Company")
was approved by a vote of the security holders. The combinations were
reorganizations of entities under common control and were accounted for at
historical cost in a manner similar to poolings of interests.

   The Company has completed three public offerings of Common Stock. In
December 1989, the Company issued 3,527,500 shares of Common Stock at a public
offering price of $11.50. In November 1991, the Company issued 4,115,000 shares
of Common Stock at a public offering price of $18.375 per share. In November
1996, the Company issued 6,325,000 shares of Common Stock at a public offering
price of $16.25 per share. The net proceeds to the Company from the November
1996 public offering of Common Stock of $96.4 million were primarily used to
reduce indebtedness under the Revolving Credit Facility.

   The Company has also issued preferred stock in a private transaction and has
completed two public offerings of preferred stock. In October 1991, the Company
issued 400,000 shares of 7.25% Cumulative Senior Perpetual Convertible
Preferred Stock ("7.25% Preferred Stock") with a liquidation preference of $100
per share to an institutional investor. In May 1995, the Company redeemed all
of the issued and outstanding shares of its 7.25% Preferred Stock pursuant to
the provisions of its Certificate of Designation relating to such preferred
stock, at an aggregate redemption price of approximately $42.0 million,
including a redemption premium of $2.0 million. In November 1992, the Company
issued 1,400,000 shares of $2.28 Cumulative Preferred Stock with a liquidation
preference of $25 per share, at a public offering price of $25 per share,
redeemable at the Company's option on or after November 15, 1997. In February
1994, the Company issued 2,760,000 shares of $2.625 Cumulative Convertible
Preferred Stock with a liquidation preference of $50 per share, at a public
offering price of $50 per share, redeemable at the Company's option on or after
February 16, 1997 and convertible at the option of the holder into Common Stock
at a conversion price of $39.75.

Significant Business Acquisitions, Dispositions and Projects

 Powder River Basin

   The Company continues to develop its Powder River Basin coal bed methane
natural gas gathering system and developing its own coal seam gas reserves in
Wyoming. The Company has acquired drilling rights in the

                                      F-9
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

vicinity of known coal bed methane production. During the years ended December
31, 1998, 1997 and 1996, the Company has expended approximately $46.7 million,
$32.2 million and $6.9 million, respectively, on this project. On October 30,
1997, the Company sold a 50% undivided interest in its Powder River Basin coal
bed methane gas operations. The final adjusted purchase price was $17.9
million, resulting in a pre-tax gain of $4.7 million, which was recognized in
the fourth quarter of 1997.

   In December 1998, the Company joined with other industry participants to
form the Fort Union Gas Gathering, L.L.C., which is currently constructing a
106-mile, 24-inch gathering pipeline and treater to gather and treat natural
gas produced in the Powder River Basin in northeast Wyoming. The Company has an
approximate 13% equity interest in Fort Union and is the construction manager
and field operator of the system. The Company commenced operations in September
1999. The new gathering pipeline and treating system was project-financed, and
will require a cash investment by the Company of approximately $2 million.

 Southwest Wyoming

   The Company's facilities in Southwest Wyoming are comprised of the Granger
facility and a 72% ownership interest in the Lincoln Road facility
(collectively the "Granger Complex"). The Company began to expand its gas
gathering and exploration and production activities in Southwest Wyoming during
1997. The expansion in this area is primarily intended to develop acreage to
replace declines in reserves and generate additional volumes for gathering and
processing at its facilities. During the years ended December 31, 1998 and
1997, the Company has expended approximately $16.0 million and $6.2 million,
respectively, on this project. In February 1998, the Company sold a 50%
undivided interest in a small portion of the Granger gathering system for
approximately $4.0 million. This amount approximated the Company's cost in such
facilities.

   In 1997, the Company granted an option to an affiliate of a producer behind
the Granger Complex to purchase up to 50% of the Granger Complex. In
conjunction with this agreement, in February 1998, the Company received a $1.0
million non-refundable option payment. The option to acquire an interest in
these facilities expired in the fourth quarter of 1998.

 Bethel Treating Facility

   In 1996 and 1997 the Pinnacle Reef trend was rapidly developing into a very
active lease acquisition and exploratory play using 3-D seismic technology. The
initial discoveries in the play indicated a very large potential gas
development. Based on the Company's receipt of large acreage dedications in
this area, the Company constructed the Bethel Treating facility for a total
cost of approximately $102.8 million with a throughput capacity of 350 MMcf per
day. In 1998, the production rates from the wells drilled in this field and the
recoverable reserves from these properties, were far less than originally
expected by the producers. As a result, in 1998, the Bethel Treating facility
averaged gas throughput of approximately 61 MMcf per day. Due to the unexpected
poor drilling results and reductions in the producers' drilling budgets, the
number of rigs active in this area has decreased from 18 in July 1998 to one
active rig in June 1999.

   In 1998, the Company completed the construction of the Bethel Treating
facility in East Texas that gathers gas from the Cotton Valley Pinnacle Reef
trend, for a total cost of approximately $102.8 million. Because of
uncertainties related to the pace and success of third-party drilling programs,
declines in volumes produced at certain wells and other conditions outside of
the Company's control, the Company determined that a pre-tax, non-cash
impairment charge of $77.8 million in the fourth quarter of 1998 was required.

                                      F-10
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


 Edgewood

   In two transactions which closed in October 1998 the Company sold its
Edgewood gathering system, including its undivided interest in the producing
properties associated with this facility, and its 50% interest in the Redman
Smackover Joint Venture ("Redman Smackover"). The combined sales price was
$55.8 million. The proceeds from these sales were used to repay a portion of
the balances outstanding under the Revolving Credit Facility. After the accrual
of certain related expenses, the Company recognized a pre-tax gain of
approximately $1.6 million during the fourth quarter of 1998.

 Perkins

   In November 1997, the Company entered into an agreement to sell its Perkins
facility. In March 1998, the Company completed the sale of this facility with
an effective date of January 1, 1998. The sales price was $22.0 million and
resulted in a pre-tax gain of approximately $14.9 million. The proceeds from
this sale were used to repay a portion of the balances outstanding under the
Revolving Credit Facility.

 Subsequent Events (unaudited)

   Giddings. In April 1999, the Company sold our Giddings gathering system in
Texas to GPM Gas Corporation, a business unit of Phillips Petroleum Company.
This transaction had an effective date of January 1, 1999. The proceeds from
this sale were $36.0 million. This sale resulted in an approximate pre-tax loss
of $6.6 million in the second quarter of 1999, subject to final accounting
adjustment.

   Katy. Effective April 30, 1999, the Company sold all the stock of its
wholly-owned subsidiary, Western Gas Resources Storage, Inc., to the Aquila
Energy Corporation, a business unit of Utilicorp United, for gross proceeds of
$100.0 million. The sole asset of this subsidiary was the Katy Hub and Gas
Storage Facility. This transaction resulted in an approximate pre-tax loss of
$16.6 million, in the second quarter of 1999, subject to final accounting
adjustments. In April 1999, the company also sold 5.1 Bcf of stored gas in the
Katy facility to the same purchaser for total sales proceeds of $11.7 million,
which approximated the cost of the inventory. To meet the needs of the
Company's marketing operations, it will continue to contract for storage
capacity. Accordingly, the Company has entered into a long-term agreement with
the purchaser for approximately 3 Bcf of storage capacity at market rates.

   MiVida. In June 1999, the Company sold our MiVida treating facility for
gross proceeds of $12.0 million. This transaction resulted in an approximate
pre-tax gain of $1.2 million in the second quarter of 1999, subject to final
accounting adjustments.

   The proceeds from all of these sales were used to reduce borrowings
outstanding under the Revolving Credit Facility.

   Sale of senior subordinated debt. In June 1999, the Company sold $155.0
million of Senior Subordinated Notes in a private placement. These notes bear
interest at 10% and were priced at 99.225% to yield 10.125%. The Company
received net proceeds of approximately $150.0 million from the offering of
these notes, after deducting underwriters' discounts and estimated expenses of
the offering. The Company applied a portion of the net proceeds to repay
approximately $33.3 million of outstanding indebtedness under the Master Shelf
agreement, on which pre-tax make-whole payments of $1.1 million were also paid.
The remaining proceeds of approximately $115.6 million were used to repay a
portion of the outstanding indebtedness under the Revolving Credit Facility.

                                      F-11
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


   Extraordinary item--Early extinguishment of debt. In addition to the $1.1
million make-whole payment incurred in connection with the repayments under the
Master Shelf agreement, the Company incurred an additional $700,000 in fees and
expenses related to these prepayments as well as prepayments of a portion of
the 1995 Senior Notes and the prepayment of the 1993 Senior Notes. The total
costs incurred of approximately $1.8 million net of a tax benefit of $700,000,
are reflected as an extraordinary loss on early extinguishment of debt in the
second quarter of 1999. The net extraordinary loss of $1.1 million resulted in
an increase in loss per share of common stock--assuming dilution of $.03.

NOTE 2--SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

   The significant accounting policies followed by the Company and its wholly-
owned subsidiaries are presented here to assist the reader in evaluating the
financial information contained herein. The Company's accounting policies are
in accordance with generally accepted accounting principles. The interim
consolidated financial statements as of June 30, 1999 and for the six month
periods ended June 30, 1999 and 1998 included herein are unaudited but reflect,
in the opinion of management, all adjustments (which include only normal
recurring adjustments) necessary to fairly present the results for such
periods. The results of operations for the six months ended June 30, 1999 are
not necessarily indicative of the results of operations expected for the year
ended December 31, 1999.

 Principles of Consolidation

   The consolidated financial statements include the accounts of the Company
and the Company's wholly-owned subsidiaries. All material intercompany
transactions have been eliminated in consolidation. The Company's interest in
certain investments is accounted for by the equity method.

 Inventories

   Since January 1, 1997, the cost of gas and NGL inventories is determined by
the weighted average cost on a location-by-location basis. Prior to 1997, the
cost of NGL inventories was determined by the last-in, first-out (LIFO) method,
on a location-by-location basis. The change in accounting method from LIFO to
weighted average cost was not material. As a result, prior year financial
statements were not restated. Residue and NGL inventory covered by hedging
contracts is accounted for on a specific identification basis. Product
inventory includes $42.8 million and $11.9 million of gas and $3.4 million and
$5.4 million of NGLs at December 31, 1998 and 1997, respectively. During the
six months ended June 30, 1998 and the years ended December 31, 1998 and 1997,
the Company recorded lower of cost or market write-downs of NGL inventories of
$328,000, $826,000 and $1.1 million, respectively.

 Property and Equipment

   Property and equipment is recorded at the lower of cost, including interest
on funds borrowed to finance the construction of new projects, or estimated
realizable value. Interest incurred during the construction period of new
projects is capitalized and amortized over the life of the associated assets.

   Depreciation is provided using the straight-line method based on the
estimated useful life of each facility which ranges from three to 35 years.
Useful lives are determined based on the shorter of the life of the equipment
or the reserves serviced by the equipment. The cost of acquired gas purchase
contracts is amortized using the straight-line method.

                                      F-12
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


 Oil and Gas Properties and Equipment

   The Company follows the successful efforts method of accounting for oil and
gas exploration and production activities. Acquisition costs, development costs
and successful exploration costs are capitalized. Exploratory dry hole costs,
lease rentals and geological and geophysical costs are charged to expense as
incurred. Upon surrender of undeveloped properties, the original cost is
charged against income. Producing properties and related equipment are depleted
and depreciated by the units-of-production method based on estimated proved
reserves for producing properties and proved developed reserves for lease and
well equipment.

 Income Taxes

   Deferred income taxes reflect the impact of temporary differences between
amounts of assets and liabilities for financial reporting purposes and such
amounts as measured by tax laws. These temporary differences are determined and
accounted for in accordance with SFAS No. 109, "Accounting for Income Taxes."

 Foreign Currency Adjustments

   During the second quarter of 1997, the Company began operating a subsidiary
in Canada. The assets and liabilities associated with this subsidiary are
translated into U.S. dollars at the exchange rate as of the balance sheet date
and revenues and expenses at the weighted-average of exchange rates in effect
during each reporting period. SFAS No. 52, "Foreign Currency Translation,"
requires that cumulative translation adjustments be reported as a separate
component of stockholders' equity. The translation adjustment for the six
months ended June 30, 1999 and for the year ended December 31, 1998 was ($1.7
million) and $820,000, respectively. The adjustment for the year ended December
31, 1997 was not material.

 Revenue Recognition

   Revenue for sales or services is recognized at the time the gas, NGLs or
electric power is delivered or at the time the service is performed.

 Comprehensive Income

   In June 1997, the Financial Accounting Standards Board issued SFAS No. 130,
"Reporting Comprehensive Income," ("SFAS No. 130") effective for fiscal years
beginning after December 15, 1997. SFAS No. 130 requires that changes in items
of comprehensive income be reported as a separate component of stockholders'
equity. The Company's cumulative translation adjustments of $1.3 million and
$820,000, respectively, for the six months ended June 30, 1999 and the year
ended December 31, 1998, and tax benefits related to stock options of $2.2
million for the year ended December 31, 1997 are separately reported on the
Consolidated Statement of Changes in Stockholders' Equity.

 Gas and NGL Hedges

   Gains and losses on hedges of product inventory are included in the carrying
amount of the inventory and are ultimately recognized in gas and NGL sales when
the related inventory is sold. Gains and losses related to qualifying hedges,
as defined by SFAS No. 80, "Accounting for Futures Contracts," of firm
commitments or anticipated transactions (including hedges of equity production)
are recognized in gas and NGL sales, as reported on the Consolidated Statement
of Operations, when the hedged physical transaction occurs. For purposes of the
Consolidated Statement of Cash Flows, all hedging gains and losses are
classified in net cash

                                      F-13
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

provided by operating activities. To the extent the Company engages in
speculative transactions, they are marked to market at the end of each
accounting period and any gain or loss is recognized in income for that period.

 Impairment of Long-Lived Assets

   The Company complies with SFAS No. 121, "Accounting for the Impairment of
Long-Lived Assets and for Long-Lived Assets to be Disposed of" ("SFAS No.
121"). The Company reviews its assets at the plant facility and oil and gas
producing property levels. SFAS No. 121 also requires long-lived assets be
reviewed whenever events or changes in circumstances indicate that the carrying
value of such assets may not be recoverable. In order to determine whether an
impairment exists, the Company compares its net book value of the asset to the
estimated fair market value or the undiscounted expected future cash flows,
determined by applying future prices estimated by management over the shorter
of the lives of the facilities or the reserves supporting the facilities. If an
impairment exists, write-downs of assets are based upon expected cash flows
discounted using an interest rate commensurate with the risk associated with
the underlying asset. The Company has written-down property and equipment of
$108.5 million and $34.6 million in accordance with SFAS No. 121 during the
years ended December 31, 1998 and 1997, respectively.

 Earnings (Loss) Per Share of Common Stock

   The Company follows SFAS No. 128, "Earnings per Share" ("SFAS No. 128")
which requires that earnings per share and earnings per share--assuming
dilution be calculated and presented on the face of the statement of
operations. In accordance with SFAS No. 128, earnings (loss) per share of
common stock is computed by dividing income (loss) attributable to common stock
by the weighted average shares of common stock outstanding. In addition,
earnings (loss) per share of common stock--assuming dilution is computed by
dividing income (loss) attributable to common stock by the weighted average
shares of common stock outstanding as adjusted for potential common shares.
Income (loss) attributable to common stock is income (loss) less preferred
stock dividends. The Company declared preferred stock dividends of $5.2 million
for each of the six months ended June 30, 1999 and 1998, respectively and $10.4
million for each of the years ended December 31, 1998, 1997 and 1996,
respectively. Common stock options, which are potential common shares, had a
dilutive effect on earnings per share and increased the weighted average shares
of common stock outstanding by 2,850, 3,792 and 21,930 shares for the six
months ended June 30, 1998 and for the years ended December 31, 1997 and 1996,
respectively. The Common stock options were anti-dilutive in the six months
ended June 30, 1999 and for the year 1998, therefore the numerator and
denominator for each of these periods was not adjusted. SFAS No. 128 dictates
that the computation of earnings per share shall not assume conversion,
exercise or contingent issuance of securities that would have an anti-dilutive
effect on earnings (loss) per share. As a result, the numerators and the
denominators for each of the three years ended December 31, 1998 are not
adjusted to reflect the Company's $2.625 Cumulative Convertible Preferred Stock
outstanding. The shares are anti-dilutive as the incremental shares result in
an increase in earnings per share, or a reduction of loss per share, after
giving affect to the dividend requirements.

 Concentration of Credit Risk

   Financial instruments which potentially subject the Company to
concentrations of credit risk consist principally of trade accounts receivable
and over-the-counter ("OTC") swaps and options. The risk is limited due to the
large number of entities comprising the Company's customer base and their
dispersion across industries and geographic locations. At December 31, 1998,
the Company believes it had no significant concentrations of credit risk.

                                      F-14
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


 Cash and Cash Equivalents

   Cash and cash equivalents includes all cash balances and highly liquid
investments with an original maturity of three months or less.

 Supplementary Cash Flow Information

   Interest paid was $16.7 million, $20.5 million, $36.1 million, $33.1 million
and $36.7 million, respectively, for the six months ended June 30, 1999 and
1998 and for the years ended December 31, 1998, 1997 and 1996. Capitalized
interest associated with construction of new projects was $2.5 million, $5.1
million and $1.7 million, respectively, for the years ended December 31, 1998,
1997 and 1996.

   Income taxes paid were $0, $0, $0, $2.6 million and $4.2 million,
respectively, for the six months ended June 30, 1999 and 1998 and for the years
ended December 31, 1998, 1997 and 1996.

 Stock Compensation

   As permitted under SFAS No. 123, "Accounting for Stock-Based Compensation"
("SFAS No. 123"), the Company has elected to continue to measure compensation
costs for stock-based employee compensation plans as prescribed by Accounting
Principles Board Opinion No. 25, "Accounting for Stock Issued to Employees"
("APB No. 25"). The Company has complied with the pro forma disclosure
requirements of SFAS No. 123 as required under the pronouncement.

   The Company realizes an income tax benefit from the exercise of non-
qualified stock options related to the difference between the market price at
the date of exercise and the option price. APB No. 25 requires that this
difference be credited to additional paid-in capital. In September 1997, the
Company recorded a credit of $2.2 million to Additional Paid-In Capital to
reflect such difference associated with the Company's $5.40 Stock Option Plan.

 Use of Estimates and Significant Risks

   The preparation of consolidated financial statements in conformity with
generally accepted accounting principles requires management to make estimates
and assumptions that affect the amounts reported in these financial statements
and accompanying notes. The more significant areas requiring the use of
estimates relate to oil and gas reserves, fair value of financial instruments,
future cash flows associated with assets and useful lives for depreciation,
depletion and amortization. Actual results could differ from those estimates.

   The Company is subject to a number of risks inherent in the industry in
which it operates, primarily fluctuating prices and gas supply. The Company's
financial condition and results of operations will depend significantly upon
the prices received for gas and NGLs. These prices are subject to fluctuations
in response to changes in supply, market uncertainty and a variety of
additional factors that are beyond the control of the Company. In addition, the
Company must continually connect new wells to its gathering systems in order to
maintain or increase throughput levels to offset natural declines in dedicated
volumes. The number of new wells drilled will depend upon, among other factors,
prices for gas and oil, the drilling budgets of third-party producers, the
energy policy of the federal government and the availability of foreign oil and
gas, none of which are within the Company's control.

 Accounting for Derivative Instruments and Hedging Activities

   In June 1998, the Financial Accounting Standards Board issued SFAS No. 133,
"Accounting for Derivative Instruments and Hedging Activities" ("SFAS No.
133"), effective for fiscal years beginning after

                                      F-15
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

June 15, 2000. Under SFAS No. 133, the Company will be required to recognize
all derivatives as either assets or liabilities in the statement of financial
position and measure those instruments at fair value. Changes in the fair value
of derivatives are recorded each period in current earnings or other
comprehensive income depending upon the nature of the underlying transaction.
The Company has not yet determined the impact that the adoption of SFAS No. 133
will have on its earnings or financial position.

 Reclassifications

   Certain prior years' amounts in the consolidated financial statements and
related notes have been reclassified to conform to the presentation used in
1998.

NOTE 3--RELATED PARTIES

   The Company enters into joint ventures and partnerships in order to reduce
risk, create strategic alliances and to establish itself in oil and gas
producing basins in the United States. For the years ended December 31, 1998,
1997 and 1996, the Company had a 50% ownership interest in Williston Gas
Company ("Williston") and Westana Gathering Company ("Westana"). In addition,
for the years ended December 31, 1997 and 1996 the Company also had a 50%
ownership interest in Redman Smackover. This interest was sold effective July
1, 1998. The Company acts as operator for Williston and Westana. The Company
also has a 49% interest in the Sandia Energy Resources Joint Venture
("Sandia"), which was formed in March 1996. The Company's share of equity
income or loss in these ventures is reflected in Other net revenue. All
transactions entered into by the Company with its related parties are
consummated in the ordinary course of business.

   Historically, the Company had purchased a significant portion of the
production of Williston. The Company also performed various operational and
administrative functions for Williston and charged a monthly overhead fee to
cover such services. In August 1996, substantially all of the assets associated
with Williston were sold to a third party. The Company expects that Williston
will be dissolved during 1999. At December 31, 1998, the Company's investment
in Williston was immaterial.

   The Company performs various operational and administrative functions for
Westana and charges a monthly overhead fee to cover such services. The Company
records receivable and payable balances at the end of each accounting period
related to transactions with Westana. At December 31, 1998, the Company's
investment in Westana was $26.9 million.

   The Company provides substantially all of the natural gas that Sandia
markets and also provides various administrative services to Sandia. In
addition, the Company purchases gas from Sandia. The Company records receivable
and payable balances at the end of each accounting period related to the above
referenced transactions. At December 31, 1998, the Company's investment in
Sandia was $546,000. Sandia will be dissolved in the first quarter of 1999.

   The following table summarizes account balances reflected in the financial
statements (000s):

<TABLE>
<CAPTION>
                                      As of or for the
                                         Year Ended
                                        December 31,
                                    --------------------
                                     1998   1997   1996
                                    ------ ------ ------
            <S>                     <C>    <C>    <C>
            Trade accounts
             receivable...........  $3,794 $4,295 $5,552
                                    ====== ====== ======
            Accounts payable......   9,474  7,246 11,041
                                    ====== ====== ======
            Sales of gas and NGLs.  31,319 19,504 10,592
                                    ====== ====== ======
            Processing revenue....     192    336    256
                                    ====== ====== ======
            Product purchases.....  58,899 59,082 57,675
                                    ====== ====== ======
            Administrative
             expense..............  $  483 $  421 $  419
                                    ====== ====== ======
</TABLE>

                                      F-16
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


   The Company has entered into agreements committing the Company to loan to
certain key employees an amount sufficient to exercise their options as each
portion of their options vests under the Key Employees' Incentive Stock Option
Plan and the $5.40 Stock Option Plan (see note 10). The Company will forgive
the loan and accrued interest if the employee has been continuously employed by
the Company for periods specified under the agreements and Board of Directors'
resolutions. As of December 31, 1998 and 1997, loans totaling $951,000 and $1.3
million, respectively, were outstanding to certain employees under these
programs. The loans are secured by a portion of the Common Stock issued upon
exercise of the options and are accounted for as a reduction of stockholders'
equity. During 1998 and 1997, the Board of Directors approved the forgiveness
of loans to certain employees totaling approximately $335,000 and $552,000,
respectively, in connection with these plans.

NOTE 4--COMMODITY RISK MANAGEMENT

Gas and NGL Hedges

   The Company's commodity price risk management program has two primary
objectives. The first goal is to preserve and enhance the value of the
Company's equity volumes of gas and NGLs with regard to the impact of commodity
price movements on cash flow, net income and earnings per share in relation to
those anticipated by the Company's operating budget. The second goal is to
manage price risk related to the Company's physical gas, crude oil and NGL
marketing activities to protect profit margins. This risk relates to hedging
fixed price purchase and sale commitments, preserving the value of storage
inventories, reducing exposure to physical market price volatility and
providing risk management services to a variety of customers.

   The Company utilizes a combination of fixed price forward contracts,
exchange-traded futures and options, as well as fixed index swaps, basis swaps
and options traded in the over-the-counter ("OTC") market to accomplish these
objectives. These instruments allow the Company to preserve value and protect
margins because gains or losses in the physical market are offset by
corresponding losses or gains in the value of the financial instruments.

   The Company uses futures, swaps and options to reduce price risk and basis
risk. Basis is the difference in price between the physical commodity being
hedged and the price of the futures contract used for hedging. Basis risk is
the risk that an adverse change in the futures market will not be completely
offset by an equal and opposite change in the cash price of the commodity being
hedged. Basis risk exists in natural gas primarily due to the geographic price
differentials between cash market locations and futures contract delivery
locations.

   The Company enters into futures transactions on the New York Mercantile
Exchange ("NYMEX") and the Kansas City Board of Trade and through OTC swaps and
options with various counterparties, consisting primarily of financial
institutions and other natural gas companies. The Company conducts its standard
credit review of OTC counterparties and has agreements with such parties that
contain collateral requirements. The Company generally uses standardized swap
agreements that allow for offset of positive and negative exposures. OTC
exposure is marked to market daily for the credit review process. The Company's
OTC credit risk exposure is partially limited by its ability to require a
margin deposit from its major counterparties based upon the mark-to-market
value of their net exposure. The Company is subject to margin deposit
requirements under these same agreements. In addition, the Company is subject
to similar margin deposit requirements for its NYMEX counterparties related to
its net exposures.

   The use of financial instruments may expose the Company to the risk of
financial loss in certain circumstances, including instances when (i) equity
volumes are less than expected, (ii) the Company's customers fail to purchase
or deliver the contracted quantities of natural gas or NGLs, or (iii) the
Company's OTC counterparties fail to perform. To the extent that the Company
engages in hedging activities, it may be prevented from realizing the benefits
of favorable price changes in the physical market. However, it is similarly
insulated against decreases in such prices.

                                      F-17
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


   The Company has hedged a portion of its equity volumes of gas and NGLs in
1999, particularly in the first quarter, at pricing levels approximating its
1999 operating budget. The Company's equity hedging strategy establishes a
minimum and maximum price to the Company while allowing market participation
between these levels. As of February 19, 1999, the Company had hedged
approximately 75% of its anticipated equity gas for 1999 at a weighted average
NYMEX-equivalent minimum price of $2.00 per Mcf, including approximately 80% of
first quarter anticipated equity volumes at a weighted average NYMEX-equivalent
minimum price of $2.00 per Mcf. Additionally, the Company has hedged
approximately 75% of its anticipated equity NGLs for 1999 at a weighted average
composite Mont Belvieu and West Texas Intermediate Crude-equivalent minimum
price of $.23 per gallon.

   At December 31, 1998, the Company had $1.1 million of losses deferred in
inventory that will be recognized primarily during the first quarter of 1999
and are expected to be offset by margins from the Company's related forward
fixed price hedges and physical sales. At December 31, 1998, the Company had
unrecognized net gains of $3.8 million related to financial instruments that
are expected to be offset by corresponding unrecognized net losses from the
Company's obligations to sell physical quantities of gas and NGLs.

   The Company enters into speculative futures, swap and option trades on a
very limited basis for purposes that include testing of hedging techniques. The
Company's policies contain strict guidelines for such trading including
predetermined stop-loss requirements and net open positions limits. Speculative
futures, swap and option positions are marked to market at the end of each
accounting period and any gain or loss is recognized in income for that period.
Net gains or losses from such speculative activities for the years ended
December 31, 1998 and 1997 were not material.

Natural Gas Derivative Market Risk

   As of December 31, 1998, the Company held a notional quantity of
approximately 370 Bcf of natural gas futures, swaps and options extending from
January 1999 to December 2000 with a weighted average duration of approximately
four months. This was comprised of approximately 178 Bcf of long positions and
192 Bcf of short positions in such instruments. As of December 31, 1997, the
Company held a notional quantity of approximately 480 Bcf of natural gas
futures, swaps and options extending from January 1998 to December 1999 with a
weighted average duration of approximately four months. This was comprised of
approximately 230 Bcf of long positions and 250 Bcf of short positions in such
instruments.

Crude Oil and NGL Derivative Market Risk

   As of December 31, 1998, the Company held a notional quantity of
approximately 177 million gallons of NGL futures, swaps and options extending
from January 1999 to December 1999 with a weighted average duration of
approximately six months. This was comprised of approximately 129 million
gallons of long positions and 48 million gallons of short positions in such
instruments. As of December 31, 1997, the Company held a notional quantity of
approximately 148 million gallons of NGL futures, swaps and options extending
from January 1998 to December 1998 with a weighted average duration of
approximately five months. This was comprised of approximately 93 million
gallons of long positions and 55 million gallons of short positions in such
instruments.

                                      F-18
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


   As of December 31, 1998, the Company had sold 90,000 barrels per month of
NYMEX crude swaps for 1999 at an average price of $13.10 per barrel. In
addition, the Company had purchased 90,000 barrels per month of $15.00 per
barrel NYMEX calls for July 1999 through December 1999 settlement. The Company
held no crude oil futures, swaps, or options for settlement beyond 1999.

   As of December 31, 1998, the Company had purchased 200,000 barrels per month
of OPIS Mt. Belvieu monthly average settlement $0.210 per gallon puts to hedge
a portion of the Company's equity production of propane and butanes for 1999.

   As of December 31, 1998, the Company had purchased 50,000 barrels per month
of OPIS Mt. Belvieu monthly average settlement $0.155 per gallon of purity
ethane puts to hedge a portion of the Company's equity production of ethane for
1999.

   As of December 31, 1998, the Company held no NGL futures, swaps, or options
for settlement beyond 1999.

   As of December 31, 1998, the estimated fair value of the aforementioned
crude oil and NGL options held by the Company was approximately $315,000.

NOTE 5--DEBT

   The following summarizes the Company's consolidated debt at the dates
indicated (000s):

<TABLE>
<CAPTION>
                                             December 31,
                                           -----------------
                                             1998     1997
                                           -------- --------
           <S>                             <C>      <C>
           Master shelf and senior notes.. $269,381 $284,857
           Variable rate revolving credit
            facility......................  235,500  156,500
                                           -------- --------
             Total long-term debt......... $504,881 $441,357
                                           ======== ========
</TABLE>

   Revolving Credit Facility. The Company's variable rate Revolving Credit
Facility was restated and amended in May 1997. The Revolving Credit Facility is
with a syndicate of banks and provides for a maximum borrowing commitment of
$300 million, $235.5 million of which was outstanding at December 31, 1998. The
interest rate payable on the facility at December 31, 1998 was 6.2%. The
Company has reached an agreement with the agent bank on a term sheet for a
restated facility which will reflect the following changes. The restated
Revolving Credit Facility is with a syndicate of banks and will provide for an
aggregate borrowing commitment of $300 million consisting of a $100 million
364-day Revolving Credit Facility ("Tranche A") and a five year $200 million
Revolving Credit Facility ("Tranche B"). The Revolving Credit Facility will
bear interest at certain spreads over the Eurodollar rate, at the Federal Funds
rate plus .50% or at the agent bank's prime rate. The Company will have the
option to determine which rate will be used. The Company also will pay a
facility fee on the commitment. The interest rate spreads and facility fee will
be adjusted based on the Company's debt to capitalization ratio and will range
from .75% to 2.00%. Pursuant to the Revolving Credit Facility, the Company will
be required to maintain a debt to capitalization ratio of not more than 60%
through December 31, 2000 and of not more than 55% thereafter, and a senior
debt to capitalization ratio of not more than 40% beginning September 30, 1999
through December 31, 2001 and of not more than 35% thereafter. The agreement
also requires a ratio of EBITDA to interest and dividends on preferred stock as
of the end of any fiscal quarter of not less than 1.35 to 1.0 beginning June
30, 1999 increasing to 3.25 to 1.0 by December 31, 2002. Tranche A and Tranche
B will be reduced on a pro rata basis to a total of $250 million by September
30, 1999. The Revolving Credit Facility is guaranteed and will be secured via a
pledge of the stock of the Company's significant subsidiaries. Documentation
reflecting this agreement is expected to be completed on or

                                      F-19
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

about the end of the first quarter of 1999. The Company generally utilizes
excess daily funds to reduce any outstanding balances on the Revolving Credit
Facility and associated interest expense, and it intends to continue such
practice.

   Master Shelf Agreement. In December 1991, the Company entered into a Master
Shelf agreement (as amended and restated, the "Master Shelf") with The
Prudential Insurance Company of America ("Prudential"). Amounts outstanding
under the Master Shelf agreement at December 31, 1998 are as indicated in the
following table (000s):

<TABLE>
<CAPTION>
                                  Interest       Final
Issue Date                Amount    Rate        Maturity                  Principal Payments Due
- ----------               -------- -------- ------------------ -----------------------------------------------
<S>                      <C>      <C>      <C>                <C>
October 27, 1992........ $ 16,667  7.51%   October 27, 2000   $8,333 on each of October 27, 1999 through 2000
October 27, 1992........   25,000  7.99%   October 27, 2003   $8,333 on each of October 27, 2001 through 2003
September 22, 1993......   25,000  6.77%   September 22, 2003 single payment at maturity
December 27, 1993.......   25,000  7.23%   December 27, 2003  single payment at maturity
October 27, 1994........   25,000  9.05%   October 27, 2001   single payment at maturity
October 27, 1994........   25,000  9.24%   October 27, 2004   single payment at maturity
July 28, 1995...........   50,000  7.61%   July 28, 2007      $10,000 on each of July 28, 2003 through 2007
                         --------
                         $191,667
                         ========
</TABLE>

   In March 1999, the Company reached an agreement on an amendment with
Prudential which will be effective as of January 1999 with the following
provisions. The Company will be required to maintain a current ratio (as
defined therein) of at least 1.0 to 1.0, a minimum tangible net worth equal to
the sum of $300 million plus 50% of consolidated net earnings earned from
January 1, 1999 plus 75% of the net proceeds of any equity offerings after
January 1, 1999, and a debt to capitalization ratio of not more than 60%
through December 31, 2000 and of not more than 55% thereafter. A senior debt to
capitalization ratio will be implemented, if and when, the Company issues
subordinated debt. This amendment also requires an EBITDA to interest ratio of
not less than 1.75 to 1.0 beginning March 31, 1999 increasing to a ratio of not
less than 3.75 to 1.0 by March 31, 2002. Documentation reflecting this
amendment is expected to be completed on or about the end of the first quarter
of 1999. In addition, under the existing agreement, the Company is prohibited
from declaring or paying dividends that in the aggregate exceed the sum of $50
million plus 50% of consolidated net income earned after June 30, 1995 (or
minus 100% of a net loss), plus the aggregate net cash proceeds received after
June 30, 1995 from the sale of any stock. At December 31, 1998, $51.5 million
was available under this limitation. This amount is expected to be reduced by
approximately $14.9 million as a result of the after-tax losses recognized on
the sales of the Giddings and Katy facilities. The Company presently intends to
finance the $8.3 million payment due on October 27, 1999 with amounts available
under the Revolving Credit Facility. The Master Shelf Agreement is guaranteed
and will be secured via a pledge of the stock of the Company's significant
subsidiaries.

   1995 Senior Notes. In 1995, the Company sold $42 million of Senior notes
(the "1995 Senior notes") to a group of insurance companies with an interest
rate of 8.16% per annum. In February 1999, the Company offered to prepay the
1995 Senior notes at par. Note holders representing $15 million of the
principal amount outstanding on the 1995 Senior notes accepted the Company's
offer and were paid in full in March 1999. These payments were financed by the
Bridge Loan and by amounts available under the Revolving Credit Facility. The
remaining principal amount outstanding of $27 million is due in a single
payment in December 2005. The 1995 Senior notes are guaranteed and will be
secured via a pledge of the stock of the Company's significant subsidiaries.
The Company has reached an agreement with the note holders which provides for
certain financial

                                      F-20
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

covenants on terms that will be no more restrictive than those contained in the
Master Shelf. Documentation reflecting this agreement is expected to be
completed on or about the end of the first quarter of 1999.

   Effective January 1, 1999, the Company will pay an annual fee of no more
than .65% on the amounts outstanding on the Master Shelf and the 1995 Senior
notes. This fee will continue until the Company has received an implied
investment grade rating on its senior secured debt.

   1993 Senior Notes. In 1993, the Company sold $50 million of 7.65% Senior
notes (the "1993 Senior notes") to a group of insurance companies. Scheduled
annual principal payments of $7.1 million on the 1993 Senior notes were made on
April 30 of 1997 and 1998. In February 1999, the Company offered to prepay the
1993 Senior notes at par. Note holders representing approximately $33.5 million
of the total principal amount outstanding of $35.6 million accepted the
Company's offer and were paid in full in February 1999. These payments were
financed by a $37 million Bridge Loan. The Company intends to pay the remaining
outstanding principal of $2.1 million in the second quarter of 1999 with
amounts available under the Revolving Credit Facility.

   Bridge Loan. In February 1999, in order to finance prepayments at par of
amounts outstanding on the 1993 and 1995 Senior notes, the Company entered into
a Bridge Loan agreement in the amount of $37 million with its agent bank (the
"Bridge Loan"). The Bridge Loan bears interest at certain spreads over the
Eurodollar rate ranging from 1.75% at date of issuance to 2.75% at maturity.
The Bridge Loan may be prepaid in whole or in part at any time and matures on
October 31, 1999. The Company presently intends to finance the payment of the
Bridge Loan with amounts available under the Revolving Credit Facility,
proceeds from the sale of assets or proceeds from the issuance of public debt.

   Covenant Compliance. At December 31, 1998, the Company was in compliance
with all covenants in its loan agreements. Taking into account all the
covenants contained in these agreements, the Company had approximately $64.5
million of available borrowing capacity at December 31, 1998. In March 1999,
the Company successfully completed negotiations with its lenders for amendments
to its various financing facilities providing for financial flexibility and
covenant modifications. These amendments were needed given the depressed
commodity pricing experienced by the industry in general and the disappointing
results the Company has experienced at its Bethel Treating facility. There can
be no assurance that further amendments or waivers can be obtained in the
future, if necessary, or that the terms would be favorable to the Company. To
strengthen credit ratings and to reduce its overall debt outstanding, the
Company will continue to dispose of non-strategic assets (such as the Giddings
and Katy facilities) and investigate alternative financing sources (including
the issuance of public debt, project-financing, joint ventures and operating
leases).

   Approximate future maturities of long-term debt at the date indicated, which
do not reflect the payments made in the first quarter of 1999, are as follows
at December 31, 1998 (000s):

<TABLE>
             <S>                              <C>
             1999............................ $ 15,476
             2000............................   15,477
             2001............................   40,476
             2002............................  250,976
             2003............................   75,476
             Thereafter......................  107,000
                                              --------
               Total......................... $504,881
                                              ========
</TABLE>

                                      F-21
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


NOTE 6--FINANCIAL INSTRUMENTS

   The estimated fair values of the Company's financial instruments have been
determined by the Company using available market information and valuation
methodologies. Considerable judgment is required to develop the estimates of
fair value; thus, the estimates provided herein are not necessarily indicative
of the amount that the Company could realize upon the sale or refinancing of
such financial instruments.

<TABLE>
<CAPTION>
                                           December 31, 1998 December 31, 1997
                                           ----------------- -----------------
                                           Carrying   Fair   Carrying   Fair
                                            Value    Value    Value    Value
                                           -------- -------- -------- --------
                                                (000s)             (000s)
      <S>                                  <C>      <C>      <C>      <C>
      Cash and cash equivalents........... $  4,400 $  4,400 $ 19,777 $ 19,777
      Trade accounts receivable...........  233,574  233,574  258,791  258,170
      Accounts payable....................  245,315  245,315  326,696  326,696
      Long-term debt......................  504,881  503,001  441,357  447,843
      Risk management contracts........... $    --  $  2,281 $    --  $ (2,189)
</TABLE>

   The following methods and assumptions were used by the Company in estimating
the fair value of its financial instruments:

 Cash and cash equivalents, trade accounts receivable and accounts payable

   Due to the short-term nature of these instruments, the carrying value
approximates the fair value.

 Long-term debt

   The Company's long-term debt was primarily comprised of fixed rate
facilities; for this portion, fair market value was estimated using discounted
cash flows based upon the Company's current borrowing rates for debt with
similar maturities. The remaining portion of the long-term debt was borrowed on
a revolving basis which accrues interest at current rates; as a result,
carrying value approximates fair value of the outstanding debt.

 Risk Management Contracts

   Fair value represents the amount at which the instrument could be exchanged
in a current arms-length transaction.

NOTE 7--INCOME TAXES

   The provision (benefit) for income taxes for the years ended December 31,
1998, 1997 and 1996 is comprised of (000s):

<TABLE>
<CAPTION>
                                                           1998    1997  1996
                                                         --------  ---- -------
      <S>                                                <C>       <C>  <C>
      Current:
        Federal......................................... $ (5,696) $268 $ 1,152
        State...........................................      --    --      --
                                                         --------  ---- -------
        Total Current...................................   (5,696)  268   1,152
                                                         --------  ---- -------
      Deferred:
        Federal.........................................  (31,272)  448  12,071
        State...........................................   (1,450)   17     467
                                                         --------  ---- -------
        Total Deferred..................................  (32,722)  465  12,538
                                                         --------  ---- -------
          Total tax provision (benefit)................. $(38,418) $733 $13,690
                                                         ========  ==== =======
</TABLE>

                                      F-22
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


   Temporary differences and carryforwards which give rise to the deferred tax
liabilities (assets) at December 31, 1998 and 1997 are as follows (000s):

<TABLE>
<CAPTION>
                                                               1998      1997
                                                             --------  --------
      <S>                                                    <C>       <C>
      Property and equipment...............................  $133,054  $158,258
      Differences between the book and tax basis of
       acquired assets.....................................    14,386    15,334
                                                             --------  --------
        Total deferred income tax liabilities..............   147,440   173,592
                                                             --------  --------
      Alternative Minimum Tax ("AMT") credit carryforwards.   (21,128)  (26,849)
      Net Operating Loss ("NOL") carryforwards.............   (78,291)  (66,000)
                                                             --------  --------
        Total deferred income tax assets...................   (99,419)  (92,849)
                                                             --------  --------
        Net deferred income taxes..........................  $ 48,021  $ 80,743
                                                             ========  ========
</TABLE>

   The differences between the provision (benefit) for income taxes at the
statutory rate and the actual provision (benefit) for income taxes for the
years ended December 31, 1998, 1997 and 1996 are summarized as follows (000s):

<TABLE>
<CAPTION>
                                         1998     %   1997   %     1996     %
                                       --------  ---- ----  ----  -------  ----
<S>                                    <C>       <C>  <C>   <C>   <C>      <C>
Income tax (benefit) at statutory
 rate................................  $(36,968) 35.0 $777  35.0  $14,570  35.0
State income taxes, net of federal
 benefit.............................    (1,450)  1.4   31   1.4      562   1.4
Permanent differences on asset write-
 downs...............................       --    --   --    --       --    --
Reduction of deferred income taxes to
 reflect adjustment in acquired NOL
 carryforward........................       --    --   --    --      (900) (2.2)
Adjustment to prior year income
 taxes...............................       --    --   --    --      (383)  (.9)
Other................................       --    --   (75) (3.4)    (159)  (.4)
                                       --------  ---- ----  ----  -------  ----
  Total..............................  $(38,418) 36.4 $733  33.0  $13,690  32.9
                                       ========  ==== ====  ====  =======  ====
</TABLE>

   At December 31, 1998 the Company had NOL carryforwards for Federal and State
income tax purposes and AMT credit carryforwards for Federal income tax
purposes of approximately $215.4 million and $21.1 million, respectively. These
carryforwards expire as follows (000s):

<TABLE>
<CAPTION>
             Expiration Dates          NOL      AMT
             ----------------        -------- -------
             <S>                     <C>      <C>
             2003................... $    170 $   --
             2004...................      413     --
             2005...................      943     --
             2006...................      478     --
             2007...................      --      --
             2008...................   12,179     --
             2009...................   56,308     --
             2010...................   59,857     --
             2011...................   16,221     --
             2012...................   39,033     --
             2018...................   29,807     --
             No expiration..........      --   21,128
                                     -------- -------
               Total................ $215,409 $21,128
                                     ======== =======
</TABLE>

   The Company believes that the NOL carryforwards and AMT credit carryforwards
will be utilized prior to their expiration because they are substantially
offset by existing taxable temporary differences reversing within

                                      F-23
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

the carryforward period or are expected to be realized by achieving future
profitable operations based on the Company's dedicated and owned reserves, past
earnings history, projections of future earnings and current assets.

NOTE 8--COMMITMENTS AND CONTINGENT LIABILITIES

 McMurry Oil Company, et al. v. TBI Exploration, Inc., Mountain Gas Resources,
    Inc. and Wildhorse Energy Partners, LLC, District Court, Ninth Judicial
           District, Sublette County, Wyoming, Civil Action No. 5882.

   McMurry Oil Company and certain other producers (collectively, "McMurry")
filed suit against TBI Exploration, Inc. ("TBI"), Mountain Gas Resources, Inc.,
our wholly-owned subsidiary ("Mountain Gas") and Wildhorse Energy Partners, LLC
("Wildhorse"). The central dispute in this case concerns the ownership, nature
and extent of a call on certain gas and the right to match offers for gathering
and/or purchasing gas (collectively the "Preferential Rights"). In November
1998, the court granted summary judgment in favor of McMurry as to the
ownership of the Preferential Rights. In early 1999, McMurry, TBI and Wildhorse
settled their claims and crossclaims and as a result TBI and Wildhorse were
dismissed from the case. Trial on the liability phase of the litigation between
McMurry and Mountain Gas was held in May 1999 and judgment was rendered against
Mountain Gas in June 1999, assessing liability for intentional interference of
business expectancies and opportunities and a finding that such interference
caused McMurry to forego or delay entry into these opportunities and further,
that Mountain Gas' assertion of ownership of Preferential Rights were false and
thereby disparaged McMurry's title and rights. The court ruled that McMurry was
entitled to seek damages against Mountain Gas and that the damages may include
punitive damages. McMurry has submitted damage claims in this matter of
approximately $29 million, not including punitive damages. Mountain Gas has
filed a motion to reconsider the applicability of punitive damages in this
matter. A determination of the extent and amount of damages, including
causation and mitigation, for McMurry's damage claims is set for a jury trial
in January 2000. Mountain Gas believes the damage claims are excessive and
unjustified and will vigorously defend its actions and the damage claims raised
by McMurry in this matter. Under the terms of the court's order, Mountain Gas
is not permitted to file any appeal until the damage claims have been
litigated. Mountain Gas believes it has several grounds for appeal in this
matter. At the present time, it is not possible to express an opinion as to the
final outcome of this litigation or to estimate the final amount of damages, if
any, to be assessed in this matter.

   Berco Resources, Inc. v. Amerada Hess Corporation and Western Gas Resources,
Inc., United States District Court, District of Colorado, Civil Action No. 97-
WM-1332. Berco Resources, Inc. is an independent producer and marketer of
natural gas and alleges that it owns or has the right to produce and sell
natural gas in the Temple/Tioga Area in North Dakota. Berco alleges that
Amerada Hess engaged in unlawful monopolization under Section 2 of the Sherman
Act and Section 7 of the Clayton Act by acquiring natural gas gathering and
producing facilities owned by the Company. Berco alleges that the Company,
along with Amerada Hess, have conspired, through the purchase and sale of our
facilities in the Temple/Tioga Area, to create a monopoly affecting an
appreciable amount of interstate commerce in violation of Sections 1 and 2 of
the Sherman Act. Berco seeks an award against Amerada Hess and the Company of
threefold the amount of damages actually sustained by Berco, in an amount to be
determined at trial, and/or divestiture of the assets which Amerada Hess
acquired, for an order restraining and enjoining the Company and Amerada Hess
from violating the antitrust laws, and for costs, attorney fees and interest.
The Company believes that it has meritorious defenses to the claims and is
vigorously defending such claims. At the present time it is not possible to
predict the outcome of this litigation to estimate the amount of potential
damages.

   Internal Revenue Service. The Internal Revenue Service has completed its
examination of the Company's tax returns for the years 1990 and 1991 and has
proposed adjustments to taxable income reflected

                                      F-24
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

in such tax returns that would shift the recognition of certain items of income
and expense from one year to another. To the extent taxable income in a prior
year is increased by proposed timing adjustments, taxable income may be reduced
by a corresponding amount in other years. However, the Company would incur an
interest charge as a result of such adjustments. The Company currently is
protesting certain of these proposed adjustments. In the opinion of management,
any proposed adjustments for the additional income taxes and interest that may
result would not be material. However, it is reasonably possible that the
ultimate resolution could result in an amount which differs materially from
management's estimates.

   Other. The Company is involved in various other litigation and
administrative proceedings arising in the normal course of business. In the
opinion of management, any liabilities that may result from these claims, will
not, individually or in the aggregate, have a material adverse effect on its
financial position or results of operations.

NOTE 9--BUSINESS SEGMENTS AND RELATED INFORMATION

   The Company operates in four principal business segments, as follows: Gas
Gathering and Processing, Producing Properties, Marketing and Transmission, and
these segments are separately monitored by management for performance against
its internal forecast and are consistent with the Company's internal financial
reporting package. These segments have been identified based upon the differing
products and services, regulatory environment and the expertise required for
these operations.

   The Gas Gathering and Processing segment connects producers' wells to its
gathering systems for delivery to its processing or treating plants, processes
the natural gas to extract NGLs and treats the natural gas in order to meet
pipeline specifications. The residue gas and NGLs extracted at the processing
facilities are sold by the Marketing segment.

   The activities of the Producing Properties segment includes the exploration
and development of certain oil and gas producing properties in basins where the
Company's facilities are located. The majority of the gas and oil produced from
these properties is sold by the Marketing segment.

   The Marketing segment buys and sells gas and NGLs nationwide and in Canada,
providing storage, transportation, scheduling, peaking and other services to
our customers. In addition, this segment also markets gas and NGLs produced by
the Company's facilities. The gains and losses from any hedges on equity gas
and NGL volumes are included in this segments results. The operations
associated with the Katy Facility and the loss from the sale of this facility
are included in the Marketing segment, as are our Canadian marketing operations
(which are immaterial for separate presentation).

   The Transmission segment reflects the operations of the Company's MIGC and
MGTC pipelines. The majority of the revenue presented in this segment is
derived from transportation of residue gas.

                                      F-25
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


   The following table sets forth the Company's segment information as of and
for the six months ended June 30, 1999 and 1998 and the years ended December
31, 1998, 1997 and 1996 (in 000s). Due to the Company's integrated operations,
the use of allocations in the determination of business segment information is
necessary. Intersegment revenues are valued at prices comparable to those of
unaffiliated customers.

<TABLE>
<CAPTION>
                             Gas
                          Gathering
                             and     Producing                                     Eliminating
                          Processing Properties Marketing   Transmission Corporate   Entries     Total
                          ---------- ---------- ----------  ------------ --------- ----------- ----------
<S>                       <C>        <C>        <C>         <C>          <C>       <C>         <C>
Six months ended June
 30, 1999
Revenues from
 unaffiliated customers.   $ 23,131   $  1,080  $  855,451    $ 3,696     $ 1,722   $     (29) $  885,051
Interest income.........          1        --           24        --       13,308     (13,190)        143
Other, net..............     (4,789)       --      (16,460)       --          --          --      (21,249)
Intersegment sales......    163,205     13,083      38,940      8,182         --     (223,410)        --
                           --------   --------  ----------    -------     -------   ---------  ----------
Total revenues..........    181,548     14,163     877,955     11,878      15,030    (236,629)    863,945
                           --------   --------  ----------    -------     -------   ---------  ----------
Product purchases.......    127,799        899     889,180        518      (1,501)   (221,717)    795,178
Plant operating expense.     24,920      1,002       1,673      5,371       1,916      (1,363)     33,519
Oil and gas exploration
 and production expense.        --       3,597         (44)       --          130         --        3,683
                           --------   --------  ----------    -------     -------   ---------  ----------
Operating profit........   $ 28,829   $  8,665  $  (12,854)   $ 5,989     $14,485   $ (13,549) $   31,565
                           ========   ========  ==========    =======     =======   =========  ==========
Depreciation, depletion
 and amortization.......                                                                           24,755
Interest expense........                                                                           15,753
Selling and
 administrative expense.                                                                           15,952
                                                                                               ----------
Income (loss) before
 income taxes...........                                                                       $  (24,895)
                                                                                               ==========
Identifiable assets.....   $510,070   $ 95,226  $       94    $67,993     $36,758   $     --   $  710,141
                           ========   ========  ==========    =======     =======   =========  ==========

<CAPTION>
                             Gas
                          Gathering
                             and     Producing                                     Eliminating
                          Processing Properties Marketing   Transmission Corporate   Entries     Total
                          ---------- ---------- ----------  ------------ --------- ----------- ----------
<S>                       <C>        <C>        <C>         <C>          <C>       <C>         <C>
Six months ended June
 30, 1998
Revenues from
 unaffiliated customers.   $ 17,951   $    860  $1,041,419    $ 3,320     $   346   $     548  $1,064,444
Interest income.........        --         --          --         --       19,171     (18,421)        750
Other, net..............     15,397        703         (52)       (16)        --          --       16,032
Intersegment sales......    225,303     13,337      43,934      5,488         --     (288,062)        --
                           --------   --------  ----------    -------     -------   ---------  ----------
Total revenues..........    258,651     14,900   1,085,301      8,792      19,517    (305,935)  1,081,226
                           --------   --------  ----------    -------     -------   ---------  ----------
Product purchases.......    173,987        720   1,072,777         91      (2,030)   (283,263)    962,282
Plant operating expense.     30,978      1,339       2,880      5,317       2,435      (4,102)     38,847
Oil and gas exploration
 and production expense.         (1)     2,968           7        --            3          18       2,995
                           --------   --------  ----------    -------     -------   ---------  ----------
Operating profit........   $ 53,687   $  9,873  $    9,637    $ 3,384     $19,109   $ (18,588) $   77,102
                           ========   ========  ==========    =======     =======   =========  ==========
Depreciation, depletion
 and amortization.......                                                                           29,328
Interest expense........                                                                           16,296
Selling and
 administrative expense.                                                                           14,907
                                                                                               ----------
Income (loss) before
 income taxes...........                                                                       $   16,571
                                                                                               ==========
Identifiable assets.....   $681,841   $119,757  $  120,470    $53,234     $29,847   $     --   $1,005,149
                           ========   ========  ==========    =======     =======   =========  ==========
</TABLE>

                                      F-26
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


<TABLE>
<CAPTION>
                             Gas
                          Gathering
                             and     Producing                                    Eliminating
                          Processing Properties Marketing  Transmission Corporate   Entries     Total
                          ---------- ---------- ---------- ------------ --------- ----------- ----------
<S>                       <C>        <C>        <C>        <C>          <C>       <C>         <C>
Year ended December 31,
 1998
Revenues from
 unaffiliated customers.   $ 38,613   $ 1,979   $2,067,561   $ 4,956     $ 1,091   $    709   $2,114,909
Interest income.........          1       --            45       --       29,531    (28,486)       1,091
Other, net..............     16,759       703          120       (16)        --         --        17,566
Intersegment sales......    425,895    24,878       81,384    12,365         --    (544,522)         --
                           --------   -------   ----------   -------     -------   --------   ----------
Total revenues..........    481,268    27,560    2,149,110    17,305      30,622   (572,299)   2,133,566
                           --------   -------   ----------   -------     -------   --------   ----------
Product purchases.......    330,369     1,368    2,126,621       --       (3,386)  (540,669)   1,914,303
Plant operating expense.     65,318     2,437        6,999    11,167       2,694     (3,262)      85,353
Oil and gas exploration
 and production expense.                7,466          155       --          233        142        7,996
                           --------   -------   ----------   -------     -------   --------   ----------
Operating profit........   $ 85,581   $16,289   $   15,335   $ 6,138     $31,081   $(28,510)  $  125,914
                           ========   =======   ==========   =======     =======   ========   ==========
Depreciation, depletion
 and amortization.......                                                                          59,346
Interest expense........                                                                          33,616
Loss on the impairment
 of property and
 equipment..............                                                                         108,447
Selling and
 administrative expense.                                                                          30,128
                                                                                              ----------
Income (loss) before
 income taxes...........                                                                      $ (105,623)
                                                                                              ==========
Identifiable assets.....   $577,782   $89,191   $  118,661   $63,946     $17,780   $    --    $  867,360
                           ========   =======   ==========   =======     =======   ========   ==========
</TABLE>

                                      F-27
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


<TABLE>
<CAPTION>
                             Gas
                          Gathering
                             and     Producing                                    Eliminating
                          Processing Properties Marketing  Transmission Corporate   Entries     Total
                          ---------- ---------- ---------- ------------ --------- ----------- ----------
<S>                       <C>        <C>        <C>        <C>          <C>       <C>         <C>
Year ended December 31,
 1997
Revenues from
 unaffiliated Customers.   $ 33,180   $  1,189  $2,333,064   $ 5,457     $   780   $  3,871   $2,377,541
Interest income.........         18        --          114       --       17,556    (16,460)       1,228
Other, net..............      1,094      4,727         132       --          538        --         6,491
Intersegment sales......    522,783     34,123      51,411     7,419         --    (615,736)         --
                           --------   --------  ----------   -------     -------   --------   ----------
Total revenues..........    557,075     40,039   2,384,721    12,876      18,874   (628,325)   2,385,260
                           --------   --------  ----------   -------     -------   --------   ----------
Product purchases.......    399,651      1,238   2,352,107     4,409      (2,558)  (608,417)   2,146,430
Plant operating expense.     63,749      2,912       6,597     6,394       1,814     (3,353)      78,113
Oil and gas exploration
 and Production expense.          7      7,634         106       --            3        (36)       7,714
                           --------   --------  ----------   -------     -------   --------   ----------
Operating profit........   $ 93,668   $ 28,255  $   25,911   $ 2,073     $19,615   $(16,519)  $  153,003
                           ========   ========  ==========   =======     =======   ========   ==========
Depreciation, depletion
 and Amortization.......                                                                          59,248
Interest expense........                                                                          27,474
Loss on the impairment
 of property and
 equipment..............                                                                          34,615
Selling and
 administrative expense.                                                                          29,446
                                                                                              ----------
Income (loss) before
 income taxes...........                                                                      $    2,220
                                                                                              ==========
Identifiable assets... .   $698,899   $104,744  $  121,305   $48,541     $13,723   $    --    $  987,212
                           ========   ========  ==========   =======     =======   ========   ==========

<CAPTION>
                             Gas
                          Gathering
                             and     Producing                                    Eliminating
                          Processing Properties Marketing  Transmission Corporate   Entries     Total
                          ---------- ---------- ---------- ------------ --------- ----------- ----------
<S>                       <C>        <C>        <C>        <C>          <C>       <C>         <C>
Year ended December 31,
 1996
Revenues from
 unaffiliated customers.   $ 45,828   $    764  $2,032,696   $ 5,187     $(2,785)  $  1,106   $2,082,796
Interest income.........        --         --          --        --       14,316    (13,663)         653
Other, net..............      2,748      2,807         106        (6)      1,905        --         7,560
Intersegment sales......    506,356     33,041      38,377     6,249         --    (584,023)         --
                           --------   --------  ----------   -------     -------   --------   ----------
Total revenues..........    554,932     36,612   2,071,179    11,430      13,436   (596,580)   2,091,009
                           --------   --------  ----------   -------     -------   --------   ----------
Product purchases.......    390,890        334   2,033,190     4,551      (5,948)  (578,866)   1,844,151
Plant operating expense.     63,980      2,774       7,238     4,266       1,539     (6,681)      73,116
Oil and gas exploration
 and production expense.        --       4,440         133       --          --         483        5,056
                           --------   --------  ----------   -------     -------   --------   ----------
Operating profit........   $100,062   $ 29,064  $   30,618   $ 2,613     $17,845   $(11,516)  $  168,686
                           ========   ========  ==========   =======     =======   ========   ==========
Depreciation, depletion
 and amortization.......                                                                          63,207
Interest expense........                                                                          34,437
Loss on the impairment
 of property and
 equipment                                                                                           --
Selling and
 administrative expense.                                                                          29,411
                                                                                              ----------
Income (loss) before
 income taxes...........                                                                      $   41,631
                                                                                              ==========
Identifiable assets.....   $598,453   $119,132  $  121,978   $36,110     $14,019   $    --    $  889,692
                           ========   ========  ==========   =======     =======   ========   ==========
</TABLE>

                                      F-28
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


NOTE 10--EMPLOYEE BENEFIT PLANS

 Profit Sharing Plan

   A discretionary profit sharing plan (a defined contribution plan) exists for
all Company employees meeting certain service requirements. The Company may
make annual discretionary contributions to the plan as determined by the Board
of Directors and provides for a match of 50% of employee contributions on the
first 4% of employee compensation contributed. Contributions are made to
common/collective trusts for which Fidelity Management Trust Company acts as
trustee. The discretionary contributions made by the Company were $1.9 million,
$1.9 million and $1.7 million, for the years ended December 31, 1998, 1997 and
1996, respectively. The matching contributions were $668,000, $310,000 and
$256,000 for the years ended December 31, 1998, 1997 and 1996, respectively.

 Key Employees' Incentive Stock Option Plan and Non-employee Director Stock
 Option Plan

   Effective April 1987, the Board of Directors of the Company adopted a Key
Employees' Incentive Stock Option Plan ("Key Employee Plan") and a Non-Employee
Director Stock Option Plan ("Directors' Plan") that authorize the granting of
options to purchase 250,000 and 20,000 shares of the Company's Common Stock,
respectively. Under the plans, each of these options became exercisable as to
25% of the shares covered by it on the later of January 1, 1992 or one year
from the date of grant, subject to the continuation of the optionee's
relationship with the Company, and became exercisable as to an additional 25%
of the covered shares on the later of each subsequent January 1 through 1995 or
on each subsequent date of grant anniversary, subject to the same condition.
Each of these plans will terminate on the earlier of February 6, 2000 or the
date on which all options granted under each of the plans have been exercised
in full. The Company has entered into agreements committing the Company to loan
certain employees an amount sufficient to exercise their options as each
portion of their options vests. The Company will forgive such loans and
associated accrued interest if the employee has been continuously employed by
the Company for four years after the date of each loan increment. In January
1999, the Board of Directors voted to extend the maturity for all such loans
for officers still employed in January 1999, until January 2001. During 1996,
under the terms of a severance agreement, the Company extended the maturity
date of one former officer's loans to December 31, 2000. In addition, under the
terms of a severance agreement, the loans of a former officer are being
forgiven over the life of the original loan forgiveness schedule. As of
December 31, 1998 and 1997, loans related to 81,250 and 112,500 shares of
Common Stock, respectively, totaling $870,000 and $1.2 million, respectively,
were outstanding under these terms.

 1993 and 1997 Stock Option Plans

   The 1993 Stock Option Plan ("1993 Plan") became effective on May 24, 1993
and the 1997 Stock Option Plan ("1997 Plan") became effective on May 21, 1997
after approvals by the Company's stockholders. Each plan is intended to be an
incentive stock option plan in accordance with the provisions of Section 422 of
the Internal Revenue Code of 1986, as amended. The Company has reserved
1,000,000 shares of Common Stock for issuance upon exercise of options under
each of the 1993 Plan and the 1997 Plan. The 1993 Plan and the 1997 Plan will
terminate on the earlier of March 21, 2003 and May 21, 2007, respectively, or
the date on which all options granted under each of the plans have been
exercised in full.

   Under both of the plans, the Board of Directors of the Company determines
and designates from time to time those employees of the Company to whom options
are to be granted. If any option terminates or expires prior to being
exercised, the shares relating to such option are released and may be subject
to reissuance pursuant to a new option. The Board of Directors has the right
to, among other things, fix the price, terms and conditions for the grant or
exercise of any option. The purchase price of the stock under each option shall
be

                                      F-29
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

the fair market value of the stock at the time such option is granted. Under
the 1993 Plan, options granted vest 20% each year on the anniversary of the
date of grant commencing with the first anniversary. Under the 1997 Plan, the
Board of Directors has the authority to set the vesting schedule from 20% per
year to 33 1/3% per year. Under both plans, the employee must exercise the
option within five years of the date each portion vests.

 $5.40 Stock Option Plan

   In April 1987 and amended in February 1994, the Partnership adopted an
employee option plan ("$5.40 Plan") that authorized granting options to
employees to purchase 483,000 common units in the Partnership. Pursuant to the
Restructuring, the Company assumed the Partnership's obligation under the
employee option plan. The plan was amended upon the Restructuring to allow each
holder of existing options to exercise such options and acquire one share of
Common Stock for each common unit they were originally entitled to purchase.
The exercise price and all other terms and conditions for the exercise of such
options issued under the amended plan were the same as under the plan, except
that the Restructuring accelerated the time upon which certain options may be
exercised. All options under the plan were either exercised or forfeited on or
before May 31, 1997. The Company has entered into agreements committing the
Company to loan to certain employees an amount sufficient to exercise their
options, provided that the Company will not loan in excess of 25% of the total
amount available to the employee in any one year. In accordance with the
agreements, the Company forgave the majority of such loans and associated
accrued interest on July 2, 1997. Under the terms of a severance agreement, the
Company extended the maturity date of one former officer's loans to December
31, 2000. As of December 31, 1998 and 1997, loans related to 15,000 shares of
Common Stock in each year, respectively, totaling $81,000, were outstanding
under these terms.

   The following table summarizes the number of stock options exercisable and
available for grant under the Company's benefit plans:

<TABLE>
<CAPTION>
                                               Key
                                      $5.40  Employee Directors'  1993    1997
                                       Plan    Plan      Plan     Plan    Plan
                                      ------ -------- ---------- ------- -------
<S>                                   <C>    <C>      <C>        <C>     <C>
Exercisable:
  December 31, 1996.................. 33,148  56,250    11,000   288,438     --
  December 31, 1997..................    --   75,000    12,250   448,171     --
  December 31, 1998..................    --   75,000    13,500   562,138  26,250

Available for Grant:
  December 31, 1996..................    --   31,250     1,250     4,734     --
  December 31, 1997..................    --   31,250     1,250     9,382 828,900
  December 31, 1998..................    --   31,250     1,250    96,609 763,400
</TABLE>

                                      F-30
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


   The following table summarizes the stock option activity under the Company's
benefit plans:

<TABLE>
<CAPTION>
                                                     Number of Shares
                                       ----------------------------------------------
                                                  Key
                           Per Share    $5.40   Employee Directors'   1993     1997
                          Price Range   Plan      Plan      Plan      Plan     Plan
                         ------------- -------  -------- ---------- --------  -------
<S>                      <C>           <C>      <C>      <C>        <C>       <C>
Balance 12/31/95........                47,571   75,000    13,500    688,061      --
  Granted............... $13.88-$18.63     --       --        --     351,733      --
  Exercised.............          5.40 (14,423)     --        --         --       --
  Forfeited or canceled.   13.25-35.00     --       --        --     (46,591)     --
                                       -------   ------    ------   --------  -------
Balance 12/31/96........                33,148   75,000    13,500    993,203      --
  Granted...............   17.75-24.00     --       --        --      64,654  171,100
  Exercised.............    5.40-23.50 (32,077)     --        --      (5,225)     --
  Forfeited or canceled.    5.40-34.13  (1,071)     --        --     (69,302)     --
                                       -------   ------    ------   --------  -------
Balance 12/31/97........                   --    75,000    13,500    983,330  171,100
  Granted...............         19.28     --       --        --      40,511  106,500
  Exercised.............         15.83     --       --        --      (1,556)     --
  Forfeited or canceled. $19.19-$21.78     --       --        --    (129,809) (41,000)
                                       -------   ------    ------   --------  -------
Balance 12/31/98........                   --    75,000    13,500    892,476  236,600
                                       =======   ======    ======   ========  =======
</TABLE>

   The following table summarizes the weighted average option exercise price
information under the Company's benefit plans:

<TABLE>
<CAPTION>
                                                 Key
                                         $5.40 Employee Directors'  1993   1997
                                         Plan    Plan      Plan     Plan   Plan
                                         ----- -------- ---------- ------ ------
<S>                                      <C>   <C>      <C>        <C>    <C>
Balance 12/31/95........................ $5.40  $30.23    $14.13   $25.11 $  --
  Granted...............................   --      --        --     14.63    --
  Exercised.............................  5.40     --        --       --     --
  Forfeited or canceled.................   --      --        --     27.05    --
                                         -----  ------    ------   ------ ------
Balance 12/31/96........................  5.40   30.23     14.13    21.31    --
  Granted...............................   --      --        --     19.71  19.63
  Exercised.............................  5.40     --        --     16.91    --
  Forfeited or canceled.................  5.40     --        --     25.54    --
                                         -----  ------    ------   ------ ------
Balance 12/31/97........................   --    30.23     14.13    20.93  19.63
  Granted...............................   --      --        --     19.28  11.69
  Exercised.............................   --      --        --     14.78    --
  Forfeited or canceled.................   --      --        --     21.97  19.16
                                         -----  ------    ------   ------ ------
Balance 12/31/98........................ $ --   $30.23    $14.13   $20.71 $16.15
</TABLE>

   SFAS No. 123 encourages companies to record compensation expense for stock-
based compensation plans at fair value. As permitted under SFAS No. 123, the
Company has elected to continue to measure compensation costs for such plans as
prescribed by APB No. 25. SFAS No. 123 requires pro forma disclosures for each
year a statement of operations is presented. Such information was only
calculated for the options granted under the 1993 Plan and the 1997 Plan as
there were no grants under any other plans. The weighted average fair value of
options granted under the 1993 Plan of $0.37, $10.54 and $10.18 for the years
ended December 31, 1998, 1997 and 1996, respectively, and the weighted average
fair value of options granted under the 1997 Plan of $1.00

                                      F-31
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

and $12.66 for the years ended December 31, 1998 and 1997, respectively was
estimated using the Black-Scholes option-pricing model with the following
assumptions:

<TABLE>
<CAPTION>
                                                     1993 Plan       1997 Plan
                                                   ----------------  ----------
                                                   1998  1997  1996  1998  1997
                                                   ----  ----  ----  ----  ----
      <S>                                          <C>   <C>   <C>   <C>   <C>
      Risk-free interest rate.....................  5.3%  6.1% 6.35%  5.3%  6.1%
      Expected life (in years)....................    5     6     7     6    10
      Expected volatility.........................   45%   42%   37%   45%   42%
      Expected dividends (quarterly).............. $.05  $.05  $.05  $.05  $.05
</TABLE>

   Had compensation expense for the Company's 1998, 1997 and 1996 grants for
stock-based compensation plans been determined consistent with the fair value
method under SFAS No. 123, the Company's net income (loss), income (loss)
attributable to common stock, earnings (loss) per share of common stock and
earnings (loss) per share of common stock--assuming dilution would approximate
the pro forma amounts below (000s, except per share amounts):

<TABLE>
<CAPTION>
                                1998                1997               1996
                          ------------------  -----------------  ----------------
                             As       Pro        As       Pro       As      Pro
                          Reported   forma    Reported   forma   Reported  forma
                          --------  --------  --------  -------  -------- -------
<S>                       <C>       <C>       <C>       <C>      <C>      <C>
Net income (loss).......  $(67,205) $(67,997) $ 1,487   $   941  $27,941  $27,891
Net income (loss)
 attributable to common
 stock..................   (77,644)  (78,436)  (8,952)   (9,498)  17,502   17,452
Earnings (loss) per
 share of common stock..     (2.42)    (2.44)    (.28)     (.30)     .66      .66
Earnings (loss) per
 share of common stock--
 assuming dilution......  $  (2.42) $  (2.44) $  (.28)  $  (.30) $   .66  $   .66
</TABLE>

   The 1993 Plan dictates that the options granted vest 20% each year on the
anniversary of the date of grant commencing with the first anniversary. The
Board of Directors has the authority to set the vesting schedule from 20% per
year to 33 1/3% per year for the 1997 Plan. All options granted in 1997 will
vest at the rate of 20% per year. As a result, no compensation expense, as
defined under SFAS No. 123, is recognized in the year options are granted. In
addition, the fair market value of the options at grant date is amortized over
this vesting period for purposes of calculating compensation expense.

                                      F-32
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


NOTE 11--SUPPLEMENTAL INFORMATION ON OIL AND GAS PRODUCING ACTIVITIES
     (UNAUDITED):

 Costs

   The following tables set forth capitalized costs at December 31, 1998, 1997
and 1996 and costs incurred for oil and gas producing activities for the years
ended December 31, 1998, 1997 and 1996 (000s):

<TABLE>
<CAPTION>
                                                    1998      1997      1996
                                                  --------  --------  --------
      <S>                                         <C>       <C>       <C>
      Capitalized costs:
        Proved properties........................ $110,090  $134,102  $140,871
        Unproved properties......................   33,255    18,464     8,064
                                                  --------  --------  --------
      Total......................................  143,345   152,566   148,935
        Less accumulated depletion...............  (58,994)  (61,766)  (58,548)
                                                  --------  --------  --------
      Net capitalized costs...................... $ 84,351  $ 90,800  $ 90,387
                                                  ========  ========  ========
      The Company's share of Redman Smackover's
       net capitalized costs..................... $    --   $  3,845  $  4,385
                                                  ========  ========  ========
      Costs incurred:
      Acquisition of properties
        Proved................................... $  2,174  $  7,499  $    242
        Unproved.................................   22,633    10,457       909
      Development costs..........................   23,208    13,134     3,893
      Exploration costs..........................    4,177     1,322     2,581
                                                  --------  --------  --------
      Total costs incurred....................... $ 52,192  $ 32,412  $  7,625
                                                  ========  ========  ========
      The Company's share of Redman Smackover's
       costs
       incurred.................................. $     72  $    236  $      8
                                                  ========  ========  ========
</TABLE>

 Results of Operations

   The results of operations for oil and gas producing activities, excluding
corporate overhead and interest costs, for the years ended December 31, 1998,
1997 and 1996 are as follows (000s):

<TABLE>
<CAPTION>
                                                    1998      1997      1996
                                                  --------  --------  --------
      <S>                                         <C>       <C>       <C>
      Revenues from sale of oil and gas:
        Sales.................................... $  2,592  $  5,970  $  1,821
        Transfers................................   23,188    25,571    31,733
                                                  --------  --------  --------
          Total..................................   25,780    31,541    33,554
      Production costs...........................   (6,611)   (6,384)   (4,256)
      Exploration costs..........................   (1,599)   (1,439)     (898)
      Depreciation, depletion and amortization...  (11,749)  (11,549)  (11,756)
      Impairment of oil and gas properties.......  (16,528)  (19,615)      --
      Income tax benefit (expense)...............    3,690     2,792    (6,261)
                                                  --------  --------  --------
      Results of operations...................... $  7,017  $ (4,654) $ 10,383
                                                  ========  ========  ========
      The Company's share of Redman Smackover's
       operations................................ $    421  $  1,265  $  1,745
                                                  ========  ========  ========
</TABLE>

                                      F-33
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


 Reserve Quantity Information

   Reserve estimates are subject to numerous uncertainties inherent in the
estimation of quantities of proved reserves and in the projection of future
rates of production and the timing of development expenditures. The accuracy of
such estimates is a function of the quality of available data and of
engineering and geological interpretation and judgment. Estimates of
economically recoverable reserves and of future net cash flows expected
therefrom prepared by different engineers or by the same engineers at different
times may vary substantially. Results of subsequent drilling, testing and
production may cause either upward or downward revisions of previous estimates.
Further, the volumes considered to be commercially recoverable fluctuate with
changes in commodity prices and operating costs. Any significant revision of
reserve estimates could materially adversely affect the Company's financial
condition and results of operations.

   The following table sets forth information for the years ended December 31,
1998, 1997 and 1996 with respect to changes in the Company's proved reserves,
all of which are in the United States. The Company has no significant
undeveloped reserves.

<TABLE>
<CAPTION>
                                                              Natural   Crude
                                                                Gas      Oil
                                                              (MMcf)   (MBbls)
                                                              -------  -------
      <S>                                                     <C>      <C>
      Proved reserves:
        December 31, 1995.................................... 108,820    715
        Revisions of previous estimates......................  (2,147)   286
        Purchases of reserves in place.......................   2,372    --
        Production........................................... (13,014)  (158)
                                                              -------   ----
        December 31, 1996....................................  96,031    843
        Revisions of previous estimates...................... (18,132)   (74)
        Extensions and discoveries........................... 113,251    191
        Purchases of reserves in place.......................  34,588    --
        Production........................................... (13,142)  (154)
                                                              -------   ----
        December 31, 1997.................................... 212,596    806
        Revisions of previous estimates......................  28,617   (200)
        Extensions and discoveries...........................  43,248     66
        Sales/Purchases of reserves in place, net............ (31,020)   --
        Production........................................... (14,511)  (117)
                                                              -------   ----
        December 31, 1998.................................... 238,930    555
                                                              =======   ====
      The Company's share of Redman Smackover's proved
       reserves:
        December 31, 1996....................................  10,811    --
                                                              =======   ====
        December 31, 1997....................................  10,218    --
                                                              =======   ====
        December 31, 1998....................................     --     --
                                                              =======   ====
</TABLE>

 Standardized Measures of Discounted Future Net Cash Flows

   Estimated discounted future net cash flows and changes therein were
determined in accordance with SFAS No. 69, "Disclosures about Oil and Gas
Producing Activities." Certain information concerning the assumptions used in
computing the valuation of proved reserves and their inherent limitations are
discussed below. The Company believes such information is essential for a
proper understanding and assessment of the data presented.

                                      F-34
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


   Future cash inflows are computed by applying year end prices of oil and gas
relating to the Company's proved reserves to the year end quantities of those
reserves. Future price changes are considered only to the extent provided by
contractual arrangements, including futures contracts, in existence at year
end.

   The assumptions used to compute estimated future net revenues do not
necessarily reflect the Company's expectations of actual revenues or costs, nor
their present worth. In addition, variations from the expected production rate
also could result directly or indirectly from factors outside of the Company's
control, such as unintentional delays in development, changes in prices or
regulatory controls. The reserve valuation further assumes that all reserves
will be disposed of by production. However, if reserves are sold in place,
additional economic considerations could also affect the amount of cash
eventually realized.

   Future development and production costs are computed by estimating the
expenditures to be incurred in developing and producing the proved oil and gas
reserves at the end of the year, based on year end costs and assuming
continuation of existing economic conditions.

   Future income tax expenses are computed by applying the appropriate year end
statutory tax rates, with consideration of future tax rates already legislated,
to the future pre-tax net cash flows relating to the Company's proved oil and
gas reserves. Permanent differences in oil and gas-related tax credits and
allowances are recognized.

   An annual discount rate of 10% was used to reflect the timing of the future
net cash flows relating to proved oil and gas reserves.

   Information with respect to the Company's estimated discounted future cash
flows from its oil and gas properties for the years ended December 31, 1998,
1997 and 1996 is as follows (000s):

<TABLE>
<CAPTION>
                                                     1998      1997      1996
                                                   --------  --------  --------
      <S>                                          <C>       <C>       <C>
      Future cash inflows........................  $345,217  $352,491  $305,095
      Future production costs....................  (108,457) (118,056)  (54,306)
      Future development costs...................   (46,066)  (28,803)   (1,728)
      Future income tax expense..................   (33,749)  (32,614)  (37,870)
                                                   --------  --------  --------
      Future net cash flows......................   156,945   173,018   211,191
      10% annual discount for estimated timing of
       cash flows................................   (59,068)  (73,445) (100,474)
                                                   --------  --------  --------
      Standardized measure of discounted future
       net cash flows relating to proved oil and
       gas reserves..............................  $ 97,877  $ 99,573  $110,717
                                                   ========  ========  ========
      The Company's share of Redman Smackover's
       standardized measure of discounted future
       net cash flows relating to proved oil and
       gas reserves..............................  $    --   $  6,326  $  5,684
                                                   ========  ========  ========
</TABLE>

                                      F-35
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


   Principal changes in the Company's estimated discounted future net cash
flows for the years ended December 31, 1998, 1997 and 1996 are as follows
(000s):

<TABLE>
<CAPTION>
                                                   1998      1997       1996
                                                 --------  ---------  --------
      <S>                                        <C>       <C>        <C>
      January 1................................. $ 99,573  $ 110,717  $ 81,762
        Sales and transfers of oil and gas
         produced, net of production costs......  (19,170)   (25,157)  (29,298)
        Net changes in prices and production
         costs related to future production.....      367   (146,968)   61,888
        Development costs incurred during the
         period.................................   23,208     13,134     3,893
        Changes in estimated future development
         costs..................................  (33,723)   (26,875)   (2,057)
        Changes in extensions and discoveries...   23,336    158,314       --
        Revisions of previous quantity
         estimates..............................   35,438    (47,859)    2,554
        Sales/Purchases of reserves in place,
         net....................................  (38,251)    47,867     5,266
        Accretion of discount...................    9,957     11,072     8,176
        Net change in income taxes..............   (1,134)     5,256   (19,484)
        Other, net..............................   (1,724)        72    (1,983)
                                                 --------  ---------  --------
      December 31............................... $ 97,877  $  99,573  $110,717
                                                 ========  =========  ========
</TABLE>

NOTE 12--QUARTERLY RESULTS OF OPERATIONS (UNAUDITED):

   The following summarizes certain quarterly results of operations (000s,
except per share amounts):

<TABLE>
<CAPTION>
                                                                          Earnings (Loss)
                                                                           Per Share of
                                     Gross     Net        Earnings (Loss)  Common Stock-
                         Operating   Profit   Income       Per Share of      Assuming
                          Revenues    (a)     (Loss)       Common Stock      Dilution
                         ---------- -------  --------     --------------- ---------------
<S>                      <C>        <C>      <C>          <C>             <C>
1999 quarter ended:
  March 31.............. $  429,505 $13,259  $ (2,176)        $ (.15)         $ (.15)
  June 30...............    434,440  (6,449)  (14,764)          (.54)           (.54)
                         ---------- -------  --------         ------          ------
                           $863,945 $ 6,810  $(16,940)        $ (.69)         $ (.69)
                         ========== =======  ========         ======          ======
1998 quarter ended:
  March 31.............. $  580,455 $37,019  $ 13,185         $  .33          $  .33
  June 30...............    500,771  10,755    (2,645)          (.16)           (.16)
  September 30..........    516,259   8,307    (4,647)          (.23)           (.23)
  December 31...........    536,081  10,487   (73,098)(c)      (2.36)          (2.36)
                         ---------- -------  --------         ------          ------
                         $2,133,566 $66,568  $(67,205)        $(2.42)         $(2.42)
                         ========== =======  ========         ======          ======
1997 quarter ended:
  March 31.............. $  635,538 $30,847  $ 10,608         $  .25          $  .25
  June 30...............    463,575  15,508       878           (.05)           (.05)
  September 30..........    555,888  20,757     4,997            .07             .07
  December 31...........    730,259  26,643   (14,996)(b)       (.55)           (.55)
                         ---------- -------  --------         ------          ------
                         $2,358,260 $93,755  $  1,487         $ (.28)         $ (.28)
                         ========== =======  ========         ======          ======
</TABLE>

                                      F-36
<PAGE>

                          WESTERN GAS RESOURCES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Concluded)

- --------
(a) Excludes selling and administrative, interest and income tax expenses, loss
    on the impairment of property and equipment and extraordinary items.
(b) Includes a pre-tax, non-cash expense resulting from the evaluation of
    property and equipment in accordance with SFAS No. 121 of $34.6 million.
(c) Includes a pre-tax, non-cash expense resulting from the evaluation of
    property and equipment in accordance with SFAS No. 121 of $108.5 million.

                                      F-37
<PAGE>




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