LAKEHEAD PIPELINE CO LP
424B5, 2000-11-17
PIPE LINES (NO NATURAL GAS)
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<PAGE>   1

                                                FILED PURSUANT TO RULE 424(b)(5)
                                                      REGISTRATION NO. 333-59597

PROSPECTUS SUPPLEMENT

(TO PROSPECTUS DATED SEPTEMBER 21, 1998)

                                  $100,000,000

                          LAKEHEAD PIPE LINE COMPANY,
                              LIMITED PARTNERSHIP
                           7.9% SENIOR NOTES DUE 2012

                             ----------------------

     We will pay interest on the notes on May 21 and November 21 of each year,
beginning May 21, 2001. The notes will mature on November 21, 2012. We may
redeem the notes at any time, in whole or in part, at a redemption price equal
to the greater of the principal amount of the notes and the optional redemption
price described in this prospectus supplement. We will also pay accrued and
unpaid interest to the date of any redemption.

     The notes will be our senior unsecured obligations and will rank equally in
right of payment with all of our other unsecured and unsubordinated
indebtedness. As of September 30, 2000, as adjusted to give effect to this
offering and the use of the estimated net offering proceeds to repay
indebtedness under our revolving credit facility, we would have had $801 million
of total indebtedness. Of this indebtedness, a total of $501.2 million would
have been outstanding under our first mortgage notes and revolving credit
facility and, to the extent of the collateral securing that indebtedness, would
have been senior to the notes.

     INVESTING IN THE NOTES INVOLVES RISKS THAT ARE DESCRIBED IN THE "RISK
FACTORS" SECTION BEGINNING ON PAGE S-10 OF THIS PROSPECTUS SUPPLEMENT AND ON
PAGE 4 OF THE ACCOMPANYING PROSPECTUS.

                             ----------------------

<TABLE>
<CAPTION>
                                                      PER NOTE         TOTAL
                                                      --------         -----
<S>                                                   <C>           <C>         <C>
Public offering price(1)............................   99.824%      $99,824,000
Underwriting discount...............................     .675%         $675,000
Proceeds, before expenses, to us....................   99.149%      $99,149,000
</TABLE>

     (1) Plus accrued interest from November 21, 2000, if settlement occurs
         after that date

     Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined if this
prospectus supplement or the accompanying prospectus is truthful or complete.
Any representation to the contrary is a criminal offense.

     The notes will be ready for delivery in book-entry form only through the
facilities of The Depository Trust Company on or about November 21, 2000.

                             ----------------------

                              MERRILL LYNCH & CO.

ABN AMRO INCORPORATED
                            BANC OF AMERICA SECURITIES LLC
                                                  CHASE SECURITIES INC.

                             ----------------------

          The date of this prospectus supplement is November 16, 2000.
<PAGE>   2


            [MAP OF LAKEHEAD PIPELINE SYSTEM, ENBRIDGE PIPLINE SYSTEM
                          AND SYSTEMS OWNED BY OTHERS]



                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                PROSPECTUS SUPPLEMENT                                             PROSPECTUS
<S>                                                <C>      <C>                                                  <C>
Prospectus Supplement Summary...................... S-3     Available Information................................ 2
Use of Proceeds....................................S-11     Incorporation of Certain Documents by Reference...... 2
Capitalization.....................................S-11     Certain Forward-Looking Statements................... 3
Business...........................................S-12     Risk Factors......................................... 4
Description of Existing Indebtedness and                    The Partnership...................................... 8
 Credit Facilities.................................S-16     Use of Proceeds......................................10
Description of the Notes...........................S-17     Ratio of Earnings to Fixed Charges...................10
Underwriting.......................................S-22     Description of the Debt Securities...................11
Legal Matters......................................S-23     Plan of Distribution.................................21
                                                            Legal Matters........................................22
                                                            Experts..............................................22
</TABLE>


                                   ----------


     You should rely only on the information contained in this prospectus
supplement, the accompanying prospectus and the documents we have incorporated
by reference. If anyone provides you with different or inconsistent information,
you should not rely on it. We have not, and the underwriters have not,
authorized any other person to provide you with different information. We are
not, and the underwriters are not, making an offer to sell the notes in any
jurisdictions where the offer or sale is not permitted.


                                      S-2
<PAGE>   3
                          PROSPECTUS SUPPLEMENT SUMMARY


     This summary highlights information from this prospectus supplement and the
accompanying prospectus. It is not complete and may not contain all of the
information that you should consider before investing in the notes. This
prospectus supplement and the accompanying prospectus include specific terms of
the offering of the notes, information about our business and our financial
data. You should read the entire prospectus supplement, the accompanying
prospectus and the documents we have incorporated by reference carefully,
including the "Risk Factors" sections and our financial statements and the notes
to those statements, before making an investment decision.

     Unless the context otherwise requires, references in this prospectus
supplement and the accompanying prospectus to "we," "us," "our" and the
"Partnership" mean Lakehead Pipe Line Company, Limited Partnership.


                                 THE PARTNERSHIP

WHO WE ARE

     We are the operating subsidiary partnership of Lakehead Pipe Line Partners,
L.P., a publicly traded Delaware limited partnership. We own and operate a
regulated crude oil and natural gas liquids pipeline business in the United
States. Lakehead Pipe Line Company, Inc., an indirect wholly owned subsidiary of
Enbridge Inc. of Canada, serves as our general partner. We and Enbridge are
engaged in the transportation of crude oil and other liquid hydrocarbons through
the world's longest liquid petroleum pipeline system, which we refer to as the
"System." We own the United States portion of the System, which we refer to as
the "Lakehead System," and a subsidiary of Enbridge, Enbridge Pipelines Inc.,
owns the Canadian portion of the System. The System is the primary transporter
of crude oil from western Canada to the United States and is the only pipeline
system that transports crude oil from western Canada to eastern Canada. The
System serves all the major refining centers in the Great Lakes region of the
United States, as well as the Province of Ontario, Canada.

COMPETITIVE ADVANTAGES

     We believe that the Lakehead System has several advantages over other
transporters of crude oil with which we compete.

          o    The Lakehead System is among the lowest cost transporters of
               crude oil and natural gas liquids in North America based on costs
               per barrel mile transported.

          o    The Lakehead System's extensive length, large diameter pipe and
               the use of a number of parallel lines rather than a single line
               enables us to transport multiple types of crude oil more
               efficiently.

          o    The Lakehead System supplies western Canadian crude oil to the
               Midwest United States, an area that is experiencing rising crude
               oil demand and declining crude oil production. This area has
               historically provided producers of western Canadian crude oil
               with the highest return, or sales price less transportation
               costs, relative to other available United States markets.

PROSPECTS FOR GROWTH IN THE SUPPLY OF WESTERN CANADIAN CRUDE OIL

     We believe both the near- and long-term outlook for supplies of western
Canadian crude oil and increasing deliveries on the Lakehead System is positive.
In 1999, total crude oil production in the western Canadian region declined by
approximately 200,000 barrels per day from 1998 levels. This decline was caused
by the curtailment of exploration and production activity associated with the
low oil price environment in late 1998 and in 1999. During the last few months,
production has increased modestly, and we believe that production will continue
to grow. We base our belief largely upon a significant increase in oil well
completions in western Canada in recent periods. As a


                                      S-3
<PAGE>   4
leading indicator for crude oil production, oil well completions have increased
to approximately 3,900 in the first nine months of 2000 compared with
approximately 1,500 wells completed during the same period last year. We expect
this increased level of drilling for oil to continue into 2001.

     In the long term, we are well positioned to benefit from increases in crude
oil supply through a combination of existing capacity and planned future
expansion. Canada has substantial reserves of non-conventional hydrocarbon
resources consisting predominantly of oil sands deposits in the province of
Alberta. Firms involved in the production of heavy and synthetic crude oil from
the Alberta Oil Sands have announced expansion projects over the next 10 years
with value in excess of Cdn $30 billion and representing over 2 million barrels
per day of potential incremental production. If these projects are completed,
they are projected to provide substantial increases in the production of heavy
and synthetic crude oil in western Canada in the next several years. If these
increases in production occur, they will support the long-term utilization of
the Lakehead System.

     External forecasts for oil prices for the next several years also support a
resurgence in conventional exploration and production and ongoing development of
the Alberta Oil Sands. Forecasts for the West Texas Intermediate crude oil
benchmark indicate prices in the low-to-mid-twenty dollar per barrel range over
the next several years. We believe that these prices are more than sufficient to
sustain continued growth in crude oil production from the Western Canadian
Sedimentary Basin.

                              OUR BUSINESS STRATEGY

     The System serves as a strategic link between the western Canadian oil
fields and the markets of the Midwest United States and eastern Canada. In
response to market conditions, we plan to maintain the service capability of the
Lakehead System and to expand its capacity and efficiency where appropriate. To
the extent allowed under orders of the United States Federal Energy Regulatory
Commission, referred to as the "FERC," or by agreement with customers, we expect
to file additional tariff increases and surcharges from time to time to reflect
these ongoing expansions.

SYSTEM EXPANSION PROJECTS PREVIOUSLY COMPLETED

     Major capacity expansion projects completed in the last five years include:

          o    1996 System Expansion Program--This expansion program provided an
               additional 120,000 barrels per day of capacity on the Lakehead
               System from Superior to Chicago area markets (40,000 barrels of
               which were required to offset the impact of increased heavy crude
               oil volumes on deliverability). This expansion program, which
               increased delivery capability to Chicago area markets by
               approximately 80,000 barrels per day, was completed in December
               1996 at a cost of approximately $65 million.

          o    System Expansion Project II, or SEP II--This expansion was
               completed in early 1999. SEP II involved the construction of a
               new pipeline from our pipeline terminal at Superior, Wisconsin,
               to the Chicago market area at a cost of approximately $480
               million. The pipeline provides an additional 170,000 barrels per
               day of delivery capacity on the Lakehead System.

               Under a tariff agreement with our customers, we implemented a
               tariff surcharge that recovers the costs of, and provides an
               equity return on, the SEP II facilities. The tariff agreement
               allows us to earn a return on our SEP II equity investment that
               varies depending on the level of SEP II capacity utilization on
               the Canadian portion of the System.


                                      S-4
<PAGE>   5
SYSTEM EXPANSION PROJECTS RECENTLY COMPLETED OR UNDER DEVELOPMENT

     Terrace Expansion Program - We and Enbridge are undertaking a major
capacity expansion project we refer to as the Terrace expansion program. This
expansion program consists of a multi-stage expansion of both the United States
and Canadian portions of the System. We expect the Terrace program ultimately to
provide an additional net 350,000 barrels per day of capacity to the System.

     o    Phase I of the Terrace program was completed in 1999 and included
          construction of new 36-inch diameter pipeline facilities from
          Kerrobert, Saskatchewan to Clearbrook, Minnesota that added 170,000
          barrels per day of capacity. Our portion of the cost of Phase I was
          approximately $140 million.

     o    Enbridge has recently announced that Phase II of the program will
          proceed in 2001 with construction of facilities to increase capacity
          on the Canadian portion of the System. While Phase II does not involve
          construction on the Lakehead System, we expect to benefit directly
          from the approximate 40,000 barrel per day increase in capacity of the
          Canadian portion of the System as additional volumes from the Alberta
          Oil Sands come on stream. Subject to timely approval by the National
          Energy Board in Canada, we expect that Phase II will be placed into
          service in 2002. We expect that record delivery levels on the Lakehead
          System will be achieved by the end of 2001 and that existing capacity
          will be fully utilized in 2002.

     o    Phase III of the Terrace expansion program is primarily designed to
          increase heavy oil transportation capacity on the Lakehead System
          between Clearbrook, Minnesota and Superior, Wisconsin by approximately
          140,000 barrels per day. We expect this phase of the program to be
          required in 2003. This phase and other future expansion projects on
          the System are subject to on-going discussions with the producers.

     A tariff surcharge for Terrace of approximately $0.013 per barrel (for
light crude oil from the Canadian border to Chicago) went into effect on April
1, 1999. The tariff surcharge assumes that all three phases of the Terrace
project will be completed. If the Canadian Association of Petroleum Producers
does not provide notice on or before July 1, 2001 to proceed with the final
phase, the tariff agreement approved by the FERC provides that we will be
allowed to increase the tariff surcharge on a cost of service basis to allow
recovery of, and return on, our Terrace investment, including any revenue
variances between the application of the toll increment and the actual annual
Terrace cost of service.

ENBRIDGE PROJECTS

     Enbridge has also recently completed North American crude oil pipeline
projects that are related to the System. We believe that, although these
projects are not owned by us, they are complementary to and will result in
increased deliveries on the Lakehead System. These projects include:

     o    Enbridge Toledo--Enbridge has completed construction of a new pipeline
          that connects our facilities at Stockbridge, Michigan to two
          refineries in the Toledo, Ohio area. This pipeline has a capacity of
          80,000 barrels per day in heavy crude oil and commenced service in
          early February 1999.

     o    Enbridge Pipelines (Athabasca)--In March 1999, Enbridge completed
          construction of a new 30-inch diameter pipeline for the delivery of
          heavy crude oil from the Athabasca oil sands region near Fort
          McMurray, Alberta to Hardisty, Alberta. At Hardisty, the Athabasca
          pipeline accesses other pipeline systems including Enbridge's portion
          of the System in western Canada. This project provides new pipeline
          capacity to accommodate anticipated growth in production from the
          Alberta Oil Sands. When fully powered, the Athabasca pipeline is
          anticipated to have an ultimate capacity of approximately 570,000
          barrels per day. Enbridge has entered into a 30-year transportation
          arrangement with Suncor Energy Inc., the initial shipper on the
          Athabasca pipeline.


                                      S-5
<PAGE>   6
                               RECENT DEVELOPMENTS


RESULTS FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2000

     For the nine months ended September 30, 2000, our net income was $51.4
million, compared to $64.7 million for the same period in 1999, and operating
revenue was $232.0 million, compared to $234.0 million for the same period in
1999. These decreases resulted primarily from reduced deliveries, which were
partially offset by new tariffs for SEP II and Terrace. Deliveries averaged
1.331 million barrels per day for the first nine months of 2000, compared to
1.371 million barrels per day for the same period of 1999. System utilization,
measured in barrel miles, was 254 billion for the first nine months of 2000
compared to 265 billion for the first nine months of 1999. This reduced level of
deliveries and utilization resulted primarily from a decline in oil production
in western Canada caused by low crude oil prices in late 1998 and early 1999.
These low prices caused crude oil producers to drill fewer wells and generally
to limit their investment in oil producing facilities. The crude oil supply was
further adversely impacted by the effects of crude oil producer maintenance
shutdowns and wetter than normal weather in western Canada, which impacted oil
well tie-ins and other development activities. We expect this situation to
improve in 2001 and beyond. Please read "--Prospects for Growth in the Supply of
Western Canadian Crude Oil."

SAFETY REGULATIONS

     On November 3, 2000, the Department of Transportation issued new
regulations intended by the DOT to address the safety of liquids pipelines in
high consequence areas. The regulations require pipeline operators to assess the
integrity of hazardous liquid pipeline segments that, in the event of a leak or
failure, could adversely affect highly populated areas, areas unusually
sensitive to environmental impact and commercially navigable waterways. Under
the regulations, an operator is required, among other things, to conduct
baseline integrity assessment tests (such as internal inspections) within seven
years, conduct future integrity tests at typically five year intervals and
develop and follow a written risk-based integrity management program covering
the designated high consequence areas. We do not believe that any increased
costs of compliance with these regulations will materially affect our results of
operations.


                                   ----------


     Our principal executive offices are located at Lake Superior Place, 21 West
Superior Street, Duluth, Minnesota 55802-2067, and the telephone number at these
offices is (218) 725-0100. You may contact us through Mr. Tracy Barker of our
Investor Relations Department by phone at (403) 231-5949, toll-free at (877)
575-3282 or by facsimile at (403) 231-5989.


                                      S-6
<PAGE>   7
                                  THE OFFERING


SECURITIES OFFERED....................  $100,000,000 principal amount of 7.9%
                                        senior notes due 2012.

MATURITY DATE ........................  November 21, 2012.

INTEREST PAYMENT DATES................  May 21 and November 21 of each year,
                                        beginning May 21, 2001.

OPTIONAL REDEMPTION...................  We may redeem the notes at any time, in
                                        whole or in part, at a redemption price
                                        equal to the greater of the principal
                                        amount of the notes and the optional
                                        redemption price described in this
                                        prospectus supplement. We will also pay
                                        accrued and unpaid interest to the date
                                        of any redemption. Please read
                                        "Description of the Notes--Optional
                                        Redemption."

RANKING...............................  The notes:
                                        o   will be our senior unsecured
                                            indebtedness;

                                        o   will rank equally in right of
                                            payment with all of our existing and
                                            future unsecured and unsubordinated
                                            indebtedness;

                                        o   will be senior in right of payment
                                            to any future subordinated
                                            indebtedness; and

                                        o   are effectively junior to all of our
                                            existing secured indebtedness to the
                                            extent of the collateral securing
                                            that indebtedness. As of September
                                            30, 2000, we had total indebtedness
                                            of approximately $600 million under
                                            our first mortgage notes and
                                            revolving credit facility. As of
                                            such date, as adjusted to give
                                            effect to this offering and the use
                                            of the estimated net offering
                                            proceeds to repay indebtedness under
                                            our revolving credit facility,
                                            $501.2 million of outstanding
                                            indebtedness would, to the extent of
                                            the collateral securing that
                                            indebtedness, be senior to the
                                            notes.

RATINGS...............................  The notes have been assigned ratings of
                                        A- by Standard & Poor's and A3 by
                                        Moody's. Standard & Poor's and Moody's
                                        will continue to monitor these ratings
                                        and will make future adjustments to the
                                        extent warranted. A rating reflects only
                                        the view of Standard & Poor's or
                                        Moody's, as the case may be, and is not
                                        a recommendation to buy, sell or hold
                                        the notes. We cannot assure you that
                                        these ratings will be retained for any
                                        given period of time or that they will
                                        not be revised downward or withdrawn
                                        entirely.

COVENANTS.............................  We will issue the notes under an
                                        indenture containing covenants that
                                        limit:
                                               o  the creation of liens securing
                                                  indebtedness; and
                                               o  sale-leaseback transactions.
                                        These limitations will be subject to
                                        qualifications and exceptions. Please
                                        read "Description of the Debt
                                        Securities--Provisions Applicable Solely
                                        to Senior Debt Securities--Limitations
                                        on Liens" and "--Restriction on
                                        Sale-Leasebacks" in the accompanying
                                        prospectus.

USE OF PROCEEDS.......................  We estimate that we will receive net
                                        proceeds from this offering of
                                        $98.8 million. We will use the net
                                        proceeds to repay indebtedness under our
                                        revolving credit facility. Pending
                                        repayment of this indebtedness, we may
                                        invest a portion of the proceeds in
                                        short-term investment grade securities.
                                        We may reborrow funds under the
                                        revolving credit facility to fund
                                        capital expenditures and for working
                                        capital. Please read "Use of Proceeds."


RISK FACTORS..........................  An investment in the notes involves some
                                        risk. Please read "Risk Factors" in this
                                        prospectus supplement and in the
                                        accompanying prospectus.


                                      S-7
<PAGE>   8
                 SUMMARY HISTORICAL FINANCIAL AND OPERATING DATA

     We have derived the summary historical financial data as of and for each of
the years ended December 31, 1997, 1998 and 1999 from our audited financial
statements and related notes. We have derived the summary historical financial
data as of September 30, 1999 and 2000 and for the nine-month periods then ended
from our unaudited financial statements which, in the opinion of management,
include all adjustments necessary for a fair presentation of the data. The
results for the nine-month period ended September 30, 2000 are not necessarily
indicative of the results that may be expected for the full fiscal year. You
should read the information below in conjunction with "Management's Discussion
and Analysis of Financial Condition and Results of Operations" and our
historical financial statements and related notes appearing in our Annual Report
on Form 10-K for the year ended December 31, 1999 and our Quarterly Reports on
Form 10-Q for the first three quarters of 2000, which are incorporated by
reference in this prospectus supplement and the accompanying prospectus.

<TABLE>
<CAPTION>
                                                                                               NINE MONTHS
                                                            YEAR ENDED DECEMBER 31,        ENDED SEPTEMBER 30,
                                                       --------------------------------    --------------------
                                                         1997        1998        1999        1999        2000
                                                       --------    --------    --------    --------    --------
                                                                         (DOLLARS IN MILLIONS)
<S>                                                    <C>         <C>         <C>         <C>         <C>
INCOME STATEMENT DATA:
  Operating revenue ................................   $  282.1    $  287.7    $  312.6    $  234.0    $  232.0
                                                       --------    --------    --------    --------    --------
      Power, operating and administrative expenses..      133.9       140.9       124.5        89.1        92.7
      Depreciation .................................       40.1        41.4        57.8        42.9        45.8
                                                       --------    --------    --------    --------    --------
  Total operating expenses .........................      174.0       182.3       182.3       132.0       138.5
                                                       --------    --------    --------    --------    --------
  Operating income .................................      108.1       105.4       130.3       102.0        93.5
  Interest and other income ........................        9.7         5.9         3.4         2.7         2.8
  Interest expense .................................      (38.6)      (21.9)      (54.1)      (40.0)      (44.9)
                                                       --------    --------    --------    --------    --------
  Net income .......................................   $   79.2    $   89.4    $   79.6    $   64.7    $   51.4
                                                       ========    ========    ========    ========    ========

FINANCIAL POSITION DATA (AT PERIOD END):
  Cash and cash equivalents ........................   $  118.6    $   47.0    $   40.0    $   53.8    $   57.9
  Property, plant and equipment, net ...............      850.3     1,296.2     1,321.3     1,311.5     1,286.1
      Total assets .................................    1,063.1     1,414.2     1,413.5     1,426.4     1,400.1
  Long-term debt ...................................      463.0       814.5       784.5       774.5       799.5
  Partners' capital ................................      504.2       497.4       589.5       602.5       557.2

OTHER FINANCIAL DATA AND RATIOS:
  EBITDA (1) .......................................   $  148.2    $  146.8    $  188.1    $  144.9    $  139.3
  Cash flow from operating activities ..............      106.6       103.6       101.6        86.9        98.1
  Cash flow used in investing activities ...........     (101.7)     (427.9)      (91.1)      (80.4)      (11.5)
  Cash flow from (used in) financing activities ....       24.1       252.7       (17.5)        0.3       (68.7)
  Capital expenditures .............................      126.9       487.3        82.9        58.2        10.6
  Ratio of EBITDA to interest expense (2) ..........        3.8x        6.7x        3.5x        3.6x        3.1x
  Ratio of earnings to fixed charges (3) ...........        2.8x        2.3x        2.3x        2.4x        2.1x

OPERATING DATA:
  Barrel miles (billions) (4) ......................        389         391         350         265         254
  Deliveries (thousands of barrels per day) (5):
       United States ...............................        960         992         898         880         970
       Eastern Canada ..............................        552         570         471         491         361
                                                       --------    --------    --------    --------    --------
           Total ...................................      1,512       1,562       1,369       1,371       1,331
                                                       ========    ========    ========    ========    ========
</TABLE>

                                                   (Footnotes on following page)


                                      S-8
<PAGE>   9
(1)  EBITDA is defined for this purpose as operating income before depreciation.
     EBITDA is used as a supplemental financial measurement in the evaluation of
     our business and should not be considered as an alternative to net income
     as an indicator of our performance or as an alternative to cash flow as a
     measure of liquidity. EBITDA is presented here to provide additional
     information.

(2)  The ratio of EBITDA to interest expense represents an industry ratio that
     provides an investor with information as to our ability to meet our
     financing costs.

(3)  For purposes of calculating the ratio of earnings to fixed charges: (a)
     "fixed charges" represent interest expense (including amounts capitalized),
     amortization of debt costs and the portions of rental expense representing
     the interest factor; and (b) "earnings" represent the aggregate of income
     from continuing operations before income taxes, interest expense,
     amortization of debt issuance costs and the portion of rental expense
     representing the interest factor.

(4)  "Barrel miles" is a measurement of how fully a pipeline is used over its
     length and is calculated by multiplying the amount of each individual
     delivery (measured in barrels) by the distance it is shipped (measured in
     miles) and then adding the results so obtained for all deliveries.

(5)  "Deliveries" means the amount of liquid hydrocarbons delivered by a
     pipeline to certain points along the system and is quantified using a
     barrel as a unit of measure. "Barrels per day" delivery data is a
     measurement of average deliveries for the indicated period and is computed
     by dividing the number of barrels delivered for the period by the number of
     days in the period.


                                      S-9
<PAGE>   10
                                  RISK FACTORS

     You should carefully consider the following factors in evaluating an
investment in the notes:

     o   The Lakehead System and our financial performance depend upon adequate
         supplies of and demand for western Canadian crude oil. In 1999 and the
         nine months of 2000, our crude oil deliveries declined compared with
         1998. This decline resulted primarily from decreased crude oil
         production in western Canada, which in turn resulted primarily from
         reduced spending levels for exploration and development activities in
         western Canada. These reduced spending levels resulted from low oil
         prices in 1998 and the first part of 1999. Our ability to increase
         deliveries and to expand the Lakehead System in the future also depends
         upon increased supplies of western Canadian crude oil.

     o   The Lakehead System tariff rates are regulated by the FERC. Uncertainty
         surrounds the applicable regulatory standards for establishing tariff
         rates for liquids pipelines. In October 1996, the FERC approved a
         Settlement Agreement between us, the Canadian Association of Petroleum
         Producers and the Alberta Department of Energy on all then outstanding
         contested tariff rates. The Settlement Agreement provided that the
         agreed underlying tariff rates will be subject to indexing as
         prescribed by FERC regulation and that CAPP and ADOE will not challenge
         any rates within the indexed ceiling for a period of five years
         expiring October 2001. In addition to this base indexing methodology,
         our tariff rates include a cost-of-service surcharge to recover the
         cost of, and to provide a return on, our investment in SEP II and a
         fixed amount surcharge relating to the Terrace project. If our tariff
         rates were successfully challenged in the future, we could be adversely
         affected.

     o   Our secured indebtedness will be effectively senior to the notes to the
         extent of the collateral securing that indebtedness. While the
         agreements governing our first mortgage notes and our revolving credit
         facility contain covenants that restrict our ability to incur
         additional indebtedness, the indenture governing the notes does not so
         limit us. As of September 30, 2000, as adjusted to give effect to this
         offering, we would have had $801 million of total indebtedness. Of this
         indebtedness, a total of $501.2 million would have been outstanding
         under our first mortgage notes and revolving credit facility and, to
         the extent of the collateral securing that indebtedness, would have
         been senior to the notes.

     Please read "Risk Factors" beginning on page 4 of the accompanying
prospectus for a more detailed discussion of these and other factors that you
should consider before purchasing the notes.


                                      S-10
<PAGE>   11
                                 USE OF PROCEEDS


     We intend to use the net proceeds from this offering, estimated to be $98.8
million, to repay indebtedness under our revolving credit facility, which will
remain available for future borrowing. Pending the repayment of indebtedness
under the revolving credit facility, we may invest a portion of the proceeds in
short-term investment grade securities. We may reborrow funds under the
revolving credit facility as needed to fund capital expenditures and for working
capital.

     As of September 30, 2000, $290 million of indebtedness was outstanding
under the revolving credit facility at a weighted average interest rate of 7.39%
per annum, and $60 million was available for future borrowing. We incurred
substantially all of the indebtedness outstanding under the revolving credit
facility to fund capital expenditures, including capital expenditures related to
SEP II and Terrace, and working capital requirements. The revolving credit
facility has a five-year term with an "evergreen" provision that automatically
extends the maturity date each year by an additional year unless the banks give
notice of their intent not to extend. The revolving credit facility matures in
September 2005.


                                 CAPITALIZATION

     The following table shows our capitalization at September 30, 2000, and as
adjusted to give effect to this offering and the application of the estimated
net offering proceeds to repay indebtedness under the revolving credit facility.
Please read "Use of Proceeds." You should read this table in conjunction with
our financial statements and the notes to the financial statements incorporated
by reference in this prospectus supplement and the accompanying prospectus.

<TABLE>
<CAPTION>
                                                        AS OF SEPTEMBER 30, 2000
                                                        ------------------------
                                                          ACTUAL     AS ADJUSTED
                                                        ----------   -----------
                                                          (DOLLARS IN MILLIONS)
<S>                                                     <C>          <C>
               Long-term Debt:
                   First Mortgage Notes ...........     $    310.0   $    310.0
                   Revolving Credit Facility ......          290.0        191.2
                   7% Senior Notes due 2018 .......          100.0        100.0
                   7 1/8% Senior Notes due 2028....          100.0        100.0
                     7.9% Senior Notes due 2012....             --        100.0
                                                        ----------   ----------
                     Total Long-term Debt .........          800.0        801.2
               Partners' Capital ..................          554.1        554.1
                                                        ----------   ----------
                     Total Capitalization .........     $  1,354.1   $  1,355.3
                                                        ==========   ==========
</TABLE>


                                      S-11
<PAGE>   12
                                    BUSINESS

OVERVIEW

     We are the 98.9899% owned operating subsidiary partnership of Lakehead Pipe
Line Partners, L.P., a publicly traded Delaware limited partnership. We own and
operate a regulated crude oil and natural gas liquids pipeline business in the
United States. Lakehead Pipe Line Company, Inc., an indirect wholly owned
subsidiary of Enbridge Inc. of Canada, serves as our general partner. Enbridge
owns a 13.4% limited partner interest, in the form of 3,912,750 Class B Common
Units, and a 1% general partner interest in Lakehead Pipe Line Partners, L.P.,
as well as a 1% general partner interest in us. The remaining 84.7% limited
partner interest in Lakehead Pipe Line Partners, L.P. is represented by
24,990,000 publicly traded Class A Common Units.

     We and Enbridge transport crude oil and other liquid hydrocarbons for our
customers through the world's longest liquid petroleum pipeline system. We own
the United States portion of the System, and Enbridge owns the Canadian portion
of the System through a subsidiary, Enbridge Pipelines Inc. The System is the
primary transporter of crude oil from western Canada to the United States and is
the only pipeline system that transports crude oil from western Canada to the
Province of Ontario. The System serves all the major refining centers in the
Great Lakes region of the United States, as well as the Province of Ontario,
Canada and, through a connecting pipeline, the Patoka/Wood River pipeline hub
and refining center in southern Illinois.

     The System extends from Edmonton, Alberta, across the Canadian prairies to
the United States border near Neche, North Dakota. From Neche the System
continues on to Superior, Wisconsin, where it splits into two branches with one
branch traveling through the upper Great Lakes region and the other through the
lower Great Lakes region of the United States. Both branches reenter Canada near
Marysville, Michigan. From Marysville the System continues on to Toronto,
Ontario, with lateral lines to Nanticoke, Ontario and the Buffalo, New York
area. The System is approximately 3,100 miles long, including approximately
1,750 miles in the United States.

     Shipments tendered to the System originate in oil fields in the western
Canadian provinces of Alberta, Saskatchewan, Manitoba and British Columbia and
in the Northwest Territories of Canada. Shipments reach the System through
facilities owned and operated by third parties or affiliates of Enbridge
Pipelines. Deliveries from the System are currently made in the prairie
provinces of Canada and, through the Lakehead System, to the Great Lakes and
Midwest regions of the United States and to the Province of Ontario. These
deliveries are made principally to refineries either directly or through
connecting pipelines of other companies.

     All scheduling of shipments (including routes and storage) is handled by
Enbridge Pipelines in coordination with us. The Lakehead System includes 15
connections to pipelines and refineries at various locations in the United
States, including the refining areas in and around Chicago, Illinois,
Minneapolis-St. Paul, Minnesota, Detroit, Michigan, Toledo, Ohio, Buffalo, New
York, and Patoka/Wood River, Illinois. The Lakehead System has three main
terminals at Clearbrook, Minnesota, Superior, Wisconsin and Griffith, Indiana.
The terminals are used to gather crude oil prior to injection into the Lakehead
System and to provide tankage in order to allow for more flexible scheduling of
oil movements.

PROPERTIES

     The Lakehead System consists of approximately 3,300 miles of pipe with
diameters ranging from 12 inches to 48 inches, 63 main line pump station
locations with a total of approximately 667,000 installed horsepower and 58
crude oil storage tanks with an aggregate working capacity of approximately 10
million barrels. The Lakehead System requires at all times for operation
approximately 14 million barrels of oil in the pipeline, all of which is owned
by the shippers. The Lakehead System regularly transports up to 45 different
types of liquid hydrocarbons including light, medium and heavy crude oil
(including bitumen), condensate, synthetic crudes and natural gas liquids.


                                      S-12
<PAGE>   13
     The Lakehead System is comprised of a number of separate segments as
follows:

     o    Canadian border to Clearbrook segment including portions of four
          pipelines consisting of 18-, 20-, 26-, and 34-inch diameter pipe, and
          a fifth line consisting of 36- and 48- inch diameter pipe, with a
          total combined annual capacity of 1,727,000 barrels per day. This
          segment includes approximately 40 miles of 48-inch pipeline looping
          that increases the capacity of this segment.

     o    Clearbrook to Superior segment including portions of three pipelines
          consisting of 18-, 26-, and 34-inch diameter pipe, respectively, with
          a total annual capacity of 1,464,000 barrels per day. This segment
          also includes approximately 80 miles of 48-inch pipeline looping.

     o    Superior to Marysville segment consisting of 30-inch diameter pipe
          with an annual capacity of 509,000 barrels per day.

     o    Superior to Chicago area segment including two pipelines of 24- and
          34-inch diameter pipe with a total annual capacity of 889,000 barrels
          per day.

     o    Chicago area to Marysville segment that is a 30-inch diameter pipe
          with an annual capacity of 333,000 barrels per day.

     o    Canadian border to Buffalo segment consisting of 12- and 20- inch
          diameter pipe with an annual capacity of 74,000 barrels per day.


     The estimated annual capacities noted above take into account receipt and
delivery patterns and ongoing pipeline maintenance, and reflect achievable
pipeline capacity over long periods of time. Lakehead System capacities shown
above reflect the additional capacity provided by Phase I of the Terrace
Expansion Program, which was completed during 1999.

SUPPLY AND DEMAND FOR WESTERN CANADIAN CRUDE OIL

Supply

     Substantially all of the shipments delivered through the Lakehead System
originate in oil fields in western Canada. The Lakehead System also receives

          o    United States and Canadian production at Clearbrook through a
               connection with a pipeline owned by a subsidiary of Enbridge,

          o    United States production at Lewiston, Michigan, and

          o    both United States and offshore production in the Chicago area.

Changes in supply from western Canada directly affect movements through
Enbridge's portion of the System and the supply available for transportation
through the Lakehead System.

     Enbridge Pipelines applied to the National Energy Board in December 1997 to
construct its Terrace Phase I facilities in Canada. These facilities complement
our Terrace Phase I facilities. As part of that application, Enbridge Pipelines
submitted a forecast of supply of western Canadian crude oil and a projection of
the markets in which it could reasonably be expected to be consumed. Forecasts
by their nature are based upon numerous assumptions, including estimates
provided by the industry, many of which are beyond the control of Enbridge
Pipelines or us. The forecast submitted to the National Energy Board in 1997
showed the supply of western Canadian crude oil in the year 2003 at over
2,550,000 barrels per day, approximately 500,000 barrels per day above 1997
average daily production of western Canadian crude oil. The supply of western
Canadian crude oil was expected to remain at over 2,500,000 barrels per day
through 2010. While acknowledging the uncertainty associated with forecasts of
the


                                      S-13
<PAGE>   14
supply of crude oil and other commodities shipped on the Enbridge Pipelines'
portion of the System, the National Energy Board accepted as reasonable the
forecasts of the supply of crude oil and other commodities submitted by Enbridge
Pipelines and recommended that a certificate for construction be issued. The
forecast quantities of crude oil in the 1997 forecast were made subject to
numerous uncertainties and assumptions, including a crude oil price of $17.50
per barrel in 1998 rising to $22.25 in 2010. Terrace Phase I was completed in
1999.

     The low crude oil prices experienced during 1998 and early 1999 caused a
decline in western Canadian producer's expenditures for exploration and
development, which in turn adversely affected the crude oil supply available in
western Canada. As a result, Enbridge Pipelines has updated its forecast of
western Canadian crude oil supply and the markets served by the System. This
long-term outlook involves updated supply projections from the oil sands
projects currently operating, being expanded or proposed in western Canada. We
believe that production from these projects is less sensitive to the short-term
fluctuations in the price of crude oil due to the magnitude of committed capital
expenditures involved.

     The updated Enbridge Pipelines forecast projects that the supply of western
Canadian crude oil will be approximately 2,230,000 barrels per day in 2001 and
approximately 2,285,000 barrels per day in 2002. These projected volumes are
lower than the original Terrace western Canada forecast by 90,000 barrels per
day for 2001 and 180,000 barrels per day for 2002. The updated Enbridge
Pipelines forecast projects the supply of crude oil to rise to approximately
2,500,000 barrels per day in 2003 and to approximately 2,750,000 barrels per day
by 2010. The forecast quantity of crude oil was made subject to numerous
uncertainties and assumptions, including a crude oil price of $21.95 per barrel
in 2000 rising to $27.00 in 2010. On November 10, 2000, the benchmark West Texas
Intermediate crude oil price closed at $34.02 per barrel, up from the 1998 low
of $10.73 per barrel. We currently expect West Texas Intermediate prices to
average above $29.00 per barrel in 2000.

     While the projected supply of crude oil for 2001 and 2002 is somewhat lower
than the original Terrace forecast, the updated Enbridge Pipelines forecast
supports the need for additional pipeline facilities beyond the Terrace Phase I
facilities. Phase II includes construction of facilities to increase capacity on
the Canadian portion of the System. While Phase II does not involve construction
on the Lakehead System, we expect to benefit directly from the approximately
40,000 barrel per day increase in capacity as additional volumes from the
Alberta Oil Sands come on stream. Subject to final National Energy Board
approval, Phase II is expected to be placed in service during the first half of
2002.

     The National Energy Board released a report titled "Canadian Energy Supply
and Demand to 2025" on June 30, 1999, in which it provided several long-term
scenarios of supply and demand for western Canadian crude oil. We believe the
most realistic scenario is a case that is based on a West Texas Intermediate
price of $18.00 per barrel in constant 1997 dollars and assumes low cost energy
supply and current trends in demand. This scenario resulted in total western
Canadian production that was lower than Enbridge Pipelines' most recent forecast
by approximately 40,000 barrels per day in 2005 and approximately 150,000
barrels per day in 2010. The variance in production estimates between the
National Energy Board study and the Enbridge Pipelines forecast ranges between
approximately 1% and 5% in all periods.

     We believe that the outlook for increased crude oil production in western
Canada continues to be positive, as evidenced by the Enbridge Pipelines
forecast, the National Energy Board study and CAPP's recent approval of Terrace
Phase II. The timing of growth in the supply of western Canadian crude oil,
however, will depend upon the level of crude oil prices and drilling activity
and the timing of completion of projects to produce heavy and synthetic oil from
the Alberta Oil Sands.

Demand

     For strategic planning purposes, the U.S. government segregates the United
States into five Petroleum Administration for Defense Districts, referred to as
PADDs. The oil industry utilizes these districts in reporting statistics
regarding oil supply and demand. The Lakehead System services the northern tier
of PADD 2. Modestly increasing crude oil demand and declining inland U.S.
domestic production are contributing to an increasing need for importing crude
oil into the PADD 2 market. We believe that PADD 2 will continue to provide an
excellent


                                      S-14
<PAGE>   15
market for western Canadian shippers because returns to crude oil producers are
expected to remain attractive. We believe that PADD 2 will remain the most
attractive market for western Canadian supply since it is currently the largest
North American processor of western Canadian heavy crude oil and has strong
potential for converting refining capacity from light to heavy crude.

     Although western Canadian producers experience competition from Venezuelan
and Mexican heavy crude oil in PADD 2, we expect western Canadian heavy crude
oil to remain the dominant supply source for the region. We believe that Latin
American heavy crude oil will continue to provide the swing supply to the PADD 2
region. In the short term, we expect Latin American deliveries to PADD 2 to
decrease as the supply of western Canadian crude oil continues to recover from
the negative impact of the 1998/99 price decline. Over the long term, we expect
producers of Latin American heavy crude oil to concentrate on the PADD 3 and
PADD 5 markets, where they receive a higher return compared with PADD 2.

     Based on the most recent forecast completed by Enbridge Pipelines, exports
from western Canada to the United States are projected to increase to
approximately 1,828,000 barrels per day in 2005 and remain at that level or
above through 2010. This is approximately 714,000 barrels per day higher than
1999 exports. Of the exports to the United States, it is expected that PADD 2
would receive approximately 1,456,000 barrels per day in 2005, approximately
612,000 barrels per day higher than 1999. Beyond 2005, the Enbridge Pipelines
forecast projects exports to PADD 2 to rise to approximately 1,466,000 barrels
per day in 2007 and approximately 1,492,000 barrels per day by 2010.

     Crude oil refineries in Ontario generally process light sweet and light
sour crude oil, and the supply of conventional light sweet and light sour crude
oil from western Canada is expected to decline. Ontario refiners cannot process
significantly greater amounts of western Canadian heavy crude oil without
substantial reconfiguration of their refineries. To the extent Ontario refiners
have found it difficult to obtain light crude oil supply from western Canada at
an economic price, refiners have been recently accessing foreign light crude
volumes through the reversed facilities of Enbridge Pipelines Line 9 from
Montreal, Quebec to Sarnia, Ontario. This has had an impact on the volumes
moving through the Lakehead System pipeline connections in the Chicago area.
Light crude oil movements originating in the Chicago area for delivery to
Ontario declined following the reversal of Enbridge's Line 9 in 1999, averaging
approximately 63,500 barrels per day for 1999, and approximately 10,000 barrels
per day in the third quarter of 2000. Line 9 has an annual capacity of
approximately 240,000 barrels per day and, for the first nine months of 2000,
operated at approximately 203,000 barrels per day. The ongoing utilization level
of Line 9 will be dependent upon global crude oil market dynamics.


                                      S-15
<PAGE>   16
           DESCRIPTION OF EXISTING INDEBTEDNESS AND CREDIT FACILITIES


     We had long-term debt of $800 million as of September 30, 2000, consisting
of $310 million of our first mortgage notes, $290 million outstanding under our
revolving credit facility, $100 million of our 7% senior notes due 2018 and $100
million of our 7 1/8% senior notes due 2028. The first mortgage notes and our
indebtedness under the revolving credit facility are secured by a mortgage on
substantially all of our property, plant and equipment and are recourse to the
general partner. The senior notes are unsecured, rank equally in right of
payment with all our existing and future senior unsecured indebtedness and are
senior in right of payment to any future subordinated indebtedness.

     The first mortgage notes are due and payable in ten equal annual
installments of $31 million each beginning in 2002, with the final such payment
being due in 2011. We can optionally prepay the first mortgage notes, in whole
or in part, at a premium. The first mortgage notes bear interest of 9.15% per
annum, payable semi-annually in arrears.

     The revolving credit facility provides for a $350 million revolving line of
credit. Borrowings under the revolving credit facility bear interest, at our
option, at one of the following rates:

     o   the prime rate;

     o   a certificate of deposit based rate; or

     o   a LIBOR based rate

plus, in each of the last two options, a margin that varies from 0.125% up to
0.75% per annum, depending on our cash flow/interest coverage ratio.

     The revolving credit facility has a five-year term with an "evergreen"
provision that automatically extends the maturity date each year by an
additional year unless the banks give us notice of their intent not to extend.
The revolving credit facility matures in September 2005.

     The $200 million of senior notes were issued in October 1998 under a $400
million debt shelf registration statement. The senior notes were issued in two
tranches of $100 million each. The first tranche of senior notes is due in 2018
and bears interest at a rate of 7% per annum. The second tranche of senior notes
is due in 2028 and bears interest at a rate of 7.125% per annum. Interest is
payable semi-annually in arrears.

     The agreements relating to the first mortgage notes and the revolving
credit facility contain substantially similar covenants requiring us to offer to
prepay the first mortgage notes and the indebtedness outstanding under the
revolving credit facility with the proceeds of asset sales. The agreements also
restrict, among other things,

     o   our ability to incur additional indebtedness, and

     o   some of our operations, including giving the lenders the ability to
         require the establishment of reserves.

     The indenture for the $200 million of senior notes will also govern the
notes to be issued under this prospectus supplement and the accompanying
prospectus. The indenture limits our ability to create liens on our assets and
to engage in sale-leaseback transactions. Please read "Description of the Debt
Securities -- Provisions Applicable Solely to Senior Debt Securities" in the
accompanying prospectus.


                                      S-16
<PAGE>   17
                            DESCRIPTION OF THE NOTES


     The following description of the particular terms of the notes supplements
the general description of the Debt Securities included in the accompanying
prospectus. You should review this description together with the description of
the Debt Securities included in the prospectus. To the extent this description
is inconsistent with the description in the prospectus, this description will
control and replace the inconsistent prospectus description.

     We will issue the notes under an indenture, dated September 15, 1998 (as
amended and supplemented from time to time, including a supplement setting forth
the terms of the notes), between us and The Chase Manhattan Bank, as trustee.
The terms of the notes include those stated in the indenture and those made part
of the indenture by reference to the Trust Indenture Act. We have summarized
some of the material provisions of the notes and the indenture below. The
summary supplements the description of the indenture contained in the
accompanying prospectus, and we encourage you to read that description for
additional material provisions that may be important to you. We also urge you to
read the indenture because it, and not this description, defines your rights as
a holder of notes. You may request copies of the indenture from us as set forth
under "Available Information" in the accompanying prospectus. Capitalized terms
defined in the accompanying prospectus and the indenture have the same meanings
when used in this prospectus supplement.

BRIEF DESCRIPTION OF THE NOTES

     The notes:

          o    will be our senior unsecured indebtedness;

          o    will rank equally in right of payment with all of our existing
               and future unsecured and unsubordinated indebtedness;

          o    will be senior in right of payment to any future subordinated
               indebtedness; and

          o    will be effectively junior to all of our existing secured
               indebtedness, to the extent of the collateral securing that
               indebtedness. As of September 30, 2000, we had total indebtedness
               of approximately $600 million under our first mortgage notes and
               revolving credit facility.

PRINCIPAL, MATURITY AND INTEREST

     We will issue the notes in the aggregate principal amount of $100 million.
The notes will mature on November 21, 2012. We will issue the notes in
denominations of $1,000 and whole multiples of $1,000.

     Interest on the notes will accrue at the annual rate of 7.9% and will be
payable semi-annually in arrears on May 21 and November 21 of each year,
commencing May 21, 2001. We will make each interest payment to the holders of
record on the immediately preceding May 6 and November 6.

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


                                      S-17
<PAGE>   18
METHODS OF RECEIVING PAYMENTS ON THE NOTES

     When the notes are not held in book-entry form, if you hold of record at
least $1 million aggregate principal amount of the notes, you may request to
have any payment of interest on your notes be made by wire transfer. We will
make all other payments on the notes at the office or agency of the paying agent
and registrar within the City and State of New York unless we elect to make
interest payments by check mailed to you at your addresses set forth in the
register of holders.

PAYING AGENT AND REGISTRAR FOR THE NOTES

     The trustee will initially act as paying agent and registrar. We may change
the paying agent or registrar without prior notice to you, and we or any of our
subsidiaries may act as paying agent or registrar.

TRANSFER AND EXCHANGE

     A registered holder may transfer or exchange notes in accordance with the
indenture. The registrar and the trustee may require a holder to furnish
appropriate endorsements and transfer documents in connection with the transfer
of notes. Holders will be required to pay all taxes due on transfer. We are not
required to transfer or exchange any note selected for redemption. Also, we are
not required to transfer or exchange any note for a period of 15 days before a
selection of notes to be redeemed.

RATINGS

     The notes have been assigned ratings of A- by Standard & Poor's and A3 by
Moody's. These ratings have been obtained with the understanding that Standard &
Poor's and Moody's will continue to monitor the ratings and will make future
adjustments to the extent warranted. A rating reflects only the view of Standard
& Poor's or Moody's, and is not a recommendation to buy, sell or hold the notes.
We cannot assure you that any rating will be retained for any given period of
time or that it will not be revised downward or withdrawn entirely.

OPTIONAL REDEMPTION

     The notes will be redeemable as a whole or in part, at our option at any
time, at a redemption price equal to the greater of

     o   100% of the principal amount of the notes and

     o   the sum of the present values of the remaining scheduled payments of
         principal and interest on the notes, exclusive of interest accrued to
         the date of redemption, discounted to the redemption date on a
         semiannual basis, assuming a 360-day year consisting of twelve 30-day
         months, at the Treasury Rate plus 37.5 basis points,

plus in each case accrued interest to the date of redemption.

     "Treasury Rate" means, for any redemption date, the rate per annum equal to
the semiannual equivalent yield to maturity or interpolated (on a day count
basis) of the Comparable Treasury Issue, assuming a price for the Comparable
Treasury Issue (expressed as a percentage of its principal amount) equal to the
Comparable Treasury Price for that redemption date.

     "Comparable Treasury Issue" means the United States Treasury security or
securities selected by an Independent Investment Banker as having an actual or
interpolated maturity comparable to the remaining term of the notes to be
redeemed that would be utilized, at the time of selection and in accordance with
customary financial practice, in pricing new issues of corporate debt securities
of a comparable maturity to the remaining term of the notes.


                                      S-18
<PAGE>   19
     "Comparable Treasury Price" means, for any redemption date, (A) the average
of the Reference Treasury Dealer Quotations for such redemption date, after
excluding the highest and lowest such Reference Treasury Dealer Quotations, or
(B) if the trustee obtains fewer than four such Reference Treasury Dealer
Quotations, the average of all such quotations.

     "Independent Investment Banker" means one of the Reference Treasury Dealers
appointed by the trustee after consultation with us.

     "Reference Treasury Dealer" means each of Merrill Lynch, Pierce, Fenner &
Smith Incorporated, plus four other dealers selected by the trustee, or their
affiliates that are primary U.S. government securities dealers, and their
respective successors.

     "Reference Treasury Dealer Quotations" means, for each Reference Treasury
Dealer and any redemption date, the average, as determined by the trustee, of
the bid and asked prices for the Comparable Treasury Issue (expressed in each
case as a percentage of its principal amount) quoted in writing to the trustee
by such Reference Treasury Dealer at 3:30 p.m., New York time, on the third
business day preceding such redemption date.

     We will mail notice of any redemption at least 30 days but not more than 60
days before the redemption date to each holder of notes to be redeemed.

     Unless we default in payment of the redemption price, on and after the
redemption date interest will cease to accrue on the notes or portions thereof
called for redemption.

BOOK ENTRY, DELIVERY AND FORM

     The notes will be issued in the form of one or more global notes. The
global notes will be deposited on the original date of issuance of the notes
with, or on behalf of The Depository Trust Company ("DTC") and registered in the
name of Cede & Co., as nominee of DTC. Beneficial interests in the global notes
will be represented through financial institutions acting on their behalf as
direct or indirect participants in DTC.

     Except as set forth below, the global notes may be transferred, in whole
and not in part, only to another nominee of DTC or to a successor of DTC or its
nominee. Beneficial interests in the global notes may not be exchanged for notes
in certificated form except in limited circumstances described below. Please
read "--Exchange of Global Notes for Certificated Notes." Except in the limited
circumstances described below, owners of beneficial interests in the global
notes will not be entitled to receive physical delivery of notes in certificated
form.

DEPOSITORY PROCEDURES

     The following description of the operations and procedures of DTC is
provided solely as a matter of convenience. These operations and procedures are
solely within the control of DTC and are subject to changes by DTC. We take no
responsibility for these operations and procedures and urge investors to contact
DTC or their participants directly to discuss these matters.

     DTC has advised us that DTC is a limited-purpose trust company created to
hold securities for its participating organizations (collectively, the
"Participants") and to facilitate the clearance and settlement of transactions
in those securities between Participants through electronic book-entry changes
in accounts of its Participants. The Participants include securities brokers and
dealers (including the underwriters), banks, trust companies, clearing
corporations and other organizations. Access to DTC's system is also available
to other entities such as banks, brokers, dealers and trust companies that clear
through or maintain a custodial relationship with a Participant, either directly
or indirectly (collectively, the "Indirect Participants"). Persons who are not
Participants may beneficially own securities held by or on behalf of DTC only
through the Participant.


                                      S-19
<PAGE>   20
     DTC has also advised us that, pursuant to procedures established by it:

     (1) upon deposit of the global notes, DTC will credit the accounts of
         Participants designated by the underwriters with portions of the
         principal amounts of the global notes; and

     (2) ownership of these interests in the global notes will be shown on, and
         the transfer of ownership of the notes will be effected only through,
         records maintained by DTC (with respect to Participants) or by the
         Participants and the Indirect Participants (with respect to other
         owners of beneficial interests in the global notes).

     Transfers between Participants in DTC will be effected in the ordinary way
in accordance with DTC rules. The laws of some states require that persons take
physical delivery of securities in definitive form. Consequently, the ability to
transfer beneficial interests in a global note to these persons may be limited.
Because DTC can only act on behalf of Participants, who in turn act on behalf of
Indirect Participants and certain banks, the ability of a person having a
beneficial interest in a global note to pledge the beneficial interest to
persons that do not participate in the DTC system, or otherwise take actions in
respect of the beneficial interest, may be affected by the lack of a physical
certificate of the beneficial interest.

     So long as DTC, or its nominee, is the registered owner or holder of a
global note of a series, DTC or its nominee will be considered the sole owner or
holder of the notes represented by the global note for all purposes under the
indenture and the notes. Except as provided below, beneficial owners of an
interest in a global note:

     o    will not be entitled to have notes registered in their names;

     o    will not receive or be entitled to receive physical delivery of notes
          in definitive form; and

     o    will not be considered the owners or holders of the notes under the
          indenture for any purpose, including with respect to the giving of any
          directions, instructions or approvals to the trustee thereunder.

     In addition, no beneficial owner of an interest in a global note will be
able to transfer that interest except in accordance with the applicable
procedures of DTC.

     Payments on global notes will be made to DTC or its nominee, as the
registered owner or holder of the global notes. Under the terms of the
indenture, we and the trustee will treat the persons in whose names the notes,
including the global notes, are registered as the owners of the notes for the
purpose of receiving payments and for all other purposes. Consequently, neither
we, nor the trustee nor any paying agent will have any responsibility or
liability for:

     o    any aspect of DTC's records or any Participant's or Indirect
          Participant's records relating to or payments made on account of
          beneficial ownership interest in the global notes or for maintaining,
          supervising or reviewing any of DTC's records or any Participant's or
          Indirect Participant's records relating to the beneficial ownership
          interests in global notes; or

     o    any other matter relating to the actions and practices of DTC or any
          of its Participants or Indirect Participants.

     DTC has advised us that its current practice, upon receipt of any payment
in respect of securities such as the notes, including principal and interest, is
to credit the accounts of the relevant Participants with payment on the payment
date unless DTC has reason to believe it will not receive payment on the payment
date. Each relevant Participant is credited with an amount proportionate to its
beneficial ownership of an interest in the principal amount of the relevant
security as shown on the records of DTC. Payments by the Participants and the
Indirect Participants to the beneficial owners of the notes will be governed by
standing instructions and customary practices and will be the responsibility of
the Participants or the Indirect Participants and will not be the responsibility
of DTC, the trustee


                                      S-20
<PAGE>   21
or us. Neither we nor the trustee will be liable for any delay by DTC or any of
its Participants in identifying the beneficial owners of the notes, and we and
the trustee may conclusively rely on and will be protected in relying on
instructions from DTC or its nominee for all purposes.

     DTC has advised us that it will take any action permitted to be taken by a
holder of notes only at the direction of one or more Participants to whose
account DTC has credited the interests in the global notes and only in respect
of the portion of the aggregate principal amount of the notes as to which the
Participant or Participants has or have given such direction. However, if there
is an Event of Default under the notes, DTC reserves the right to exchange the
global notes for notes in certificated form, and to distribute such notes to its
Participants.

     DTC has advised us as follows: DTC is

     o    a limited-purpose trust company organized under the New York Banking
          Law;

     o    a "banking organization" within the meaning of the New York Banking
          Law;

     o    a member of the Federal Reserve System;

     o    a "clearing corporation" within the meaning of the New York Uniform
          Commercial Code; and

     o    a "clearing agency" registered pursuant to the provisions of Section
          17A of the Securities Exchange Act of 1934.

     Although DTC is expected to follow the foregoing procedures to facilitate
transfers of interests in the global notes among Participants of DTC, it is
under no obligation to perform or continue to perform such procedures, and such
procedures may be discontinued at any time. Neither we nor the trustee will have
any responsibility for the performance by DTC or the Participants or Indirect
Participants of their respective obligations under the rules and procedures
governing their operations.

EXCHANGE OF GLOBAL NOTES FOR CERTIFICATED NOTES

     A global note is exchangeable for definitive notes in registered
certificated form ("Certificated Notes") if:

     (1)  DTC (a) notifies us that it is unwilling or unable to continue as
          depositary for the global notes and we fail to appoint a successor
          depository or (b) has ceased to be a clearing agency registered under
          the Securities Exchange Act of 1934 and we fail to appoint a successor
          depository;

     (2)  we, at our option, notify the trustee in writing that we elect to
          cause the issuance of the Certificated Notes; or

     (3)  a Default or Event of Default on the notes has occurred and is
          continuing.

     In addition, beneficial interests in a global note may be exchange for
Certificated Notes upon prior written notice given to the trustee by or on
behalf of DTC in accordance with the indenture. In all cases, Certificated Notes
delivered in exchange for any global note or beneficial interests in global
notes will be registered in the names, and issued in any approved denominations,
requested by or on behalf of the depository (in accordance with its customary
procedures) and will bear the applicable restrictive legend, unless that legend
is not required by applicable law.


                                      S-21
<PAGE>   22
                                  UNDERWRITING


     We intend to offer the notes through the underwriters. Merrill Lynch,
Pierce, Fenner & Smith Incorporated is acting as representative of the
underwriters named below. Subject to the terms and conditions contained in an
underwriting agreement between us and the underwriters, we have agreed to sell
to the underwriters and the underwriters severally have agreed to purchase from
us, the principal amount of the notes listed opposite their names below.

<TABLE>
<CAPTION>
                                                                     PRINCIPAL
                     UNDERWRITER                                      AMOUNT
                     -----------                                     ---------
<S>                                                                <C>
Merrill Lynch, Pierce, Fenner & Smith
        Incorporated .......................................       $ 52,000,000
ABN AMRO Incorporated ......................................         16,000,000
Banc of America Securities LLC .............................         16,000,000
Chase Securities Inc. ......................................         16,000,000
                                                                   ------------
                  Total ....................................       $100,000,000
                                                                   ============
</TABLE>


     The underwriters have agreed to purchase all of the notes sold under the
underwriting agreement if any of these notes are purchased. If an underwriter
defaults, the underwriting agreement provides that the purchase commitments of
the nondefaulting underwriters may be increased or the underwriting agreement
may be terminated.

     We have agreed to indemnify the underwriters against certain liabilities,
including liabilities under the Securities Act, or to contribute to payments the
underwriters may be required to make in respect of those liabilities.

     The underwriters are offering the notes, subject to prior sale, when, as
and if issued to and accepted by them, subject to approval of legal matters by
their counsel, including the validity of the notes, and other conditions
contained in the underwriting agreement, such as the receipt by the underwriters
of officer's certificates and legal opinions. The underwriters reserve the right
to withdraw, cancel or modify offers to the public and to reject orders in whole
or in part.

COMMISSIONS AND DISCOUNTS

     The underwriters have advised us that they propose initially to offer the
notes to the public at the public offering price on the cover page of this
prospectus, and to dealers at that price less a concession not in excess of .4%
of the principal amount of the notes. The underwriters may allow, and the
dealers may reallow, a discount not in excess of .25% of the principal amount of
the notes to other dealers. After the initial public offering, the public
offering price, concession and discount may be changed.

     The expenses of the offering, not including the underwriting discount, are
estimated to be $375,000 and are payable by us.

NEW ISSUE OF NOTES

     The notes are a new issue of securities with no established trading market.
We do not intend to apply for listing of the notes on any national securities
exchange or for quotation of the notes on any automated dealer quotation system.
We have been advised by the underwriters that they presently intend to make a
market in the notes after completion of the offering. However, they are under no
obligation to do so and may discontinue any market-making activities at any time
without any notice. We cannot assure the liquidity of the trading market for the
notes or that an active public market for the notes will develop. If an active
public trading market for the notes does not develop, the market price and
liquidity of the notes may be adversely affected.


                                      S-22
<PAGE>   23
PRICE STABILIZATION AND SHORT POSITIONS

     In connection with the offering, the underwriters are permitted to engage
in transactions that stabilize the market price of the notes. Such transactions
consist of bids or purchases to peg, fix or maintain the price of the notes. If
the underwriters create a short position in the notes in connection with the
offering, i.e., if they sell more notes than are shown on the cover page of the
prospectus, the underwriters may reduce that short position by purchasing notes
in the open market. Purchases of a security to stabilize the price or to reduce
a short position could cause the price of the security to be higher than it
might be in the absence of such purchases.

     Neither we nor any of the underwriters makes any representation or
prediction as to the direction or magnitude of any effect that the transactions
described above may have on the price of the notes. In addition, neither we nor
any of the underwriters makes any representation that the underwriters will
engage in these transactions or that these transactions, once commenced, will
not be discontinued without notice.

OTHER RELATIONSHIPS

     In the ordinary course of their businesses, some of the underwriters and
their affiliates have engaged, and in the future may engage, in investment
banking or commercial banking transactions with us or our affiliated companies.
An affiliate of ABN AMRO Incorporated is a lender under our revolving credit
facility. We intend to use the proceeds from this offering to repay indebtedness
outstanding under our revolving credit facility, resulting in payments to each
lender of more than 10% of the net proceeds of this offering. Please read "Use
of Proceeds." Because more than ten percent of the net proceeds of this offering
will be paid to members or affiliates of members of the National Association of
Securities Dealers, Inc. participating in the offering, this offering will be
conducted in accordance with NASD Conduct Rule 2710(c)(8). In addition, The
Chase Manhattan Bank, an affiliate of Chase Securities Inc., is the trustee
under the indenture under which the notes are being issued. Affiliates of Chase
Securities Inc. and affiliates of Banc of America Securities LLC have engaged in
various general financing and banking transactions with Enbridge and its
affiliates.

                                  LEGAL MATTERS

     Fulbright & Jaworski L.L.P., Houston, Texas, will issue opinions about
various legal matters in connection with the offering on our behalf. Baker Botts
L.L.P., Houston, Texas, the underwriters' counsel, will also issue opinions
about various legal matters in connection with the offering on behalf of the
underwriters.


                                      S-23
<PAGE>   24

PROSPECTUS

                LAKEHEAD PIPE LINE COMPANY, LIMITED PARTNERSHIP

                             SENIOR DEBT SECURITIES
                          SUBORDINATED DEBT SECURITIES
                            ------------------------

     Lakehead Pipe Line Company, Limited Partnership (the "Company") may offer
and sell from time to time in one or more series its unsecured debt securities
which may be senior (the "Senior Debt Securities") or subordinated (the
"Subordinated Debt Securities"). The Company is 98.9899% owned by Lakehead Pipe
Line Partners, L.P. ("Lakehead" and, together with the Company, the
"Partnership").

     The Senior Debt Securities and the Subordinated Debt Securities are
collectively hereinafter referred to as the "Debt Securities." The Debt
Securities will be limited to an aggregate initial public offering price not to
exceed $400 million, or the equivalent thereof in one or more foreign currencies
or currency units, including composite currencies. The Debt Securities may be
offered in separate series, in amounts, at prices and on terms to be determined
in light of market conditions at the time of sale and set forth in a related
Prospectus Supplement.

     Certain specific terms of the particular Debt Securities for which this
Prospectus is being delivered will be set forth in a related Prospectus
Supplement, including, where applicable, the specific designation and priority,
aggregate principal amount, authorized denominations, maturities, interest rate
or rates or the method of determining the same, the date or dates on which
interest, if any, shall be payable, the place or places where principal of and
premium, if any, and interest, if any, on such Debt Securities of the series
will be payable, any terms for optional or mandatory redemption or any sinking
fund or analogous provisions, currency or currencies, or currency unit or
currency units of denomination and payment if other than U.S. dollars, the
initial public offering price, the net proceeds to the Company, terms relating
to temporary or permanent global securities, provisions regarding registration
of transfer or exchange and other special terms.

     The Debt Securities may be offered and sold to or through underwriters,
dealers, or agents as designated from time to time, or through a combination of
such methods, and also may be offered and sold directly to one or more other
purchasers. See "Plan of Distribution." The names of, and the principal amounts
of Debt Securities to be purchased by or through, underwriters, dealers or
agents, and the compensation of such underwriters, dealers or agents, including
any applicable fees, commissions, and discounts, will be set forth in the
related Prospectus Supplement. The net proceeds to the Company from the offer
and sale of each series of Debt Securities will also be set forth in the related
Prospectus Supplement.

     No Debt Securities may be sold without delivery of a Prospectus Supplement
describing such series or issue of Debt Securities and the method and terms of
offering thereof.

     SEE "RISK FACTORS" BEGINNING ON PAGE 4 FOR A DISCUSSION OF CERTAIN FACTORS
THAT PROSPECTIVE INVESTORS IN THE DEBT SECURITIES SHOULD CONSIDER.

                            ------------------------

  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.

                            ------------------------

               The date of this Prospectus is September 21, 1998.
<PAGE>   25

                             AVAILABLE INFORMATION

     Lakehead is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and, in accordance
therewith, files reports and other information with the Securities and Exchange
Commission (the "Commission"). Such reports and other information may be
inspected and copied at the public reference facilities maintained by the
Commission at Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549,
and at the following regional offices of the Commission: 7 World Trade Center,
Suite 1300, New York, New York 10048; and 500 West Madison Street, Suite 1400,
Chicago, Illinois 60661-2511. Copies of such material also may be obtained at
prescribed rates from the Public Reference Section of the Commission, Judiciary
Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549. Such material also may be
accessed electronically by means of the Commission's home page on the Internet
at http://www.sec.gov. Lakehead's Class A Common Units are listed for trading on
the New York Stock Exchange (the "NYSE") under the trading symbol "LHP", and
reports and other information concerning Lakehead may be inspected at the
offices of the NYSE, 20 Broad Street, New York, New York 10005. Information
relating to Lakehead may also be obtained electronically by means of Lakehead's
home page on the Internet at http://www.lakehead.com.

     This Prospectus does not contain all of the information set forth in the
Registration Statement, of which this Prospectus is a part, filed with the
Commission under the Securities Act of 1933, as amended (the "Securities Act").
Reference is made to such Registration Statement for further information with
respect to the Company and the Debt Securities offered hereby. Statements
contained herein concerning the provisions of documents are necessarily
summaries of such documents, and each statement is qualified in its entirety by
reference to the copy of the applicable document filed with the Commission.

                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

     The following documents heretofore filed with the Commission by Lakehead
pursuant to the Exchange Act (File No. 1-10934) are incorporated herein by
reference and shall be a part hereof:

          1. Lakehead's Annual Report on Form 10-K for the fiscal year ended
     December 31, 1997, as amended by Lakehead's Annual Report on Form 10-K/A
     for the fiscal year ended December 31, 1997 (the "Form 10-K");

          2. Lakehead's Quarterly Report on Form 10-Q for the quarterly period
     ended March 31, 1998;

          3. Lakehead's Quarterly Report on Form 10-Q for the quarterly period
     ended June 30, 1998, as amended by Lakehead's Quarterly Report on Form
     10-Q/A for the quarterly period ended June 30, 1998; and

          4. Lakehead's Current Report on Form 8-K dated July 21, 1998, as
     amended by Lakehead's Current Report on Form 8-K/A filed September 15,
     1998.

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

     Lakehead will provide without charge to each person, including any
beneficial owner of a Debt Security, to whom a copy of this Prospectus is
delivered, upon written or oral request of such person, a copy of any or all
documents incorporated by reference in this Prospectus (other than exhibits to
such documents unless such exhibits are specifically incorporated by reference
into such documents). Requests for such copies should be

                                        2
<PAGE>   26

directed to Lakehead Pipe Line Partners, L.P., Lake Superior Place, 21 West
Superior Street, Duluth, Minnesota 55802, Attention: R.R. Karlen, Investor
Relations, telephone (800) 525-3999 or (218) 725-0100.

     No separate financial information for the Company has been provided or
incorporated by reference in this Prospectus because all operations of the
Partnership are conducted by the Company, substantially all of the earnings and
cash flow of the Partnership are generated by the Company, and substantially all
of the assets and liabilities shown in the consolidated financial statements of
the Partnership are owned directly by the Company.

                       CERTAIN FORWARD-LOOKING STATEMENTS

     This Prospectus and the accompanying Prospectus Supplement (including the
documents incorporated by reference herein and therein) contain certain
forward-looking statements and information relating to the Partnership that are
based on the beliefs of the management of the General Partner as well as
assumptions made by and information currently available to the management of the
General Partner. When used in, or incorporated by reference into, this
Prospectus and the accompanying Prospectus Supplement, the words "anticipate,"
"expect," "project" and similar expressions are intended to identify
forward-looking statements. Such statements are subject to certain risks,
uncertainties and assumptions pertaining to operating performance, regulatory
parameters, economic conditions, etc. Should one or more of these risks or
uncertainties materialize, or should underlying assumptions prove incorrect,
actual results may vary significantly from those anticipated, expected or
projected. Except as required by applicable securities laws, the Company does
not intend to update these forward-looking statements and information. For
additional discussion of such risks, uncertainties and assumptions, see "Risk
Factors" in this Prospectus and "Items 1 & 2. Business and
Properties -- Business Risks" in the Form 10-K. All written and verbal
forward-looking statements attributable to the Company, or persons acting on its
behalf are expressly qualified in their entirety by such factors.

                                        3
<PAGE>   27

                                  RISK FACTORS

     Prospective investors should carefully consider the risk factors described
below, in addition to the other information set forth elsewhere or incorporated
by reference in this Prospectus and any accompanying Prospectus Supplement, in
connection with an investment in the Debt Securities offered hereby and thereby.

CONSIDERATIONS RELATING TO THE PARTNERSHIP'S BUSINESS

  Dependence Upon Western Canadian Crude Oil Supply and the IPL System

     The Lakehead System (as defined herein) is dependent upon the level of
supply of crude oil and other liquid hydrocarbons from western Canada.
Interprovincial Pipe Line Inc. ("IPL"), the parent company of Lakehead Pipe Line
Company, Inc., which is the general partner of Lakehead and the Company (the
"General Partner"), has advised the General Partner that in 1997, the IPL System
(as defined herein) transported approximately 65% of all crude oil produced in
western Canada, of which approximately 90% was transported by the Lakehead
System. If a decline in western Canadian crude oil production occurs, the
General Partner expects that throughput on the Lakehead System will also
decline.

     The Lakehead System is dependent upon the utilization of the IPL System by
producers of western Canadian crude oil to reach markets in the United States
and eastern Canada. The diversion of western Canadian crude oil away from the
IPL System, whether by virtue of increased demand by western Canadian refiners
or the shipment of crude oil by other pipelines, would likely have a direct
impact on the volumes transported by the Lakehead System. Although the General
Partner believes that under regulations of the Federal Energy Regulatory
Commission ("FERC") the Partnership will periodically be allowed to increase
tariff rates to compensate for declines in throughput which result in a
substantial divergence between the Partnership's costs and tariff rates, there
can be no assurance that this will be the case. Even if such tariff increases
were allowed, the Partnership may suffer lower revenues during the period before
a tariff adjustment can be implemented. In addition, reduced throughput on the
IPL System as a result of testing, line repair, reduced operating pressures or
other causes could result in reduced throughput on the Lakehead System. If the
Partnership were not able to recoup lost revenue related to such reduced
throughput, the Partnership could be adversely impacted.

  Reduced Demand Could Affect Shipments on the Lakehead System

     The Partnership's business depends in part on the level of demand for crude
oil and natural gas liquids (in particular, western Canadian crude oil and
natural gas liquids) in the geographic areas in which deliveries are made by the
Lakehead System and the ability and willingness of shippers having access to the
Lakehead System to satisfy such demand by deliveries through the Lakehead
System. Demand for western Canadian crude oil and natural gas liquids in the
geographic areas served by the Lakehead System is affected by the delivery of
other supplies of crude oil and refined products into such geographic areas.
Existing pipeline capacity for the delivery of crude oil to the Midwest U.S.,
the primary market served by the Lakehead System, exceeds current refining
capacity. In addition, IPL and a group of refiners have developed a project to
reverse the flow of a portion of the IPL System from Sarnia to Montreal, Quebec
to bring crude oil from Montreal to Sarnia. The reversal of this line would
result in IPL becoming a competitor of the Partnership for supplying crude oil
to the Ontario market and is expected to reduce the deliveries of western
Canadian crude oil into the eastern Canadian markets served by the System (as
defined herein). When the reversal of the line is effective (which is expected
in 1999), quantities of crude oil historically delivered by the System to the
Ontario market are expected to be redirected to existing U.S. markets served by
the Lakehead System, although at reduced tariffs (due to shorter transportation
distances). The Partnership cannot predict the impact of future economic
conditions, fuel conservation measures, alternative fuel requirements,
governmental regulation or technological advances in fuel economy and energy
generation devices, all of which could reduce the demand for crude oil and other
liquid hydrocarbons in the areas in which deliveries are made by the Lakehead
System.

  Uncertainty Arising From Ratemaking Methodologies

     As an interstate common carrier, the Partnership's pipeline operations are
subject to regulation by the FERC under the Interstate Commerce Act, which
permits challenges to proposed or changed rates and to rates that are already
effective by protest or complaint, respectively, by an interested person or upon
the FERC's own motion. Proposed or changed rates may be suspended by the FERC
for up to seven months and
                                        4
<PAGE>   28

allowed to become effective subject to investigation and potential refund. Rates
that are already effective may be ordered to be reduced for the future and, upon
an appropriate showing, reparations may be awarded for damages sustained by a
complainant as a result of such rates for up to two years prior to the
commencement of an investigation.

     In October 1993, the FERC established a new ratemaking methodology for
liquids pipelines to be effective January 1, 1995 allowing for the annual
indexing of rate ceilings based on changes in a producer price index. Rate
ceilings may increase or decrease depending upon the change in the index minus
1%. The order also provides that, under certain circumstances, pipelines or
shippers may seek to establish cost-based or market-based rates rather than
indexed rates. To the extent this order limits the ability of the Partnership to
establish cost-based rates, or the indexing methodology restricts or delays the
Partnership's ability to implement rates that reflect increased costs, the
Partnership could be adversely affected. Furthermore, no assurances can be given
that inflationary rate increases allowed under the FERC's indexing methodology
will be sufficient to offset increases in the Partnership's costs. In addition,
if the applicable index increases less than 1% or decreases, the FERC's indexing
methodology could result in a corresponding reduction in tariffs, as was the
case in July 1998. See "Items 1 and 2. Business and Properties -- Regulation" in
the Form 10-K.

     Many of the ratemaking issues contested in the Partnership's prior rate
cases, in particular the FERC's oil pipeline ratemaking methodology, have not
previously been reviewed by a federal appellate court. Any decision ultimately
rendered by the FERC on any rate case involving its oil pipeline ratemaking
methodology may be subject to judicial review. Any such judicial review could
ultimately result in alternative ratemaking methodologies that could have a
material adverse effect on the Partnership.

     There is also pending at the FERC a proceeding involving another publicly
traded limited partnership engaged in the common carrier transportation of crude
oil (the "Santa Fe Proceeding") in which the FERC could further limit its
current position related to the tax allowance permitted in the rates of publicly
traded partnerships, as well as possibly altering the FERC's current application
of the FERC oil pipeline ratemaking methodology. On September 25, 1997, the
administrative law judge in the Santa Fe Proceeding issued an initial decision
addressing various aspects of the tax allowance issue as it affects publicly
traded partnerships, as well as various technical issues involving the
application of the FERC oil pipeline ratemaking methodology. The administrative
law judge's initial decision in the Santa Fe Proceeding is currently pending
review by the FERC. In such review, it is possible that the FERC could alter its
current rulings on the tax allowance issue or on the application of the FERC oil
pipeline ratemaking methodology in a way that could, if applied to the
Partnership, have a material adverse impact on the Partnership.

     The Partnership's operating income and cash flow will remain sensitive to
the level of tariffs established from time to time under rules and regulations
of the FERC. The Partnership anticipates filing a tariff surcharge in late 1998
or early 1999 to reflect the projected incremental costs and throughput
resulting from its System Expansion Program II ("SEP II") and Terrace Expansion
Program ("Terrace"). The Settlement Agreement entered into in 1996 between the
Partnership and representatives of the Partnership's customers on all their
outstanding contested tariffs (the "Settlement Agreement") sets forth parameters
governing the tariff surcharge associated with SEP II, although certain details
of implementation remain subject to further discussions. The Partnership has
also entered into an agreement with customer representatives regarding the
tariff surcharge associated with Terrace. Customers who are not parties to the
Settlement Agreement may challenge any tariff rate filing. It is anticipated
that advance approval will be sought from the FERC for the tariff surcharges for
SEP II and Terrace. See "Items 1 and 2. Business and Properties -- SEP II
Expansion Program," "-- Terrace Expansion Program" and "-- Tariffs" in the Form
10-K. Any challenges of the Partnership's tariff rates, if successful, could
have a material adverse effect on the Partnership.

  SEP II Right of Way Acquisition and Permitting

     In May 1997, the ICC denied the Partnership's application for a certificate
that is a necessary step toward receiving condemnation authority in Illinois
with respect to SEP II. Without such condemnation authority, the cost to obtain
rights of way in connection with SEP II has increased.

                                        5
<PAGE>   29

     The Partnership is currently seeking and acquiring environmental and
construction permits necessary to construct the new pipeline in connection with
SEP II. Delays in acquiring environmental or construction permits could delay
the in-service date of the new pipeline.

  Competition

     Because pipelines have historically been the lowest cost method for
intermediate and long haul overland movement of crude oil, the System's most
significant existing competitors for the transportation of western Canadian
crude oil (other than indigenous consumption in western Canada) are other
pipelines. The System encounters competition in serving shippers to the extent
that shippers have alternate opportunities for transporting liquid hydrocarbons
from their sources to customers. IPL has advised the General Partner that in
1997 the IPL System transported approximately 65% of total western Canadian
crude oil production, of which approximately 90% was transported by the Lakehead
System. The remainder was refined in Alberta or Saskatchewan or transported
through other pipelines to British Columbia, Washington, Montana and other
states in the Northwest U.S. In the United States, the Lakehead System
encounters competition from other crude oil and refined product pipelines and
other modes of transportation delivering crude oil and refined products to the
refining centers of Minneapolis-St. Paul, Chicago, Detroit and Toledo and the
refinery market and pipeline hub located in the Patoka/Wood River area. See
"Items 1 and 2. Business and Properties -- Competition" in the Form 10-K.

  Risk of Environmental and Safety Costs and Liabilities

     The operations of the Partnership are subject to federal and state laws and
regulations relating to environmental protection and operational safety.
Although the General Partner believes that the operations of the Lakehead System
are in substantial compliance with applicable environmental and safety
regulations, risks of substantial costs and liabilities are inherent in pipeline
operations, and there can be no assurance that such costs and liabilities will
not be incurred. Moreover, it is possible that other developments, such as
increasingly strict environmental and safety laws, regulations and enforcement
policies thereunder, and claims for damages to property or persons resulting
from the Partnership's operations, could result in substantial costs and
liabilities to the Partnership. If the Partnership were not able to recover such
resulting costs through insurance or increased tariffs, the Partnership could be
adversely affected.

     Various federal, state and local laws and regulations impose strict
controls on the discharge of oil and certain other materials into navigable
waters. Such laws and regulations provide civil and criminal penalties and
liabilities for discharge of petroleum and certain other materials in reportable
quantities, impose liability for cleanup costs and natural resource damage and
allow for third party lawsuits. Spill prevention control and countermeasure
requirements of these laws require diking and similar structures to help prevent
releases into navigable waters in the event of a petroleum overflow, rupture or
leak.

     Contamination resulting from spills of crude oil and petroleum products is
not unusual within the petroleum pipeline industry. The Lakehead System has, in
the past, and may, in the future, experience such spills or other discharges. In
the course of pipeline construction, directional drilling of pipeline conduits
can result in discharges of drilling related materials to the soil, groundwater,
surface waters or wetlands. In late July and early August of 1998, the Company's
directional drilling operations for SEP II pipeline construction in Illinois
caused the discharge of non-hazardous bentonite material in a wetlands area. The
Company reported the matter to the U.S. Army Corps of Engineers ("Corps") and to
the Illinois Department of Natural Resources. Pursuant to a United States
Environmental Protection Agency ("EPA") order, the Company suspended drilling
operations while it prepared a restoration plan, among other items. Pursuant to
a new EPA order, which superseded the prior EPA order, the Company has resumed
drilling operations in the area under conditions deemed acceptable by the
Company. The Company also agreed to certain changes in the Corps drilling
permit. While EPA reserved its right to issue civil penalties and injunctive
relief, the General Partner does not anticipate that any penalties which might
later be assessed by EPA will have a material impact on the financial condition
of the Partnership.

     In addition, on September 16, 1998, as a result of a leak in a pipeline
located in northern Minnesota, approximately 5,700 barrels of crude oil were
released. The pipeline was repaired and restored to service on September 18,
1998, and cleanup has been largely completed. Based on preliminary information
available to date, the General Partner believes that the leak was caused by
third-party damage to the pipeline. The General Partner estimates that to date
$500,000 has been expended on cleanup and repair activities and

                                        6
<PAGE>   30

anticipates that an additional $500,000 will be incurred over the next three
years to completely remediate the leak site. Whether or not the leak was caused
by third-party damage, the General Partner does not believe that any cleanup
costs, monitoring costs, liabilities and penalties relating to this spill will
have a material adverse effect on the operations or financial condition of the
Partnership. The Partnership is exploring its options with respect to recovery
of the costs of the leak from third-parties and/or insurance.

     The General Partner has, from time to time, hydrostatically tested certain
portions of the Lakehead System. If additional hydrostatic testing is determined
necessary by the General Partner or were to be required by a regulatory
authority, such testing could result in significant, and perhaps material,
expense arising out of treatment and disposal of the hydrostatic test water and
downtime resulting in lost transportation revenues. While the General Partner
believes suitable alternatives to hydrostatically testing the pipeline exist, no
assurance can be given that future hydrostatic testing will not be required on
the System. Hydrostatic testing of the IPL System in Canada potentially may
decrease deliveries on the Lakehead System due to restrictions on volumes
received from western Canada.

CONSIDERATIONS RELATING TO THE COMPANY'S INDEBTEDNESS

     The Company's secured indebtedness will be effectively senior to the Debt
Securities, and the indenture relating to the Debt Securities will not limit the
Company's ability to incur additional indebtedness. The Company had long-term
debt of $610 million as of August 31, 1998, all of which was secured by
substantially all of the Company's assets. In addition, the General Partner
expects the Company to incur additional indebtedness from time to time to fund a
portion of the remaining cost of SEP II and the expected cost of phase one of
Terrace and to fund a portion of its other expansion programs and capital
expenditures. The $610 million of long-term secured debt as of August 31, 1998
consisted of $310 million of the Partnership's first mortgage notes ("First
Mortgage Notes"), which have no principal payments due until 2002, and $300
million outstanding under the Partnership's $350 million revolving bank credit
facility (the "Revolving Credit Facility"). The Revolving Credit Facility has a
five-year term with an "evergreen" provision that automatically extends the
maturity date each year by an additional year unless the banks give notice to
the Company of their intent not to extend. The current maturity date of the
Revolving Credit Facility is September 6, 2003. See "Item 7. Management's
Discussion and Analysis of Financial Condition and Results of
Operations -- Liquidity and Capital Resources" in the Form 10-K.

     The agreements relating to the First Mortgage Notes and the Revolving
Credit Facility contain a number of covenants that restrict the ability of the
Company to dispose of assets, merge or consolidate with another entity, incur
additional indebtedness, create liens, make capital expenditures or other
investments or acquisitions and otherwise restrict business activities. The
ability of the Company to comply with such provisions may be affected by events
that are beyond the Partnership's control. The breach of any of these covenants
could result in a default under the First Mortgage Notes and the Revolving
Credit Facility. In addition, as a result of these covenants, the ability of the
Company to respond to changing business and economic conditions and to secure
additional financing, if needed, may be restricted, and the Company may be
prevented from engaging in transactions that might otherwise be considered
beneficial to the holders ("Holders") of the Debt Securities.

CONSIDERATIONS RELATING TO CANADIAN CONTROLLING PERSONS

  Difficulty in Enforcing Civil Liabilities Against Officers, Directors and
Controlling Persons

     Certain of the controlling persons of the Partnership, within the meaning
of the U.S. federal securities laws, and certain of the officers and directors
of the General Partner are not residents of the United States, and all or a
substantial portion of their assets are located outside the United States. As a
result, it may be difficult for Holders of the Debt Securities to effect service
of process within the United States with respect to such persons, officers and
directors predicated upon civil liabilities under the United States federal
securities laws. The Partnership has been advised by Canadian counsel that there
is doubt as to the enforceability against such persons in Canada, in original
actions or in actions for the enforcement of judgments of United States courts,
of liabilities predicated solely upon the federal securities laws of the United
States.

                                        7
<PAGE>   31

                                THE PARTNERSHIP

     Lakehead is a publicly traded Delaware limited partnership that owns and
operates, through the Company, a regulated crude oil and natural gas liquids
("NGLs") pipeline business in the United States. Lakehead Pipe Line Company,
Inc. (the "General Partner"), a wholly owned subsidiary of Interprovincial Pipe
Line Inc. ("IPL") and an indirect, wholly owned subsidiary of IPL Energy Inc.
("IPL Energy") of Calgary, Alberta, Canada, serves as the general partner of
Lakehead and the Company. IPL Energy is a publicly traded company that is a
North American leader in energy services and delivery. The General Partner owns
a 14.8% limited partner interest (in the form of 3,912,750 Class B Common Units)
and a 1% general partner interest in Lakehead, and a 1.0101% general partner
interest in the Company, representing an effective combined 16.6% interest in
the Partnership. The remaining 83.4% limited partner interest in the Partnership
is represented by 22,290,000 publicly traded Class A Common Units.

     The following chart depicts the organization and ownership of Lakehead, the
Company and the General Partner. The percentages reflected in the chart
represent the approximate ownership interest in each of Lakehead and the
Company, individually. Except in the following chart, the ownership percentages
referred to in this Prospectus and any accompanying Prospectus Supplement
reflect the approximate effective ownership interest of the holders in Lakehead
and the Company on a combined basis.

                              [ORGANIZATION CHART]
EDGAR DESCRIPTION
     Organizational chart depicting the following organizational and ownership
information for the Company, Lakehead and the General Partner.
                            OWNERSHIP OF THE COMPANY

<TABLE>
<CAPTION>
   PERCENTAGE/TYPE OF INTEREST                                         INTEREST HELD
              HELD                                                           BY
<S>                                <C>                               <C>
98.9899% limited partner interest                                    Lakehead
1.0101% general partner interest                                     General Partner
</TABLE>

                             OWNERSHIP OF LAKEHEAD

<TABLE>
<CAPTION>
   PERCENTAGE/TYPE OF INTEREST           NUMBER/TYPE OF UNITS          INTEREST HELD
              HELD                                                           BY
<S>                                <C>                               <C>
84.2% limited partner interest     22,290,000 Class A Common Units   Public Unitholders
14.8% limited partner interest     3,912,750 Class B Common Units    General Partner
1% general partner interest                                          General Partner
</TABLE>

                        OWNERSHIP OF THE GENERAL PARTNER

<TABLE>
<CAPTION>
   PERCENTAGE/TYPE OF INTEREST                                         INTEREST HELD
              HELD                                                           BY
<S>                                <C>                               <C>
100% Common Shares                                                   IPL
</TABLE>

     The Partnership and IPL are engaged in the transportation of crude oil and
other liquid hydrocarbons through the world's longest liquid petroleum pipeline
system (the "System"). The System is the primary transporter of crude oil from
western Canada to the United States and is the only pipeline that transports
crude oil from western Canada to eastern Canada. The System serves all the major
refining centers in the Great Lakes region of the United States, as well as the
Province of Ontario, Canada and, through a connecting pipeline, the Patoka/Wood
River refinery market and pipeline hub in southern Illinois. The System, which
                                        8
<PAGE>   32

traverses approximately 3,200 miles, consists of a Canadian portion (the "IPL
System"), which is owned by IPL, and a United States portion (the "Lakehead
System"), which is owned by the Partnership.

     Shipments tendered to the IPL System originate in oil fields in the western
Canadian provinces of Alberta, Saskatchewan, Manitoba and British Columbia and
in the Northwest Territories of Canada and reach the IPL System through
facilities owned and operated by third parties or affiliates of IPL. Deliveries
from the IPL System are currently made in the prairie provinces of Canada and,
through the Lakehead System, in the Great Lakes and Midwest regions of the
United States and the Province of Ontario, principally to refineries, either
directly or through connecting pipelines of other companies.

     The IPL System extends approximately 1,200 miles from Edmonton, Alberta,
across the Canadian prairies to the U.S. border near Neche, North Dakota, and
continues from the U.S. border near Marysville, Michigan, to Toronto, Ontario,
and Montreal, Quebec, with lateral lines to Nanticoke, Ontario, and Niagara
Falls, Ontario. The IPL System includes a pipeline which is owned and operated
by Interprovincial Pipe Line (NW) Ltd., a wholly owned subsidiary of IPL Energy.
This pipeline extends approximately 540 miles between Norman Wells, Northwest
Territories and Zama, Alberta, and connects from Zama, through a system owned by
others, to the IPL System at Edmonton.

     The Lakehead System traverses approximately 1,750 miles from the Canadian
border near Neche, to the Canadian border near Marysville. The Lakehead System
consists of three separate lines extending from the Canadian border near Neche
to Superior, Wisconsin, and a line from the Canadian border near Neche to
Clearbrook, Minnesota. At Superior, the pipeline continues as two separate and
diverging lines, one traversing through the upper Great Lakes region and the
other through the lower Great Lakes region of the United States, with both lines
re-entering Canada at a point near Marysville. The Lakehead System also includes
a lateral line from the Canadian border near Niagara Falls to the Buffalo, New
York area. Crude oil and NGLs are received by the Lakehead System at the
Canadian border from the IPL System and, to a lesser extent, at a number of
other receipt points and are scheduled into the pipeline in accordance with
customer nominations.

     All scheduling of shipments (including routes, storage, etc.) is handled by
IPL in coordination with the General Partner. The Lakehead System includes 16
connections to pipelines and refineries at various locations in the United
States, including the Chicago, Illinois, Minneapolis-St. Paul area of Minnesota,
Detroit, Michigan, Toledo, Ohio and Buffalo refining areas, and, through a
connecting pipeline, the Patoka/Wood River refinery market and pipeline hub. As
of June 30, 1998, the Lakehead System had approximately nine million barrels of
tankage capacity at its three main terminals at Clearbrook, Superior and
Griffith, Indiana. The tankage capacity is utilized both to gather crude oil
prior to injection into the Lakehead System and to provide tankage in order to
facilitate more flexible oil movements scheduling. At Superior, all crude oil is
removed from the Lakehead System, directed into tankage and then, when
appropriate to meet the requirements of batch movements, reinjected into the
Lakehead System for delivery through either the upper Great Lakes region or the
lower Great Lakes region.

     The principal executive offices of Lakehead, the Company and the General
Partner are located at Lake Superior Place, 21 West Superior Street, Duluth,
Minnesota 55802, and its telephone number at such offices is (800) 525-3999 or
(218) 725-0100.

                                        9
<PAGE>   33

                                USE OF PROCEEDS

     Unless otherwise specified in a related Prospectus Supplement, the net
proceeds received by the Company from the sale of Debt Securities will be used
for general partnership purposes, including the expansion of the Lakehead
System.

                       RATIO OF EARNINGS TO FIXED CHARGES

<TABLE>
<CAPTION>
                                          YEARS ENDED DECEMBER 31,            SIX MONTHS
                                   --------------------------------------   ENDED JUNE 30,
                                   1993   1994    1995      1996     1997        1998
                                   ----   ----   -------   -------   ----   --------------
<S>                                <C>    <C>    <C>       <C>       <C>    <C>
Ratio of Earnings to Fixed
  Charges........................  2.6x   2.7x   1.9x(1)   2.1x(2)   2.8x        2.9x
</TABLE>

---------------

(1) Net earnings of the Partnership for 1995 were impacted by a prior years'
    rate refund and interest accrual adjustment of $22.9 million and $1.5
    million, respectively, resulting from the June 1995 decision (Opinion No.
    397) of the FERC. See "Items 1 and 2. Business and Properties -- Tariffs" in
    the Form 10-K.

(2) Net earnings of the Partnership for 1996 were impacted by a non-recurring
    rate refund and interest accrual adjustment of $20.1 million and $3.2
    million, respectively, resulting from the 1996 Settlement Agreement. See
    "Items 1 and 2. Business and Properties -- Tariffs" in the Form 10-K.

     For purposes of calculating the ratio of earnings to fixed charges: (i)
"fixed charges" represent interest expense (including amounts capitalized),
amortization of debt costs and the portion of rental expense representing the
interest factor; and (ii) "earnings" represent the aggregate of income from
continuing operations before income taxes, interest expense, amortization of
debt costs and the portion of rental expense representing the interest factor.

                                       10
<PAGE>   34

                       DESCRIPTION OF THE DEBT SECURITIES

     The Debt Securities offered hereby will represent unsecured obligations of
the Company. The Debt Securities will constitute either Senior Debt Securities
or Subordinated Debt Securities. The Senior Debt Securities will be issued under
an Indenture dated as of September 15, 1998 (the "Senior Indenture"), between
the Company and The Chase Manhattan Bank, as trustee under the Senior Indenture.
The Subordinated Debt Securities will be issued under an Indenture dated as of
September 15, 1998 (the "Subordinated Indenture"), between the Company and The
Chase Manhattan Bank, as trustee under the Subordinated Indenture. The Senior
Indenture and the Subordinated Indenture are sometimes hereinafter referred to
herein individually as an "Indenture" and collectively as the "Indentures." The
Chase Manhattan Bank, as trustee under each of the Indentures (and any successor
thereto under each Indenture), is referred to herein as the "Trustee."

     The terms of the Debt Securities include those stated in the respective
Indentures and those made part of the respective Indentures by reference to the
Trust Indenture Act. The Debt Securities will be subject to all such terms, and
Holders of Debt Securities are referred to the Indentures and the Trust
Indenture Act for a statement of those terms. The Senior Indenture and the
Subordinated Indenture will be substantially identical, except for the
provisions relating to subordination and certain covenants. See "Provisions
Applicable Solely to Senior Debt Securities" and "Provisions Applicable Solely
to Subordinated Debt Securities."

     The statements set forth below in this section are brief summaries of
certain provisions contained in the Indentures, do not purport to be complete,
and are subject to, and are qualified in their entirety by reference to, all the
provisions of the Indentures, including the definitions therein of certain
terms. Copies of the Indentures are filed as exhibits to the Registration
Statement of which this Prospectus is a part. Capitalized terms used in this
section and not otherwise defined in this section have the respective meanings
assigned to them in the Indentures.

PROVISIONS APPLICABLE TO BOTH SENIOR AND SUBORDINATED DEBT SECURITIES

     General. The Indentures do not limit the aggregate principal amount of Debt
Securities which may be issued thereunder and provide that Debt Securities may
be issued from time to time thereunder in one or more series, each in an
aggregate principal amount authorized by the Company prior to issuance. The
Indentures do not limit the amount of other unsecured indebtedness or securities
which may be issued by the Company.

     The Debt Securities are not expected to be secured by any of the assets of
the Company and will, therefore, be effectively subordinated to all indebtedness
of the Company that is secured, to the extent of the value of the assets
securing such indebtedness. The amount of the Company's long term debt, and the
amount thereof that is secured, outstanding at the time of the issuance of a
series of Debt Securities, will be disclosed in the Prospectus Supplement
relating to such series of Debt Securities. In addition, the Debt Securities
will be effectively subordinated to any indebtedness or other obligations of any
subsidiaries of the Company outstanding from time to time.

     Reference is made to the Prospectus Supplement relating to the particular
series offered thereby for the terms of such Debt Securities, including where
applicable: (a) the form and title of the Debt Securities; (b) the aggregate
principal amount of the Debt Securities; (c) the date or dates on which the Debt
Securities may be issued; (d) the date or dates on which the principal of and
premium, if any, on the Debt Securities shall be payable; (e) the rate or rates
(which may be fixed or variable), or the method of determination thereof, at
which the Debt Securities shall bear interest, if any, and the date or dates
from which such interest shall accrue; (f) the dates on which interest, if any,
shall be payable and the record dates for the interest payment dates; (g) the
place or places where the principal of and premium, if any, and interest, if
any, on the Debt Securities of the series will be payable; (h) the period or
periods, if any, within which, the price or prices at which, and the terms and
conditions upon which, the Debt Securities may be redeemed at the option of the
Company or otherwise; (i) any optional or mandatory redemption or any sinking
fund or analogous provisions; (j) if other than denominations of $1,000 and
integral multiples thereof, the denominations in which the Debt Securities of
the series shall be issuable; (k) if other than the principal amount thereof,
the portion of the principal amount of the Debt Securities which shall be
payable upon declaration of the acceleration of the
                                       11
<PAGE>   35

maturity thereof in accordance with the provisions of the Indenture; (l) whether
payment of the principal of and premium, if any, and interest, if any, on the
Debt Securities shall be without deduction for taxes, assessments, or
governmental charges paid by the Holders; (m) the currency or currencies, or
currency unit or currency units, in which the principal of and premium, if any,
and interest, if any, on the Debt Securities shall be denominated, payable,
redeemable or purchasable, as the case may be; (n) any Events of Default (as
defined below) with respect to the Debt Securities that differ from those set
forth in the applicable Indenture; (o) whether the Debt Securities will be
convertible; (p) whether the Debt Securities of such series shall be issued as a
global certificate or certificates and, in such case, the identity of the
depositary for such series and whether in temporary or permanent global form;
(q) provisions regarding the convertibility or exchangeability of the Debt
Securities; (r) whether the Debt Securities are Senior Debt Securities or
Subordinated Debt Securities; (s) the terms and conditions upon which and the
manner in which such series of Debt Securities may be defeased or discharged if
different from the defeasance and discharge provisions described under
"Satisfaction and Discharge; Legal and Covenant Defeasance" below; (t) any
deletions or modifications of or additions to the Events of Default or covenants
of the Company pertaining to the Debt Securities; (u) any restrictions or other
provisions with respect to the transfer or exchange of the Debt Securities; (v)
the Person to whom any interest on a Debt Security of the series shall be
payable, if other than the Person in whose name that Debt Security (or one or
more Predecessor Securities) is registered at the close of business on the
Regular Record Date for such interest; (w) if the amount of payments of
principal of or any premium or interest on any Debt Securities of the series may
be determined with reference to an index, the manner in which such amounts shall
be determined; (x) if the principal of or any premium or interest on any Debt
Securities of the series is to be payable, at the election of the Company or a
Holder thereof, in one or more currencies or currency units other than that or
those in which the Debt Securities are stated to be payable, the currency,
currencies or currency units in which payment of the principal of and any
premium and interest on Debt Securities of such series as to which such election
is made shall be payable, and the periods within which and the terms and
conditions upon which such election is to be made; (y) the right, if any, of the
Company to defer payments of interest by extending the interest payment periods
and to specify the duration of such extension, the Interest Payment Dates on
which such interest shall be payable and whether and under what circumstances
additional interest on amounts deferred shall be payable; (z) if other than the
Trustee, the identity of the Security Registrar and any Paying Agent; and (aa)
any other terms of the Debt Securities of the series not inconsistent with the
Indentures.

     All Debt Securities of any one series need not be issued at the same time
and, unless otherwise provided, a series may be reopened, without the consent of
the Holders, for increases in the aggregate principal amount of such series of
Debt Securities and issuances of additional Debt Securities of such series or
for the establishment of additional terms with respect to the Debt Securities of
such series.

     If any Debt Securities offered hereby are sold for foreign currencies or
foreign currency units or if the principal of and premium, if any, or interest,
if any, on any series of Debt Securities is payable in foreign currencies or
foreign currency units, the restrictions, elections, tax consequences, specific
terms and other information with respect to such issue of Debt Securities and
such currencies and currency units will be set forth in the Prospectus
Supplement relating thereto.

     One or more series of Debt Securities offered hereby may be sold at a
discount (which may be substantial) below their stated principal amount, bearing
no interest or interest at a rate that at the time of issuance is below market
rates. The federal income tax consequences and special considerations applicable
to any such series of Debt Securities will be described generally in the
Prospectus Supplement relating to such series.

     Form, Exchange and Transfer. Unless otherwise indicated in the Prospectus
Supplement relating thereto, the Debt Securities offered hereby will be issued
only in registered form in denominations of $1,000 or any integral multiple
thereof. The Debt Securities of a series may be issuable in the form of one or
more global certificates, which will be denominated in an amount equal to all or
a portion of the aggregate principal amount of such Debt Securities. See
"-- Global Debt Securities."

                                       12
<PAGE>   36

     At the option of the Holders, subject to the terms of the Indenture and the
limitations applicable to Global Securities, Debt Securities of each series will
be exchangeable for other Debt Securities of the same series, of any authorized
denomination and of a like tenor and aggregate principal amount.

     Subject to the terms of the Indenture and the limitations applicable to
Global Securities, Debt Securities may be presented for exchange as provided
above or for registration of transfer (duly endorsed or with the form of
transfer endorsed thereon duly executed) at the office of the Security Registrar
or at the office of any transfer agent designated by the Company for such
purpose. No service charge will be made for any registration of transfer or
exchange of Debt Securities, but the Company may require payment of a sum
sufficient to cover any tax or other governmental charge payable in connection
therewith. Such transfer or exchange will be effected upon the Security
Registrar or such transfer agent, as the case may be, being satisfied with the
documents of title and identity of the person making the request. The Company
has appointed the Trustee as Security Registrar. Any transfer agent (in addition
to the Security Registrar) initially designated by the Company for any Debt
Securities will be named in the applicable Prospectus Supplement. The Company
may at any time designate additional transfer agents or rescind the designation
of any transfer agent or approve a change in the office through which any
transfer agent acts, except that the Company will be required to maintain a
transfer agent in each Place of Payment for the Debt Securities of each series.

     Neither the Trustee nor the Company will be required to (a) issue, register
the transfer of or exchange any Debt Security of any series (or of any series
and specified tenor, as the case may be) during a period beginning at the
opening of business 15 days before the day of mailing of a notice of redemption
of any such Debt Security that may be selected for redemption and ending at the
close of business on the day of such mailing, or (b) register the transfer of or
exchange any Debt Security so selected for redemption, in whole or in part,
except the unredeemed portion of any Debt Security being redeemed in part.

     Global Debt Securities. The Debt Securities of a series may be issued in
whole or in part in the form of one or more global certificates that will be
deposited with, or on behalf of, a depositary (the "Depositary"), or its
nominee, identified in the Prospectus Supplement relating to such series. Global
Debt Securities may be issued in either temporary or permanent form. Unless and
until such global certificate or certificates are exchanged in whole or in part
for Debt Securities in individually certificated form, a global Debt Security
may not be transferred or exchanged except as a whole to a nominee of the
Depositary for such global Debt Security, or by a nominee for the Depositary to
the Depositary, or to a successor of the Depositary or a nominee of such
successor, except in the circumstances described in the applicable Prospectus
Supplement.

     The specific terms of the depositary arrangement with respect to a series
of Debt Securities and the rights of, and limitations on, owners of beneficial
interests in a global Debt Security representing all or a portion of a series of
Debt Securities will be described generally in the Prospectus Supplement
relating to such series.

     Consolidation, Merger and Sale of Assets. Each Indenture provides that the
Company shall not consolidate with or merge into any other Person or sell, lease
or transfer its properties and assets as, or substantially as, an entirety to,
any Person, unless (i) (A) in the case of a merger, the Company is the surviving
entity or (B) the Person formed by such consolidation or into which the Company
is merged or the Person which acquires by sale or transfer, or which leases the
properties and assets of the Company as, or substantially as, an entirety shall
expressly assume by supplemental indenture payment of the principal of and any
premium and interest on all the Debt Securities and the performance or
observance of every covenant of and condition of the Indenture applicable to the
Company; (ii) the surviving entity or successor Person is a Person organized and
existing under the laws of the U.S., any State thereof or the District of
Columbia; (iii) immediately after giving effect to the transaction, no Default
or Event of Default exists; and (iv) the Company has delivered the Officer's
Certificate and the Opinion of Counsel required by the Indenture. Any such
successor Person shall succeed to and be substituted for, and may exercise every
right and power of, the Company under the relevant Indenture with the same
effect as if it had been named originally as a party in the Indenture and the
Company shall (except in the case of a lease) be released and discharged from
all its obligations under the Indenture and the Debt Securities outstanding
thereunder.

     Events of Default. Unless otherwise provided with respect to any series of
Debt Securities, an "Event of Default" will occur under each Indenture with
respect to Debt Securities of a particular series issued
                                       13
<PAGE>   37

thereunder upon: (a) default in the payment of the principal of, or premium, if
any, on, any Debt Security of such series at its maturity; (b) default in the
payment of any interest on any Debt Security of such series when it becomes due
and payable and continuance of such default for a period of 30 days; (c) default
in the performance, or breach, of any term, covenant or warranty contained in
the Indenture with respect to such series and continuance of such default or
breach for a period of 60 days after there has been given to the Company by the
Trustee or to the Company and the Trustee by the Holders of at least 25% in
principal amount of the outstanding Debt Securities of that series a written
notice as provided in the Indenture; (d) the occurrence of certain events of
bankruptcy, insolvency or reorganization of the Company; or (e) any other Event
of Default applicable to such series.

     Each Indenture provides that if an Event of Default with respect to a
series of Debt Securities issued thereunder shall have occurred and be
continuing, either the Trustee or the Holders of not less than 25% in principal
amount of Debt Securities of such series then outstanding may declare the
principal amount (or, if any of the Debt Securities of that series are Original
Issue Discount Securities, such portion of the principal amount of such Debt
Securities as may be specified in the terms thereof) of, and accrued but unpaid
interest, if any, on all Debt Securities of such series to be due and payable
immediately upon giving written notice as provided in the Indenture. Each
Indenture provides that the Holders of a majority in principal amount of Debt
Securities then outstanding of such series may rescind and annul such
declaration and its consequences under certain circumstances.

     The Holders of a majority in principal amount of Debt Securities of a
series then outstanding may waive past defaults under the Indenture with respect
to such series and its consequences (except a continuing default in the payment
of principal of or premium, if any, or interest on any series of Debt Securities
or a default in respect of any covenant or provision of the Indenture which
cannot be modified or amended without the consent of the Holder of each
outstanding Debt Security affected thereby).

     Pursuant to each Indenture, the Holders of a majority in aggregate
principal amount of each affected series of Debt Securities then outstanding
thereunder may direct with respect to such series the time, method, and place of
conducting any proceeding for any remedy available to the Trustee or exercising
any trust or power conferred on the Trustee, subject to certain limitations
specified in that Indenture. Before proceeding to exercise any right or power
under an Indenture at the direction of any Holders, the Trustee thereunder shall
be entitled to receive from such Holders of Debt Securities outstanding under
that Indenture reasonable security or indemnity against the costs, expenses, and
liabilities which might be incurred by it in compliance with any such direction.

     Pursuant to each Indenture, no Holder of a Debt Security of any series will
have any right to institute any proceeding with respect to that Indenture, or
for the appointment of a receiver or trustee, or for any other remedy
thereunder, unless (a) such Holder has previously given to the Trustee written
notice of a continuing Event of Default with respect to the Debt Securities of
that series, (b) the Holders of at least 25% in aggregate principal amount of
the outstanding Debt Securities of that series have made written request to the
Trustee, and such Holder or Holders have offered reasonable indemnity, to the
Trustee to institute such proceeding and (c) the Trustee has failed to institute
such proceeding, and has not received from the Holders of a majority in
aggregate principal amount of the outstanding Debt Securities of that series a
direction inconsistent with such request, within 60 days after such notice,
request and offer. However, such limitations do not apply to a suit instituted
by a Holder of a Debt Security for the enforcement of payment of the principal
of or any premium or interest on such Debt Security on or after the applicable
due date specified in such Debt Security.

     Under the terms of each Indenture, the Company is required to furnish to
the Trustee annually an Officer's Certificate to the effect that to the best of
such officer's knowledge, the Company is not in default in the performance and
observance of the terms, provisions and conditions of the Indenture or, if such
officer has knowledge that the Company is in default, specifying such default.
Each Indenture requires the Trustee thereunder to give to all Holders of Debt
Securities outstanding thereunder notice of any Default by the Company in the
manner provided in the Indenture, unless such Default shall have been cured or
waived; however, except in the case of a default in the payment of principal of
and premium, if any, or interest, if any,

                                       14
<PAGE>   38

on any Debt Securities outstanding thereunder, the Trustee is entitled to
withhold such notice if it determines in good faith that withholding such notice
is in the interest of the Holders of such outstanding Debt Securities.

     Satisfaction and Discharge; Legal and Covenant Defeasance. Under the terms
of each Indenture, the Company may satisfy and discharge certain obligations to
Holders of Debt Securities of any series which have not already been delivered
to the Trustee for cancellation and which have either become due and payable or
are by their terms due and payable within one year or are to be called for
redemption within one year by (i) irrevocably depositing or causing to be
deposited with the Trustee an amount of money in the currency or currency units
in which such Debt Securities are payable sufficient to pay the principal and
any premium and interest to the date of such deposit (in case of Debt Securities
of such series which have become due and payable) or to the Stated Maturity or
Redemption Date, as the case may be; (ii) paying or causing to be paid all other
sums payable under the Indenture with respect to such Debt Securities; and (iii)
delivering to the Trustee an Officer's Certificate and Opinion of Counsel
relating to such satisfaction and discharge.

     Each Indenture also provides that, unless otherwise specified with respect
to Debt Securities of any series, the Company and any other obligor thereunder,
if any, will be deemed to have paid and discharged the entire indebtedness on
all Debt Securities of such series on the 91st day following the deposit
referred to in the following clause (i), and the provisions of the Indenture
with respect to the Debt Securities of such series shall no longer be in effect
except as to certain obligations, such as the obligation to register the
transfer or exchange of such outstanding Debt Securities of such series, to
replace mutilated, destroyed, lost or stolen certificates, rights of Holders of
the Debt Securities of such series to receive principal and interest on the
original stated due dates or specified redemption dates, rights of Holders to
receive any sinking fund payments, and any rights to convert or exchange the
Debt Securities of such series, subject to the following conditions: (i) the
Company shall have irrevocably deposited or caused to be deposited with the
Trustee as trust funds in trust specifically pledged as security for, and
dedicated solely to, the benefit of the Holders of the Debt Securities of such
series cash or (in the case of any series of Debt Securities the payments on
which may only be made in legal coin or currency of the United States) U.S.
Government Obligations (or a combination thereof) certified to be sufficient, in
the opinion of a nationally recognized firm of independent public accountants
expressed in a written certification thereof delivered to the Trustee, to pay
(A) the principal and interest and premium, if any, on all Debt Securities of
such series on each date that such principal, interest or premium, if any, is
due and payable or on any Redemption Date established pursuant to clause (iii)
below, and (B) any mandatory sinking fund payments on the dates on which such
payments are due and payable in accordance with the terms of the Indenture and
the Debt Securities of such series; (ii) the Company shall have delivered to the
Trustee an Opinion of Counsel based on the fact that (A) the Company 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
confirming that, the Holders of the Debt Securities of such series will not
recognize income, gain or loss for federal income tax purposes as a result of
such deposit, defeasance and discharge and will be subject to federal income tax
on the same amount and in the same manner and at the same times, as would have
been the case if such deposit, defeasance and discharge had not occurred; (iii)
if the Debt Securities are to be redeemed prior to their Stated Maturity (other
than from mandatory sinking fund payments or analogous payments), notice of such
redemption shall have been duly given pursuant to the Indenture or provision
therefor satisfactory to the Trustee shall have been made; (iv) no Event of
Default or event which with notice or lapse of time or both would become an
Event of Default shall have occurred and be continuing on the date of such
deposit; (v) such defeasance shall not cause the Trustee to have a conflicting
interest within the meaning of the Trust Indenture Act (assuming all Debt
Securities are in default within the meaning of such Act); (vi) such defeasance
shall not result in a breach or violation of, or constitute a default under, any
other agreement or instrument to which the Company is a party or by which it is
bound; (vii) such defeasance shall not result in the trust arising from such
deposit constituting an investment company within the meaning of the Investment
Company Act of 1940, as amended, unless such trust shall be registered under
such Act or exempt from registration thereunder; and (viii) the Company's
delivery to the Trustee of an Officer's Certificate and an Opinion of Counsel,
each stating that the conditions precedent under the Indenture relating to
defeasance have been complied with.

                                       15
<PAGE>   39

     Under each Indenture, the Company also may discharge certain of its
obligations under the Indenture including its obligations referred to above
under "-- Consolidation, Merger and Sale of Assets" and, in the case of the
Senior Indenture, under the covenants described below under "-- Provisions
Applicable Solely to Senior Debt Securities," as well as certain of its
obligations relating to reporting obligations under the Indenture, in respect of
any series of Debt Securities on the 91st day following the deposit referred to
in clause (i) in the immediately preceding paragraph, subject to satisfaction of
the conditions described in clauses (i) and (iii) through (viii) in the
immediately preceding paragraph with respect to such series of Debt Securities
and the delivery of an Opinion of Counsel confirming that the Holders of the
Debt Securities will not recognize income, gain or loss for federal income tax
purposes as a result of such deposit and covenant defeasance and will be subject
to federal income tax on the same amount and in the same manner and at the same
times, as would have been the case if such deposit and covenant defeasance had
not occurred.

     Changes in Control and Highly Leveraged Transactions. Unless otherwise set
forth in a Prospectus Supplement, the Subordinated Indenture will not contain,
and, other than the limitations on Liens and the restriction on Sale-Leaseback
Transactions described below under "-- Provisions Applicable Solely to Senior
Debt Securities," the Senior Indenture does not contain, any covenant or other
provisions designed to afford Holders of the Debt Securities issued thereunder
protection in the event of a change in control of the Company or any of its
affiliates or a highly leveraged transaction involving the Company.

     Modification of the Indentures. Each Indenture provides that the Company
and the Trustee may enter into supplemental indentures without the consent of
the Holders of Debt Securities issued thereunder to: (a) secure any of such Debt
Securities; (b) evidence the succession of another Person to the Company under
the Indenture and the Debt Securities and the assumption by such successor
Person of the obligations of the Company thereunder; (c) add covenants and
Events of Default for the benefit of the Holders of all or any series of such
Debt Securities or to surrender any right or power conferred by the Indenture
upon the Company; (d) add to, change or eliminate any of the provisions of the
Indenture, provided that any such addition, change or elimination shall become
effective only after there are no such Debt Securities of any series entitled to
the benefit of such provision outstanding; (e) establish the forms or terms of
the Debt Securities of any series issued thereunder; (f) cure any ambiguity or
correct any inconsistency in the Indenture; (g) evidence the acceptance of
appointment by a successor Trustee; (h) qualify the Indenture under the Trust
Indenture Act; (i) provide for uncertificated securities in addition to
certificated securities; (j) supplement any provisions of the Indenture
necessary to permit or facilitate the defeasance and discharge of any series of
Debt Securities, provided that such action does not adversely affect the
interests of the Holders of the Debt Securities of such series or any other
series; and (k) comply with the rules or regulations of any securities exchange
or automated quotation system on which any of the Debt Securities may be listed
or traded.

     Each Indenture also contains provisions permitting the Company and the
Trustee, with the consent of the Holders of not less than a majority in
aggregate principal amount of all outstanding Debt Securities affected by such
supplemental indenture (voting as one class) to add any provisions to, or change
in any manner or eliminate any of the provisions of, the Indenture, or modify in
any manner the rights of the Holders of such Debt Securities; provided that the
Company and the Trustee may not, without the consent of the Holder of each
outstanding Debt Security affected thereby, (a) change the stated maturity of
the principal of or any installment of principal of or interest, if any, on, any
Debt Security, or reduce the principal amount thereof or premium, if any, on or
the rate of interest thereon or alter the method of computation of interest, (b)
reduce the percentage in principal amount of Debt Securities required for any
such supplemental Indenture or for any waiver provided for in the Indenture, (c)
change the Company's obligation to maintain an office or agency for payment of
Debt Securities and the other matters specified therein, (d) impair the right to
institute suit for the enforcement of any payment of principal of, premium, if
any, or interest on, any Debt Security or (e) modify any of the provisions of
the Indenture relating to the execution of supplemental indentures with the
consent of Holders of Debt Securities which are discussed in this paragraph or
modify any provisions relating to the waiver by Holders of past defaults and
certain covenants, except to increase any required percentage or to provide that
certain other provisions of the Indenture cannot be modified or waived without
the consent of the Holder of each outstanding Debt Security affected thereby.

                                       16
<PAGE>   40

     Each Indenture provides that a supplemental indenture which changes or
eliminates any covenant or other provision of the Indenture which has expressly
been included solely for the benefit of one or more particular series of Debt
Securities, or which modifies the rights of the Holders of Debt Securities of
such series with respect to such covenant or other provision, shall be deemed
not to affect the rights under the Indenture of the Holders of Debt Securities
of any other series.

     Non-Recourse to the General Partner and Lakehead: No Personal Liability of
Officers, Directors, Employees or Partners. Each Indenture provides that
obligations of the Company under the Indenture and the Debt Securities
thereunder will be non-recourse to the General Partner and Lakehead and their
respective affiliates (other than the Company), and payable only out of cash
flow and assets of the Company. The Trustee, and each Holder of a Debt Security
by its acceptance thereof, will be deemed to have agreed in the applicable
Indenture that (a) neither the General Partner nor its assets nor Lakehead nor
its assets (nor any of their respective affiliates other than the Company, nor
their respective assets) shall be liable for any of the obligations of the
Company under such Indenture or such Debt Securities, and (b) no director,
officer, employee, stockholder or unitholder, as such, of the Company, the
Trustee, the General Partner, Lakehead or any affiliate of any of the foregoing
entities shall have any personal liability in respect of the obligations of the
Company under such Indenture or such Debt Securities by reason of his, her or
its status. Notwithstanding the foregoing, nothing in this Section shall be
construed to modify or supersede any obligation of Lakehead or the General
Partner to restore any negative balance in their respective capital accounts
(maintained by the Company pursuant to the Company's Amended and Restated
Agreement of Limited Partnership) upon liquidation of their respective interests
in the Company.

     Applicable Law. The Indentures are, and the Debt Securities offered hereby
will be, governed by, and construed in accordance with, the laws of the State of
New York.

     Concerning the Trustee. Each Indenture provides that, except during the
continuance of an Event of Default, the Trustee thereunder will perform only
such duties as are specifically set forth in the Indenture. If an Event of
Default has occurred and is continuing, the Trustee will use the same degree of
care and skill in its exercise of the rights and powers vested in it by the
Indenture as a prudent person would exercise or use under the circumstances in
the conduct of such person's own affairs.

     Each Indenture contains limitations on the rights of the Trustee, should it
become a creditor of the Company, to obtain payment of claims in certain cases
or to realize on certain property received by it in respect of such claims, as
security or otherwise. The Trustee is permitted to engage in other transactions;
provided, however, that if it acquires any conflicting interest, it must
eliminate such conflict or resign.

     The Chase Manhattan Bank, a New York banking corporation, is the Trustee
under the Indentures. The Chase Manhattan Bank has lending relationships with
IPL Energy and its affiliates.

PROVISIONS APPLICABLE SOLELY TO SENIOR DEBT SECURITIES

     General. The Senior Debt Securities will be unsecured obligations of the
Company, and will constitute Senior Indebtedness (in each case as defined in the
applicable supplemental Indenture) ranking on a parity with all other unsecured
and unsubordinated indebtedness of the Company and senior to any subordinated
indebtedness of the Company (including the Subordinated Debt Securities).

     Limitations on Liens. The Senior Indenture provides that the Company will
not, nor will it permit any Restricted Subsidiary (as defined below) to, create,
assume, incur or suffer to exist any Lien (as defined below) upon any Principal
Property (as defined below) or upon any shares of capital stock of any
Restricted Subsidiary, whether owned or leased on the date of the Senior
Indenture or thereafter acquired, to secure any Debt (as defined below) of the
Company or any other Person (as defined below) (other than the Senior Debt
Securities issued thereunder), without in any such case making effective
provision whereby all of the Senior Debt Securities Outstanding thereunder shall
be secured equally and ratably with, or prior to, such Debt so long as such Debt
shall be so secured. There is excluded from this restriction:

          (i) any Lien upon any property or assets of the Company or any
     Restricted Subsidiary in existence on the Issue Date or created pursuant to
     an "after-acquired property" clause or similar term in existence
                                       17
<PAGE>   41

     on the Issue Date or any mortgage, pledge agreement, security agreement or
     other similar instrument in existence on the Issue Date;

          (ii) any Lien upon any property or assets created at the time of
     acquisition of such property or assets by the Company or any Restricted
     Subsidiary or within one year after such time to secure all or a portion of
     the purchase price for such property or assets or Debt incurred to finance
     such purchase price, whether such Debt was incurred prior to, at the time
     of or within one year of such acquisition;

          (iii) any Lien upon any property or assets existing thereon at the
     time of the acquisition thereof by the Company or any Restricted Subsidiary
     (whether or not the obligations secured thereby are assumed by the Company
     or any Restricted Subsidiary); provided, however, that such Lien only
     encumbers the property or assets so acquired;

          (iv) any Lien upon any property or assets of a Person existing thereon
     at the time such Person becomes a Restricted Subsidiary by acquisition,
     merger or otherwise; provided, however, that such Lien only encumbers the
     property or assets of such Person at the time such Person becomes a
     Restricted Subsidiary;

          (v) the assumption by the Company or any Restricted Subsidiary of
     obligations secured by any Lien existing at the time of the acquisition by
     the Company or any Restricted Subsidiary of the property or assets subject
     to such Lien or at the time of the acquisition of the Person which owns
     such property or assets;

          (vi) any Lien upon any property or assets to secure all or part of the
     cost of construction, development, repair or improvements thereon or to
     secure Debt incurred prior to, at the time of, or within one year after
     completion of such construction, development, repair or improvements or the
     commencement of full operations thereof (whichever is later), to provide
     funds for any such purpose;

          (vii) any Lien in favor of the Company or any Restricted Subsidiary;

          (viii) any Lien created or assumed by the Company or any Restricted
     Subsidiary in connection with the issuance of Debt the interest on which is
     excludable from gross income of the Holder of such Debt pursuant to the
     Internal Revenue Code of 1986, as amended, or any successor statute, for
     the purpose of financing, in whole or in part, the acquisition or
     construction of property or assets to be used by the Company or any
     Subsidiary;

          (ix) Permitted Liens (as defined below);

          (x) any Lien upon any additions, improvements, replacements, repairs,
     fixtures, appurtenances or component parts thereof attaching to or required
     to be attached to property or assets pursuant to the terms of any mortgage,
     pledge agreement, security agreement or other similar instrument, creating
     a Lien upon such property or assets permitted by clauses (i) through (ix),
     inclusive, above; or

          (xi) any extension, renewal, refinancing, refunding or replacement (or
     successive extensions, renewals, refinancing, refundings or replacements)
     of any Lien, in whole or in part, that is referred to in clauses (i)
     through (x), inclusive, above, or of any Debt secured thereby; provided,
     however, that the principal amount of Debt secured thereby shall not exceed
     the greater of (A) the principal amount of Debt so secured at the time of
     such extension, renewal, refinancing, refunding or replacement (plus the
     aggregate amount of premiums, other payments, costs and expenses required
     to be paid or incurred in connection with such extension, renewal,
     refinancing, refunding or replacement) and (B) the maximum committed
     principal amount of Debt so secured at such time; provided further,
     however, that such extension, renewal, refinancing, refunding or
     replacement shall be limited to all or a part of the property (including
     improvements, alterations and repairs on such property) subject to the
     encumbrance so extended, renewed, refinanced, refunded or replaced (plus
     improvements, alterations and repairs on such property).

     Notwithstanding the foregoing, under the Senior Indenture, the Company may,
and may permit any Restricted Subsidiary to, create, assume, incur, or suffer to
exist any Lien upon any Principal Property to
                                       18
<PAGE>   42

secure Debt of the Company or any Person (other than the Senior Debt Securities)
that is not excepted by clauses (i) through (xi), inclusive, above without
securing the Senior Debt Securities issued under the Senior Indenture, provided
that the aggregate principal amount of all Debt then outstanding secured by such
Lien and all similar Liens, together with all net sale proceeds from
Sale-Leaseback Transactions (as defined below) (excluding Sale-Leaseback
Transactions permitted by clauses (i) through (iv), inclusive, of the first
paragraph of the restriction on sale-leasebacks covenant described below) does
not exceed 10% of Consolidated Net Tangible Assets (as defined below).

     Restriction on Sale-Leasebacks. The Senior Indenture provides that the
Company will not, and will not permit any Restricted Subsidiary to, engage in a
Sale-Leaseback Transaction, unless: (i) such Sale-Leaseback Transaction occurs
within one year from the date of acquisition of the Principal Property subject
thereto or the date of the completion of construction or commencement of full
operations on such Principal Property, whichever is later; (ii) the
Sale-Leaseback Transaction involves a lease for a period, including renewals, of
not more than three years; (iii) the Company or such Restricted Subsidiary would
be entitled to incur Debt secured by a Lien on the Principal Property subject
thereto in a principal amount equal to or exceeding the net sale proceeds from
such Sale-Leaseback Transaction without equally and ratably securing the Senior
Debt Securities; or (iv) the Company or such Restricted Subsidiary, within a
one-year period after such Sale-Leaseback Transaction, applies or causes to be
applied an amount not less than the net sale proceeds from such Sale-Leaseback
Transaction to (A) the prepayment, repayment, redemption or retirement of Funded
Debt (as defined below) of the Company or any Subsidiary, or (B) investment in
another Principal Property.

     Notwithstanding the foregoing, under the Senior Indenture the Company may,
and may permit any Restricted Subsidiary to, effect any Sale-Leaseback
Transaction that is not excepted by clauses (i) through (iv), inclusive, of the
above paragraph, provided that the net sale proceeds from such Sale-Leaseback
Transaction, together with the aggregate principal amount of outstanding Debt
(other than the Senior Debt Securities) secured by Liens upon Principal
Properties not excepted by clauses (i) through (xi), inclusive, of the first
paragraph of the limitation on liens covenant described above, do not exceed 10%
of the Consolidated Net Tangible Assets.

     Certain Defined Terms. As used herein:

     "Consolidated Net Tangible Assets" means, at any date of determination, the
total amount of assets after deducting therefrom (i) all current liabilities
(excluding (A) any current liabilities that by their terms are extendable or
renewable at the option of the obligor thereon to a time more than 12 months
after the time as of which the amount thereof is being computed, and (B) current
maturities of long-term debt), and (ii) the value (net of any applicable
reserves) of all goodwill, trade names, trademarks, patents and other like
intangible assets, all as set forth on the consolidated balance sheet of the
Company and its consolidated subsidiaries for the Company's most recently
completed fiscal quarter, prepared in accordance with generally accepted
accounting principles.

     "Debt" means any obligation created or assumed by any Person for the
repayment of money borrowed, any purchase money obligation created or assumed by
such Person and any guarantee of the foregoing.

     "Funded Debt" means all Debt maturing one year or more from the date of the
creation thereof, all Debt directly or indirectly renewable or extendible, at
the option of the debtor, by its terms or by the terms of any instrument or
agreement relating thereto, to a date one year or more from the date of the
creation thereof, and all Debt under a revolving credit or similar agreement
obligating the lender or lenders to extend credit over a period of one year or
more.

     "Issue Date" means the date on which Debt Securities are initially issued
under the Indentures.

     "Lien" means, as to any entity, any mortgage, lien, pledge, security
interest or other encumbrance in or on, or adverse interest or title of any
vendor, lessor, lender or other secured party to or of the entity under
conditional sale or other title retention agreement or capital lease with
respect to, any property or asset of the entity.

                                       19
<PAGE>   43

     "Permitted Liens" means (i) Liens upon rights-of-way for pipeline purposes;
(ii) any statutory or governmental Lien, mechanics', materialmen's, carriers' or
similar Lien incurred in the ordinary course of business which is not yet due or
which is being contested in good faith by appropriate proceedings and any
undetermined Lien which is incidental to construction; (iii) the right reserved
to, or vested in, any municipality or public authority by the terms of any
right, power, franchise, grant, license, permit or by any provision of law, to
purchase or recapture or to designate a purchaser of, any property; (iv) Liens
of taxes and assessments which are (A) for the then current year, (B) not at the
time delinquent, or (C) delinquent but the validity of which is being contested
at the time by the Company or any Restricted Subsidiary in good faith; (v) Liens
of, or to secure performance of, leases, other than capital leases; (vi) any
Lien upon, or deposits of, any assets in favor of any surety company or clerk of
court for the purpose of obtaining indemnity or stay of judicial proceedings;
(vii) any Lien upon property or assets acquired or sold by the Company or any
Restricted Subsidiary resulting from the exercise of any rights arising out of
defaults on receivables; (viii) any Lien incurred in the ordinary course of
business in connection with workmen's compensation, unemployment insurance,
temporary disability, social security, retiree health or similar laws or
regulations or to secure obligations imposed by statute or governmental
regulations; (ix) any Lien upon any property or assets in accordance with
customary banking practice to secure any Debt incurred by the Company or any
Restricted Subsidiary in connection with the exporting of goods to, or between,
or the marketing of goods in, or the importing of goods from, foreign countries;
(x) any Lien in favor of the United States of America or any state thereof, or
any other country, or any political subdivision of any of the foregoing, to
secure partial, progress, advance, or other payments pursuant to any contract or
statute, or any Lien securing industrial development, pollution control, or
similar revenue bonds; or (xi) any easements, exceptions or reservations in any
property of the Company or any Subsidiary granted or reserved for the purpose of
pipelines, roads, the removal of oil, gas, coal or other minerals, and other
like purposes, or for the joint or common use of real property, facilities and
equipment, which are incidental to, and do not materially interfere with, the
ordinary conduct of its business or the business of the Company and its
Subsidiaries, taken as a whole.

     "Person" means any individual, corporation, partnership, joint venture,
limited liability company, association, joint-stock company, trust, other
entity, unincorporated organization or government, or any agency or political
subdivision thereof.

     "Principal Property" means (a) any pipeline assets of the Company or any
Restricted Subsidiary, including any related facilities employed in the
transportation, terminalling or storage of crude oil or natural gas liquids,
that are located in the United States or Canada and (b) any processing or
manufacturing plant or terminal owned or leased by the Company or any Subsidiary
that is located within the United States or Canada, except, in the case of
either clause (a) or (b), (i) any assets consisting of inventories, furniture,
office fixtures and equipment (including data processing equipment), vehicles
and equipment used on, or useful with, vehicles, and (ii) any such assets, plant
or terminal which, in the opinion of the Board of Directors, is not material in
relation to the activities of the Company and its Subsidiaries, taken as a
whole.

     "Restricted Subsidiary" means any Subsidiary of the Company owning or
leasing any Principal Property.

     "Sale-Leaseback Transaction" means the sale or transfer by the Company or
any Restricted Subsidiary of any Principal Property to a Person (other than the
Company or a Restricted Subsidiary) and the taking back by the Company or any
Restricted Subsidiary, as the case may be, of a lease of such Principal
Property.

     "Subsidiary" means, with respect to any Person, (i) any corporation,
association or other business entity of which more than 50% of the total voting
power of shares of capital stock entitled (without regard to the occurrence of
any contingency) to vote in the election of directors, managers or trustees
thereof is at the time owned or controlled, directly or indirectly, by such
Person and (ii) any partnership (a) the sole general partner or the managing
general partner of which is such Person or an entity described in clause (i) and
related to such Person, (b) the only general partners of which are such Person
or of one or more entities described in clause (i) and related to such Person
(or any combination thereof) or (c) as to which such Person, or an entity
described in clause (i) and related to such Person, has the right to receive
more than 50% of the distributions of such partnership or has the right in the
event of dissolution to more than 50% of the assets of such partnership.

                                       20
<PAGE>   44

PROVISIONS APPLICABLE SOLELY TO SUBORDINATED DEBT SECURITIES

     General. The Subordinated Debt Securities will be unsecured obligations of
the Company, and will be subordinated in right of payment to all Senior Debt (as
defined in the applicable Prospectus Supplement), including the Senior Debt
Securities, of the Company to the extent set forth in the applicable Prospectus
Supplement.

     Subordination. Upon any voluntary or involuntary liquidation or bankruptcy
of the Company, Senior Debt of the Company is entitled to receive payment in
full of all amounts due on such Senior Debt, before Holders of Subordinated Debt
Securities are entitled to receive any payments of amounts due on the
Subordinated Debt Securities.

     Unless otherwise indicated in the applicable Prospectus Supplement, in the
event of payment defaults under, or acceleration of, Senior Debt of the Company,
no payments may be made in respect of the Subordinated Debt Securities until
such Senior Debt has been paid in full or any payment default thereunder has
been cured or waived. Failure to make required payments on the Subordinated Debt
Securities would constitute an Event of Default under the Subordinated Indenture
with respect thereto.

     Unless otherwise indicated in the applicable Prospectus Supplement, if any
default occurs (other than a default described in the preceding paragraph) under
the Senior Debt of the Company, pursuant to which the maturity thereof may be
accelerated immediately or at the expiration of any applicable grace periods (a
"Senior Nonmonetary Default"), then, upon the receipt by the Company and the
Trustee of written notice thereof (a "Payment Blockage Notice") from or on
behalf of Holders of such Senior Debt specifying an election to prohibit such
payment by the Company in accordance with the following provisions of this
paragraph, the Company may not make any payment that would be prohibited by the
immediately preceding paragraph during the period (the "Payment Blockage
Period") commencing on the date of receipt of such Payment Blockage Notice and
ending on the earlier of (i) the date, if any, on which the Holders of such
Senior Debt or their representative notifies the Trustee that such Senior
Nonmonetary Default is cured or waived or ceases to exist or the Senior Debt to
which such Senior Nonmonetary Default relates is discharged or (ii) the 179th
day after the date of receipt of such Payment Blockage Notice. Notwithstanding
the provisions described in the immediately preceding sentence, the Company may
resume payments on the Subordinated Debt Securities after such Payment Blockage
Period.

                              PLAN OF DISTRIBUTION

     The Company may offer or sell the Debt Securities to or through one or more
underwriters, dealers or agents as designated from time to time, or through a
combination of such methods and also may offer or sell the Debt Securities
directly to one or more other purchasers. The Company may sell the Debt
Securities as soon as practicable after effectiveness of the Registration
Statement of which this Prospectus is a part.

     A Prospectus Supplement will set forth the terms of the offering of the
particular series of Debt Securities offered thereby, including: (i) the name or
names of any underwriters or agents; (ii) the name or names of any managing
underwriter or underwriters; (iii) the initial public offering or purchase price
of such series of Debt Securities; (iv) any underwriting discounts, commissions,
and other items constituting underwriters' compensation and any other discount,
concessions, or commissions allowed or reallowed or paid by any underwriters to
other dealers; (v) any commissions paid to any agents; (vi) the net proceeds to
the Company from the sales; and (vii) any securities exchanges or markets on
which such series of Debt Securities may be listed.

     Unless otherwise set forth in the Prospectus Supplement relating to a
particular series of Debt Securities, the obligations of the underwriters to
purchase such series of Debt Securities will be subject to certain conditions
precedent and each of the underwriters with respect to such series of Debt
Securities will be obligated to purchase all of the Debt Securities of such
series allocated to it if any such Debt Securities are purchased. Any initial
public offering price and any discounts or concessions allowed, reallowed, or
paid to dealers may be changed from time to time.

                                       21
<PAGE>   45

     The Debt Securities may be offered and sold by the Company directly or
through agents designated by the Company from time to time. Unless otherwise
indicated in the related Prospectus Supplement, each such agent will be acting
on a best efforts basis for the period of its appointment. Any agent
participating in the distribution of Debt Securities may be deemed to be an
"underwriter," as that term is defined in the Securities Act, of the Debt
Securities so offered and sold. The Debt Securities also may be sold to dealers
at the applicable price to the public set forth in the Prospectus Supplement
relating to such series of Debt Securities. Such dealers may be deemed to be
"underwriters" within the meaning of the Securities Act. Underwriters, dealers
and agents may be entitled, under agreements entered into with the Company, to
indemnification by the Company against certain civil liabilities, including
liabilities under the Securities Act.

     Underwriters, dealers and agents may engage in transactions with, or
perform services for, or be customers of, the Company in the ordinary course of
business.

     All Debt Securities offered will be a new issue of securities with no
established trading market. Any underwriter to whom Debt Securities are sold by
the Company for public offering and sale may make a market in such Debt
Securities, but such underwriters will not be obligated to do so and may
discontinue any market making at any time without notice. The Debt Securities of
any series may or may not be listed on a national securities exchange or a
foreign securities exchange. No assurance can be given as to the liquidity of or
the trading markets for the Debt Securities.

     In connection with the offering, the underwriters or agents, as the case
may be, may purchase and sell the Debt Securities in the open market. These
transaction may include over-allotment and stabilizing transactions and
purchases to cover syndicate short positions created in connection with the
offering. Stabilizing transactions consist of certain bids or purchases for the
purpose of preventing or retarding a decline in the market price of the Debt
Securities; and syndicate short positions involve the sale by the underwriters
or agents, as the case may be, of a greater number of Debt Securities than they
are required to purchase from the Company in the offering. The underwriters also
may impose a penalty bid, whereby selling concessions allowed to syndicate
members or other broker dealers in respect of the Debt Securities sold in the
offering for their account may be reclaimed by the syndicate if such Debt
Securities are repurchased by the syndicate in stabilizing or covering
transactions. These activities may stabilize, maintain or otherwise affect the
market price of the Debt Securities, which may be higher than the price that
might otherwise prevail in the open market, and these activities, if commenced,
may be discontinued at any time.

                                 LEGAL MATTERS

     Certain legal matters in connection with the Debt Securities offered hereby
will be passed upon for the Company by Andrews & Kurth L.L.P., Houston, Texas.
If the Debt Securities are being distributed in an underwritten offering,
certain legal matters will be passed upon for the underwriters by counsel
identified in the related Prospectus Supplement.

                                    EXPERTS

     The consolidated financial statements incorporated in this Prospectus by
reference to the Annual Report on Form 10-K of Lakehead Pipe Line Partners, L.P.
for the year ended December 31, 1997, as amended by the Annual Report on Form
10-K/A of Lakehead Pipe Line Partners, L.P. for the year ended December 31,
1997, and the audited balance sheet of Lakehead Pipe Line Company, Inc. as of
December 31, 1997 and 1996, incorporated in this Prospectus by reference to the
Current Report on Form 8-K of Lakehead Pipe Line Partners, L.P. dated July 21,
1998, as amended by the Current Report on Form 8-K/A of Lakehead Pipe Line
Partners, L.P. dated September 14, 1998, have been so incorporated in reliance
on the report of PricewaterhouseCoopers LLP, independent accountants, given on
the authority of said firm as experts in auditing and accounting.

                                       22
<PAGE>   46

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                                  $100,000,000

                          LAKEHEAD PIPE LINE COMPANY,
                              LIMITED PARTNERSHIP

                           7.9% SENIOR NOTES DUE 2012

                       ----------------------------------

                             PROSPECTUS SUPPLEMENT
                       ----------------------------------

                              MERRILL LYNCH & CO.

                             ABN AMRO INCORPORATED

                         BANC OF AMERICA SECURITIES LLC

                             CHASE SECURITIES INC.

                               NOVEMBER 16, 2000

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