SPLITROCK SERVICES INC
424B3, 2000-03-23
COMPUTER INTEGRATED SYSTEMS DESIGN
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<PAGE>

                                                Filed Pursuant to Rule 424(b)(3)
                                                      Registration No. 333-63001

PROSPECTUS

                           SPLITROCK SERVICES, INC.

                               138,980 warrants

                             to purchase shares of

                                 common stock

                           792,235 shares of common

                              stock issuable upon

                             exercise of warrants

                                  $11,000,000

                               11 3/4% Series B

                             senior notes due 2008

This prospectus relates to:

     .    an offering to our warrantholders of 792,235 shares of common stock of
          Splitrock Services, Inc., to be issued by us or transferred by Harris
          Trust, as warrant agent, upon the exercise of our outstanding
          warrants;

     .    an offering by various selling securityholders identified in this
          prospectus of 138,980 of our warrants to purchase shares of our common
          stock; and

     .    an offering by Linsang Partners, LLC of an aggregate principal amount
          of $11,000,000 of our Series B senior notes due 2008.

The shares of common stock included in this prospectus are not currently
outstanding and will be issued to the warrantholders upon the proper exercise of
any warrant. Persons who properly exercise the warrants will receive common
stock without any restriction on the resale of those shares. We may issue
additional shares under anti-dilution provisions of the warrants. The selling
securityholders will offer the warrants and the senior notes from time to time
at prevailing market prices. We will not receive any of the proceeds from the
sale of the warrants or senior notes by the selling securityholders.

Our common stock trades on the Nasdaq Stock Market under the symbol "SPLT."
There is currently no public market for our warrants and senior notes and we do
not intend to list them on any securities exchange or to seek approval for
quotation through any exchange or automated quotation system.

See "Risk Factors" beginning on page 8 to read about certain risks that you
should consider before buying our securities.

Neither the Securities and Exchange Commission nor any other regulatory body has
approved or disapproved these securities or passed upon the adequacy or accuracy
of this prospectus. Any representation to the contrary is a criminal offense.

                 The date of this prospectus is March 23, 2000
<PAGE>

     You should rely only on the information contained in this prospectus. We
have not authorized anyone to provide you with information different from that
contained in this prospectus. The information contained in this prospectus is
accurate only as of the date of this prospectus, regardless of the time of
delivery of this prospectus or of any sale of our securities. Neither the
delivery of this prospectus nor any offer or sale made hereunder shall under any
circumstances create any implication that the information contained herein is
correct as of any date subsequent to the date hereof.


                               TABLE OF CONTENTS
                             _____________________

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                                                                                                 Page
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Where You Can Find More Information.........................................................      2
Incorporation of Certain Information by Reference...........................................      2
Prospectus Summary..........................................................................      4
Risk Factors................................................................................      8
Use of Proceeds.............................................................................     23
Selling Holders.............................................................................     24
Plan of Distribution........................................................................     25
Description of the Warrants.................................................................     26
Description of the Notes....................................................................     31
Material United States Federal Income Tax Considerations....................................     65
Legal Matters...............................................................................     68
Experts.....................................................................................     66
</TABLE>


                           FORWARD-LOOKING STATEMENTS

     This prospectus includes forward-looking statements. Words such as
"anticipates," "plans," "estimates," "expects," "believes," and
similar expressions as used in this prospectus in connection with Splitrock or
our management, are intended to identify forward-looking statements. We have
based these forward-looking statements on our current expectations and
projections about future events. However, our actual results, performance, or
achievements may materially differ from those expressed in the forward-looking
statements. Please see "Risk Factors" for a more detailed description of those
conditions and events that could cause our results to differ.

     We undertake no obligation publicly to update or revise any forward-looking
statements, whether as a result of new information, future events or otherwise.
In light of these risks, uncertainties and assumptions, the forward-looking
events discussed in this offering memorandum might not occur.
<PAGE>

                      WHERE YOU CAN FIND MORE INFORMATION

  We have filed with the Securities and Exchange Commission a registration
statement on Form S-1 under the Securities Act of 1933 with respect to the
securities offered by this prospectus. This prospectus does not contain all of
the information set forth in the registration statement and its exhibits and
schedules. Particular items are omitted in accordance with the rules and
regulations of the Securities and Exchange Commission. For further information
about our company and the securities offered by this prospectus, we refer you to
the registration statement, including its exhibits and schedules. You may read
and copy the registration statement at the Securities and Exchange Commission's
following locations:

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     <S>                         <C>                          <C>
     Public Reference Room       New York Regional Office     Chicago Regional Office
     Room 1024                   Seven World Trade Center     Citicorp Center
     450 Fifth Street, N.W.      Suite 1300                   500 West Madison Street
     Washington, DC 20549        New York, NY 10048           Suite 1400
                                                              Chicago, IL 60661-2511
</TABLE>

  You may also obtain copies of the registration statement by mail from the
Public Reference Section of the Securities and Exchange Commission at 450 Fifth
Street, N.W., Judiciary Plaza, Washington, D.C. 20549 or by telephone at 1-800-
SEC-0330. The registration statement is also available to the public from
commercial document retrieval services and at the Securities and Exchange
Commission's World Wide Web site located at http://www.sec.gov. You can also
read our filings with the Securities and Exchange Commission at the office of
Nasdaq Operations, 1734 K Street, N.W. Washington, DC 20006.

  Statements in this prospectus as to the contents of any contract or other
document are not necessarily complete, and in each instance we refer you to the
full text of such contract or document filed as an exhibit to the registration
statement, each such statement being qualified in all respects by such
reference.

  We intend to furnish our stockholders with annual reports containing financial
statements audited by an independent public accounting firm and make available
to our stockholders quarterly reports for the first three quarters of each
fiscal year containing interim unaudited financial information.


                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

  The following documents previously filed by Splitrock with the Commission
under the Securities and the Exchange Act (File No. 0-26827) are incorporated
herein by reference:

          (a)  Splitrock's Registration Statement on Form S-1 (File No. 333-
               79909), as amended, dated August 2, 1999;

          (b)  Splitrock's Annual Report on Form 10-K for the fiscal year ended
               December 31, 1998; and

          (c)  Splitrock's Quarterly Reports on Form 10-Q for the quarters ended
               March 31, June 30 and September 30, 1999;

          (d)  Splitrock's Proxy Statement included in the Registration
               Statement on Form S-4 filed by McLeodUSA, Inc. (File No.
               333-95941), dated February 14, 2000, as amended;

          (e)  Splitrock's current reports on Form 8-K, dated January 6, 2000,
               February 11, 2000, and February 16, 2000.

  All documents filed by Splitrock pursuant to Section 13(a), 13(c), 14 or 15(d)
of the Exchange Act prior to the termination of the offering of the Securities
made hereby, shall be deemed to be incorporated by reference into this
Prospectus and to be a part hereof from the date of filing of such documents.

                                       2
<PAGE>

  Any statement contained in a document incorporated or deemed to be
incorporated by reference herein shall be deemed to be modified or superseded
for purposes hereof to the extent that a statement contained herein (or in any
other subsequently filed document that is or is deemed to be incorporated by
reference herein) modifies or supersedes such previous statement. Any statement
so modified or superseded shall not be deemed to constitute a part hereof except
as so modified or superseded.

  Splitrock will provide without charge to each person to whom a copy of this
Prospectus has been delivered, on the written or oral request of such person, a
copy of any or all of the documents referred to above which have been or may be
incorporated by reference in this Prospectus other than exhibits to such
documents, unless such exhibits are also specifically incorporated by reference
herein. Requests for such copies should be directed to Splitrock.

                                       3
<PAGE>

                              PROSPECTUS SUMMARY

  This summary highlights some of the information in this prospectus. The
summary may not contain all of the information that is important to you. This
prospectus includes forward-looking statements which involve risks and
uncertainties. You should carefully read the entire prospectus, including the
risk factors and the financial statements, before deciding whether to invest in
our securities.

                                 The Offering

  The following is a brief summary of the terms of this offering. For a more
complete description of the securities offered by this prospectus, see
"Description of the Warrants," "Description of Capital Stock" and
"Description of the Notes."

                                 The Warrants

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Issuer                           Splitrock Services, Inc.

Warrants Offered...............  138,980 warrants which, when exercised, will entitle the holders to acquire an
                                 aggregate of 792,235 shares of our common stock. We refer to the shares of our
                                 common stock and any other securities issuable or deliverable upon exercise of
                                 the warrants as the "warrant shares."

Exercise Price.................  $.02 per share of common stock.  The exercise price will be eliminated when
                                 Splitrock issues the warrant shares to the warrant agent to hold in custody
                                 pursuant to the first supplemental warrant agreement.  See "Description of the
                                 Warrants."

Manner of Exercise.............  Until the warrant shares are issued to the warrant agent, the holders may
                                 exercise the warrants by providing the exercise price to us in cash or by
                                 cashless exercise whereby the aggregate value of shares issued to the holder is
                                 reduced by the exercise price owed.  Thereafter, the holders may exercise their
                                 warrants without tendering any exercise price.

Expiration.....................  The warrants are currently exercisable and will expire on July 15, 2008.

Anti-Dilution Provisions.......  The warrants have customary anti-dilution provisions.

Voting Rights..................  After the warrant shares have been issued to the warrant agent, the warrant
                                 holders may instruct the warrant agent how to vote the shares underlying their
                                 warrants in any vote taken by holders of our common stock.

Warrant Shares.................  The warrants entitle the holders to acquire shares of our common stock.
                                 Splitrock shall issue the warrant shares to the warrant agent to hold in custody
                                 on behalf of the warrant holders until they exercise their warrants.  For
                                 additional information regarding the warrants and the warrant shares, see
                                 "Description of the Warrants" and "Description of Capital Stock."

Warrant Agent..................  Harris Trust Company of New York.

                                                        The Warrant Shares

Issuer.........................  Splitrock Services, Inc.

Common stock offered by us or
the warrant agent to the
warrantholders upon exercise
of the warrants................  792,235 shares, assuming that all of the
                                 warrants are exercised.

Common stock to be
</TABLE>

                                       4
<PAGE>

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outstanding after this offering. 58,000,655 shares, assuming that all of the warrants are exercised.

Use of proceeds................  We will realize proceeds of approximately $14, 591. We intend to use the net
                                 proceeds from this offering for working capital and other corporate purposes. We
                                 will not receive any proceeds from the subsequent resale of the shares of common
                                 stock by our stockholders.
</TABLE>

  The number of shares of common stock to be outstanding after this offering is
based on the 57,208,420 shares outstanding as of February 29, 2000. The shares
of common stock to be outstanding after this offering excludes:

  .  4,458,468 shares of common stock issuable upon the exercise of outstanding
     options with a weighted average exercise price of $9.05 per share; and

  .  any shares of common stock reserved for issuance upon the exercise of
     options available to be granted under our stock option plans.


                                   The Notes

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<S>                               <C>
Issuer..........................  Splitrock Services, Inc.

Notes Offered...................  $11,000,000 in aggregate principal amount of 11 3/4% Series B Senior Notes due
                                  2008.

Maturity........................  July 15, 2008.

Interest Payment Dates..........  January 15 and July 15 of each year.

Escrow Proceeds.................  As of March 1, 2000 approximately $15.1 million in temporary cash investments remained of the
                                  original $56.8 million we deposited with an escrow agent, that, together with the interest
                                  received on those investments, will be sufficient to pay the semi-annual interest payment on the
                                  Notes due on July 15, 2000. Interest payments due on January 15, 2000 and on January 15 and July
                                  15, 1999 were paid out of the escrow. Any remaining balance will be retained by us. The notes are
                                  collateralized by a first priority and exclusive security interest in this escrow account. See
                                  "Description of the Notes--Disbursement of Funds; Escrow Account."

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

Guarantees......................  Each of our restricted subsidiaries that incurs indebtedness will fully and
                                  unconditionally guarantee the notes on a senior, unsecured basis. See
                                  "Description of the Notes--Certain Covenants--Future Subsidiary Guarantors."
                                  As of March 3, 2000, only one of our three subsidiaries had incurred
                                  indebtedness and therefore guaranteed the notes on a senior, unsecured basis.

Optional Redemption.............  We may redeem some or all of the notes on or after July 15, 2003, at the
                                  redemption prices described in this prospectus. In addition, before July 15,
                                  2001, we may redeem up to 35% of the notes with the net proceeds of a public
                                  equity offering, at a redemption price equal to 111.75% of the principal amount
                                  of the notes, plus accrued and unpaid interest, if at least 65% of the notes
                                  originally issued remain outstanding after such redemption. See "Description of
                                  the Notes--Optional Redemption."

Change of Control...............  Upon certain change of control events, each holder of notes may require us to
                                  repurchase some or all of its notes at a purchase price equal to 101% of their
                                  principal amount, plus accrued and unpaid interest. See "Description of the
                                  Notes--Change of Control."

Ranking.........................  The notes are senior indebtedness and will rank pari passu with all of our
                                  existing and future senior indebtedness and will rank senior to all of our
                                  future subordinated obligations, which must be specifically designated as
                                  subordinate to
</TABLE>

                                       5
<PAGE>

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<S>                               <C>
                                  the notes. The notes are unsecured except for the Trustee's security interest in the escrow
                                  account for the benefit of the holders of the notes and are therefore effectively subordinated to
                                  all of our secured indebtedness. At December 31, 1999, we had $40 million of indebtedness other
                                  than the notes all of which is senior indebtedness and all of which was secured. See "Description
                                  of the Notes--Ranking."



Restrictive Covenants..........  The indenture governing the notes contains covenants that, among other things,
                                 limit our ability and the ability of our restricted subsidiaries to:

                                 .  incur additional indebtedness or liens or enter into sale/leaseback
                                    transactions;

                                 .  pay dividends or make other distributions;

                                 .  make investments;

                                 .  repurchase equity interests or subordinated obligations;

                                 .  consummate asset sales;

                                 .  enter into transactions with affiliates;

                                 .  engage in any business other than a telecommunications business; and

                                 .  merge or consolidate with any other person or sell, assign, transfer, lease,
                                    convey or otherwise dispose of all or substantially all of our assets.

                                 These covenants are subject to important exceptions and qualifications, which
                                 are described under the heading "Description of the Notes" in this prospectus.
</TABLE>


                           Splitrock Services, Inc.

  We were incorporated in Texas on March 5, 1997 and reincorporated in Delaware
on May 8, 1998. Our headquarters are located at 9012 New Trails Drive, The
Woodlands, Texas 77381. Our telephone number at that location is (281) 465-1200.
Our website address is www.splitrock.net. The information contained on our
website is not part of this prospectus. The terms "the Company,"
"Splitrock," "we," "our," and "us," as used in this prospectus refer to
Splitrock Services, Inc.

                                       6
<PAGE>

                                 RISK FACTORS

  You should carefully consider the risks described below before making an
investment decision. The risks and uncertainties described below are not the
only ones facing our company. Additional risks and uncertainties not presently
known to us or that we currently consider immaterial may also impair our
operations. If any of the following risks actually occur, our business,
financial condition or results of operations could be materially adversely
affected. In this case, the trading price, if any, of our securities could
decline, and you may lose all or part of your investment.

  We make many forward-looking statements in this prospectus that are not based
on historical facts, but discuss our future expectations. You can identify these
statements by our use of forward-looking terms, such as "anticipates,"
"believes," "plans," "expects," "future," "intends" and similar
expressions. Because these forward-looking statements involve risks and
uncertainties, there are important factors that may cause our actual results to
differ materially from those expressed or implied in our forward-looking
statements, including those discussed under this section and elsewhere in this
prospectus.


Fluctuations in the price of McLeodUSA Class A common stock may negatively
affect our stock price as a result of the merger agreement.

  The merger agreement provides that each share of Splitrock common stock will
be converted into the right to receive 0.5437 of a share of McLeodUSA Class A
common stock as a result of the merger. Our stock has generally traded at prices
proportional to the price of McLeodUSA common stock since January 7, 2000 in
anticipation of the merger. Changes in the value of McLeodUSA common stock
resulting from operations and market conditions unrelated to Splitrock's
business may affect our stock price because of the merger.


Failure to Consummate the Proposed Merger with McLeodUSA May Adversely Effect
Our Financial Condition

  While more than a majority of our shareholders have signed agreements
obligating them to approve the merger agreement with McLeodUSA, if the
transactions contemplated by that agreement are not consummated, we would not
realize the actual and perceived benefits of the merger which could have a
negative impact on our financial results. We also agreed to pay a
termination fee of $68 million in specified circumstances, including where a
party other than McLeodUSA acquires or seeks to acquire us. Payment of the
termination fee could have an adverse effect on our financial condition. In
addition, because our stock price has traded at prices proportional to the stock
price of McLeodUSA in anticipation of the merger, the failure to consummate the
merger could result in a significant drop in our stock price to the levels at
which our stock traded prior to the announcement of the merger agreement. For
more information on the proposed merger with McLeodUSA, see our proxy statement
included in the Registration Statement on Form S-4 filed by McLeodUSA and
incorporated by reference herein.


Our business is difficult to evaluate because we have a limited operating
history and implementation of our current business plan is not reflected in our
historical financial statements.

  We were incorporated and commenced operations in March 1997. Accordingly, we
have a limited operating history from which you can evaluate our business and
prospects. In addition, we currently derive substantially all of our revenues
from Internet dial access services. We are now significantly expanding our sales
and marketing effort and our service offerings with the expectation of
broadening our customer base. We are also making a substantial capital
investment to acquire exclusive rights to use a fiber optic backbone, and
neither the revenues nor the expenses that may be associated with this
investment are reflected in our historical financial statements. As a result,
not only is our operating history limited, but our historical financial
statements do not reflect important elements of our business plan on a going
forward basis. The combination of these factors may make evaluation of our
business and prospects difficult.

                                       7
<PAGE>

As a participant in a new and rapidly evolving business, we face risks and
uncertainties relating to our ability to successfully implement our business
plan.

  We have developed a business plan in the context of the rapidly evolving data
communications industry that leverages our current service offerings and
technical expertise and expands our operations into new service areas. The risks
and uncertainties associated with implementing our business plan relate to:

  .  expanding our sales and marketing activities;

     expanding and scaling operations support systems for planned services;

  .  providing services to our customers that are reliable and cost-effective;

  .  responding to technological development or service offerings by
     competitors;

  .  acquiring and integrating our fiber backbone into our network;

  .  increasing awareness of our brand;

  .  identifying and integrating strategic acquisitions and alliances; and

  .  attracting and retaining qualified personnel.

If we are unsuccessful in addressing these risks and uncertainties, our
business, results of operations and financial condition will be materially
adversely affected.


We have a history of losses and we expect to continue to incur losses in the
foreseeable future.

  We have incurred net losses and negative cash flows from operations since our
inception and we expect to continue to do so for the foreseeable future.
Starting up our company and building our network has required substantial
capital and other expenditures. As a result, we reported net losses of
approximately $57.8 million and $103.3 million, respectively during the years
ended December 31, 1998 and 1999, and incurred negative cash flows from
operations of approximately $0.7 million and $88.3 million for the same periods.
As of December 31, 1999, we had an accumulated deficit of $171.3 million. We
cannot assure you that we will be able to achieve or sustain revenue growth,
profitability or positive cash flow on either a quarterly or annual basis.


We currently depend on Prodigy for a significant portion of our revenues, and
our revenues could decrease significantly if the usage of Prodigy subscribers
decreases or if Prodigy ceases to be a customer.

  We currently derive a significant portion of our revenues from Prodigy.
Prodigy accounted for 100%, 99% and 85.5% of our revenues for the period from
inception through December 31, 1997, and the years ended December 31, 1998, and
1999, respectively. While we expect revenues from Prodigy to decrease as a
percentage of our total revenues in future periods, we believe that Prodigy will
continue to account for a significant portion of our revenues. The term of our
agreement with Prodigy, as amended, was extended to December 31, 2001. Prodigy
may also terminate our agreement prior to December 31, 2001 if we fail to meet
specified service level objectives or otherwise fail to comply with the
agreement. The loss of Prodigy as a customer would have a material adverse
effect on our business, financial condition and results of operation.

  Effective January 1, 2000, we will receive a fixed hourly fee from Prodigy
based on Prodigy customer usage rather than one calculated from the number of
their subscribers we serve. The effect of this change in pricing was to reduce
January 2000 revenues from Prodigy by 2.9% compared to what it would have been
under the old formula.

  Prodigy operates in a highly competitive environment and competes with a wide
range of national, regional and local Internet service providers. A decrease in
the number of Prodigy subscribers or their usage would likely result

                                       8
<PAGE>

in a corresponding decrease in our revenues under our agreement with Prodigy.
Prodigy's loss of these arrangements and relationships or a decrease in the
number of enrollments it receives as a result of these marketing channels could
adversely affect our results of operations.

  Prodigy's results may be affected by seasonal factors. Historically, the
growth in Prodigy subscribers and their total usage has been higher in the first
and fourth quarters of the calendar year, in part due to increased marketing
efforts and consumer demand during the year-end holiday season. The seasonal
nature of Prodigy's business could affect our quarterly revenues.


We may not be able to hire and retain qualified employees.

  Our future success depends on our ability to attract, train, motivate and
retain highly skilled employees, especially qualified, competent and motivated
sales and marketing staff with contacts and expertise in the communications
sector. Competition for employees in the data communications industry,
especially sales and marketing personnel, is intense and our business plan
depends on hiring a significant number of these individuals. We may be unable to
retain our key employees or attract, assimilate or retain other highly qualified
employees in the future. We have from time to time in the past experienced, and
we expect to continue to experience in the future, difficulty in hiring and
retaining highly skilled employees with appropriate qualifications.


Our quarterly financial results may not be a good indicator of future results
and may fluctuate significantly and could result in lower prices for our stock.

  We expect our quarterly revenues, expenses and operating results to fluctuate
significantly in the future as a result of a variety of factors, some of which
are outside of our control. As a result, we believe that quarter to quarter
comparisons of our operating results are not a good indication of our future
performance and it is possible that our operating results may be below the
expectations of securities analysts or investors in some future period. If the
latter occurs, the trading price of our common stock would likely decline,
perhaps significantly. The factors which affect whether our results fluctuate
include:

  .  the number and level of usage of Prodigy subscribers;

  .  demand for network and Internet access services;

  .  capital expenditures and other costs relating to the construction and
     installation of our network, including the fiber optic backbone;

  .  delays in the construction of our fiber optic backbone network;

  .  marketing and other expenses aimed at increasing our customer base;

  .  pricing changes and the introduction of new products or services by us or
     our competitors;

  .  our ability to obtain sufficient supplies of sole- or limited-source
     equipment and telecom facilities on a timely basis;

  .  potential adverse regulatory developments;

  .  technical difficulties, system downtime, undetected software errors and
     other problems affecting the Internet generally or the operation of our
     network;

  .  economic conditions specific to the Internet and online media and general
     economic conditions; and

  .  longer sales cycles for newer service offerings.

                                       9
<PAGE>

  We base our expenses to a significant extent on our expectations of future
revenues. Most of our expenses are fixed in the short term, and we may not be
able to quickly reduce spending if our revenues are lower than we expect.
Moreover, in an attempt to enhance our long-term competitive position, we may
from time to time make decisions regarding pricing, marketing, services and
technology that could have a near-term material adverse effect on our business,
financial condition and operating results.


We face intense competition in the data communications services industry.

  The market for data communications, Internet and related services is intensely
competitive, quickly evolving and subject to rapid technological change. We
anticipate that competition will continue to intensify as the use of data
communications and the Internet grows. The tremendous growth and potential size
of the market have attracted many new start-ups as well as established
businesses from different industries. We believe that our principal competitors
are generally classified as network service providers who operate and maintain a
national backbone network. Customers of network service providers typically
include other Internet service providers, regional Bell operating companies,
cable television companies and a variety of network operators entering the
internet service provider business. In addition, network service providers may
also compete with us by providing retail services such as Internet access,
virtual private networks and web hosting services directly to businesses and
consumers. We believe our network service provider competitors include UUNet,
Cable & Wireless, Sprint, PSINet, GTE Interworking, AT&T and Qwest.

  Some of these competitors have significantly greater market presence, brand
recognition and financial, technical and personnel resources than we do. Many of
our competitors may also have the ability to bundle Internet access and data
transmission with basic local and long distance telecommunications services.
This bundling of services may have an adverse effect on our ability to compete
effectively with them and may result in pricing pressure on us.

  We also believe that new competitors will enter the network services market
with new technologies and methods of distribution, including large computer
hardware, software and media and other technology and telecommunications
companies, resulting in greater competition and pricing pressure as more
capacity becomes available. For instance, cable companies, AT&T and Microsoft
have announced that they are exploring broadband services for high speed
Internet connectivity that will rely on cable modems and economical network
upgrades. Other companies have announced plans to provide Internet access via
wireless terrestrial and satellite-based technologies. This capacity will be
added to that of the U.S. long distance fiber optic networks owned by each of
AT&T, MCI WorldCom and Sprint, as well as numerous local networks. Others,
including Qwest, IXC Communications and Williams Companies, are deploying
additional networks that use advanced technology similar to that of our fiber
backbone being constructed by Level 3.

  The increase in the number of competitors in this industry has been
accompanied by vertical and horizontal integration and consolidation among
competitors. The number of businesses providing Internet-related and network
services is growing rapidly. We are aware of other companies, in addition to
those named above, that have entered into or are forming joint ventures or
consortia to provide services similar to those provided by us. Others may
acquire the capabilities necessary to compete with us through acquisitions.

  As a result of the increase in the number of competitors and the vertical and
horizontal integration in the industry, we currently encounter and expect to
continue to encounter significant pricing pressure and other competition in the
future. Increased price or other competition could result in erosion of our
market share and could have a material adverse effect on our business, financial
condition and results of operations. We cannot assure you that we will have the
financial resources, technical expertise, portfolio of services or marketing and
support capabilities to continue to compete successfully.


Increased industry capacity and other factors could lead to lower prices for our
services.

                                       10
<PAGE>

  The long distance transmission industry has been characterized by overcapacity
and falling prices since shortly after the break-up of AT&T in 1984. We expect
that prices for communications services generally will continue to fall over the
next several years, primarily due to:

  .  recent technological advances that permit large increases in the
     transmission capacity of both new and existing fiber;

  .  strategic alliances or similar transactions, such as purchasing alliances
     for long distance capacity among local exchange carriers that increase the
     parties' purchasing power; and

  .  construction of new networks and competing satellite systems.


We face risks associated with entering new lines of business that could cause
our results to suffer.

  A key component of our strategy is to acquire fiber optic backbone that
increases our capacity to deliver services that require higher bandwidth and to
lease some of our fiber optic capacity to other companies. The following risks
are inherent in entering this new line of business:

  .  a potential decrease in the price for our bandwidth capacity resulting from
     a significant increase in capacity in the marketplace as networks currently
     under construction come on line;

  .  a lack of financial resources to make the necessary capital expenditures to
     take full advantage of the bandwidth available to us;

  .  unexpected changes in regulatory requirements as a result of combining our
     old lines of business with the new lines of business;

  .  loss of management and marketing staff focus and attention;

  .  problems reaching our new target market for bandwidth leasing services;

  .  failure to integrate the sales and marketing of our new lines of business
     with our existing services; and

  .  inability to compete in the new line of business against established brand
     names.


We have incurred substantial indebtedness and may not be able to service our
debt.

  We have and will continue to have a significant amount of outstanding
indebtedness and debt service requirements. At December 31, 1999, our total debt
(including current portion of capital lease obligations) was $298.4 million and
stockholders' deficit was $45.2 million. Interest on this indebtedness totals
approximately $33 million per year. The historical earnings of Splitrock were
insufficient to cover its fixed charges for the years ended December 31, 1998
and 1999 by approximately $57.8 million and $103.3 million, respectively. Our
debt has important consequences for our company and for you, including the
following:

  .  our ability to obtain additional financing in the future, whether for
     working capital, capital expenditures, acquisitions or other purposes, may
     be impaired;

  .  a substantial portion of our cash flow from operations is dedicated to the
     payment of interest on our debt, which reduces the funds available to us
     for other purposes;

  .  our flexibility in planning for or reacting to changes in market conditions
     may be limited; and

  .  we may be more vulnerable in the event of a downturn in our business.

                                       11
<PAGE>

     Our ability to meet our debt service obligations will depend on our future
operating performance and financial results. This ability will be subject in
part to factors beyond our control. Although we believe that our cash flow will
be adequate to meet our interest payments, we cannot assure you that we will
continue to generate sufficient cash flow in the future to meet our debt service
requirements, including payment of interest expense and principal on the notes.
If we are unable to generate cash flow in the future sufficient to cover our
fixed charges and are unable to borrow sufficient funds from other sources, then
we may be required to:

     .  refinance all or a portion of our existing debt;

     .  attempt to issue additional equity securities, which may result in
        dilution of ownership percentages for our existing stockholders; or

     .  sell all or a portion of our assets.

     We cannot assure you that a refinancing or offering of equity securities
would be possible. We cannot assure you that any asset sales would be timely or
that the proceeds which we could realize from asset sales would be sufficient to
meet our debt service requirements. In addition, the terms of our debt
securities and fiber agreements restrict our ability to sell or sublease our
assets and our use of the proceeds from any asset sale, See "Description of the
Notes--Certain Covenants" for more information.

We will need additional capital in the future and additional financing may not
be available.

     We currently anticipate that our available cash resources will be
sufficient to meet our anticipated working capital and capital expenditure
requirements for the reasonably forseeable future. We cannot assure you that
these resources will be adequate to fund anticipated and unanticipated losses,
working capital requirements and capital expenditures during this period. We
intend to finance additional cash requirements by raising additional funds
through the issuance of new securities, vendor financing, bank financing,
strategic relationships or some combination of the foregoing. We may also need
to raise additional funds in order to:

     .  take advantage of unanticipated opportunities, including more rapid
        international expansion or acquisitions of complementary businesses or
        technologies;

     .  develop new services; or

     .  respond to unanticipated competitive pressures.

     We may also raise additional funds through public or private debt or equity
financings if these sources of financing become available on favorable terms. We
cannot assure you that the additional financing we will need will be available
on terms favorable to us, or at all. If adequate funds are not available or are
not available on acceptable terms, we may not be able to take advantage of
unanticipated opportunities, develop new services or otherwise respond to
unanticipated competitive pressures. In that case, our business, results of
operations and financial condition could be materially adversely affected. Our
forecast of the period of time through which our financial resources will be
sufficient to support our operations is a forward looking statement that
involves risks and uncertainties, and actual results could vary materially as a
result of a number of factors, including those set forth above.

Restrictions imposed on us as a result of our current indebtedness could
adversely affect our ability to raise further capital.

     The terms of our current indebtedness, including the indentures governing
the notes, contain financial and operating covenants that limit the discretion
of our management. These covenants place significant restrictions on our ability
to:

     .  incur additional indebtedness;

                                       12
<PAGE>

     .  create liens or other encumbrances;

     .  make dividend payments and investments;

     .  sell or otherwise dispose of assets; or

     .  merge or consolidate with other companies.

These restrictions could adversely affect our ability to raise further capital.
Furthermore, the failure to comply with our current covenants may result in an
event of default, which, if not cured or waived, could have a material adverse
effect on Splitrock.

     Some of our assets were previously pledged or may be pledged for other
obligations and the proceeds from their sale will not be available for payment
of our obligations on the notes until the other debts are satisfied.

     The notes are senior obligations of Splitrock ranking pari passu in right
of payment with all existing and future senior indebtedness of Splitrock. The
notes are unsecured except for the security interest held by the Trustee in an
escrow account established for the benefit of holders of the notes. The
Indenture will permit Splitrock to incur secured indebtedness. Holders of
secured indebtedness of Splitrock will have claims with respect to the assets
constituting collateral for that indebtedness that are prior to the claims of
holders of notes. In the event of a default on the notes, or a bankruptcy,
liquidation or reorganization of Splitrock, assets securing indebtedness other
than the notes will be available to satisfy those obligations before any payment
from the assets could be made on the notes and the notes will be effectively
subordinated to claims of secured creditors of Splitrock to the extent of any
pledged collateral. At December 31, 1999, Splitrock had $40 million of secured
indebtedness outstanding other than the notes. See " Description of the Notes,"
"Description of Certain Indebtedness" and Splitrock's historical financial
statements and notes thereto included elsewhere in this Prospectus for more
information.

     Our cash flow, and therefore our ability to meet payments on the notes may
be dependent on the financial results of our subsidiaries and, in the future,
the operation of a holding company.

     Splitrock is an operating entity that may conduct more of its business in
the future through subsidiaries, including Splitrock Leasing, LLC, through which
we lease a significant portion of our capital equipment. After our holding
company reorganization, Splitrock Holdings, Inc. will become a holding company
entity and our sole stockholder. Our cash flow from operations and consequent
ability to service our debt, including the notes, may therefore in the future
become in part dependent upon the earnings of our subsidiaries and our holding
company and the distribution of those earnings to Splitrock, or upon loans,
advances or other payments of funds by any subsidiaries or the holding company
to Splitrock. It is not anticipated that our subsidiaries or the holding company
will have any obligation, contingent or otherwise, to make funds available to
Splitrock for payment of the principal of or interest on the notes, except for
any subsidiary that Incurs Indebtedness (as defined in the indenture governing
the Notes) which must guarantee Splitrock's obligations under the notes. To
date, Splitrock Leasing has become a subsidiary guarantor of the notes, and
Splitrock Holdings or Splitrock Merger Sub, should they Incur Indebtedness, will
also become subsidiary guarantors. The ability of any subsidiary or the holding
company to make payments will be subject to, among other things, the
availability of sufficient surplus funds, the terms of such subsidiary's or the
holding company's indebtedness and applicable laws. Claims of creditors of any
subsidiary or the holding company and holders of preferred stock, if any, of any
subsidiary or the holding company will have priority as to the assets of that
subsidiary or the holding company over the claims of Splitrock and the holders
of Splitrock's indebtedness. Therefore, the notes will be effectively
subordinated in right of payment to all existing and future indebtedness and
other liabilities of Splitrock's subsidiaries and holding company, including
trade payables.

     We may not have the financial resources to repurchase the notes as required
when events that constitute a "Change of Control" occur.

                                       13
<PAGE>

     The Indenture governing the notes provides that upon the occurrence of an
event that constitutes a "Change of Control" each holder of notes can require
Splitrock to repurchase all or any part of the holder's notes at a price in cash
equal to 101% of the aggregate principal amount of their notes plus accrued and
unpaid interest and liquidated damages, if any, to the date of repurchase. The
Indenture allows Splitrock to incur senior indebtedness. The terms of any senior
indebtedness may prohibit the repurchase of the notes by Splitrock in the event
of a "Change of Control," unless and until such time as the senior obligation is
repaid in full. In that case, Splitrock would need to obtain the consent of the
requisite lenders of the senior indebtedness or repay the senior indebtedness in
full before repurchasing the notes. Our failure to repurchase the notes would
result in a default under the Indenture. The inability to repay any future
indebtedness, if accelerated, would also constitute an event of default under
the Indenture. There can be no assurance that Splitrock will have the financial
resources necessary to repurchase the notes or any other indebtedness upon a
"Change of Control" event.

     Consummation of the merger with McLeodUSA will trigger a change in control
of Splitrock, as defined in the indenture governing the notes. As a result, each
holder of our notes will be able to require us to repurchase some or all of the
holder's notes at a purchase price equal to 101% of their principal amount, plus
accrued and unpaid interest. See "Description of the Notes - Change of Control."

     The ability of the Trustee to foreclose on the collateral in the escrow
account set aside by Splitrock for the benefit of the holders of the notes could
be impaired by applicable bankruptcy law.

     The Trustee for the notes has the right under the Indenture governing the
notes and a related Escrow and Disbursement Agreement to foreclose upon and sell
collateral set aside in an escrow account when an event constituting default on
the notes occurs. Applicable bankruptcy law is likely to significantly impair
the Trustee's right to do this if a bankruptcy or reorganization case were
commenced by or against Splitrock because secured creditors, such as the holders
of the notes, are prohibited from foreclosing upon or disposing of a debtor's
property without prior bankruptcy court approval once a proceeding has
commenced. See "Description of the Notes -- Disbursement of Funds; Escrow
Account."

     We may be unable to pay principal or interest on the notes in the event of
bankruptcy because federal and state statutes allow courts to further
subordinate or void those payments.

     Fraudulent conveyance laws have been enacted for the protection of
creditors. A court could further subordinate payments under the notes to our
existing or future indebtedness or even void the payments or take other
detrimental actions if, in a bankruptcy or reorganization case or a lawsuit by
or on behalf of unpaid creditors of Splitrock, a court were to find that, at the
time Splitrock incurred indebtedness under the notes, that

     .  Splitrock incurred such indebtedness with the intent of hindering,
        delaying or defrauding current or future creditors or

     .  Splitrock received less than reasonably equivalent value or fair
        consideration for incurring such indebtedness and

        .  was insolvent or was rendered insolvent by reason of such incurrence,

        .  was engaged, or about to engage, in a business or transaction for
           which its assets constituted unreasonably small capital,

        .  intended to incur, or believed that it would incur, debts beyond its
           ability to pay such debts as they matured (as all of the foregoing
           terms are defined in or interpreted under the relevant fraudulent
           transfer or conveyance statutes) or

        .  was a defendant in an action for money damages, or had a judgment for
           money damages docketed against it (if, in either case, after final
           judgment, the judgment is unsatisfied).

                                       14
<PAGE>

  The measures of insolvency for purposes of these fraudulent transfer laws
vary depending upon the law of the jurisdiction which is being applied.
Generally, however, a party would be considered to have been insolvent at the
time the notes were issued if:

     .  the sum of its debts was, at that time, greater than the sum of the
        value of all of its property at a fair valuation, or

     .  the then fair saleable value of its assets was less than the amount that
        was then required to pay its probable liability on its existing debts as
        they became absolute and matured; or

     .  it could not pay its debts as they become due.

  There can be no assurance as to what standard a court would apply in order to
determine whether Splitrock was insolvent as of the date the notes were issued,
whether a court would determine that Splitrock was insolvent on that date, or
whether the issuance constituted a fraudulent transfer. Additionally, under
federal bankruptcy law or applicable state insolvency law, if bankruptcy or
insolvency proceedings were initiated by or against Splitrock within 90 days
after any payment by Splitrock with respect to the notes or if Splitrock
anticipated becoming insolvent at the time of a payment, all or a portion of the
payment could be avoided as a preferential transfer and the Note holder, as
recipient of the payment, could be required to return the payment.

Any failure or delays by Level 3 in completing our new fiber optic backbone
network could materially and adversely affect our business.

  In April 1999, we entered into an agreement with Level 3 Communications, LLC
which gives us the exclusive right to use portions of Level 3's nationwide fiber
network for a 20-year period. Our ability to fully implement our present
business plan could be adversely affected if Level 3 fails to perform its
obligations under this agreement. Level 3 may be delayed or prevented from
completing its fiber network and performing its obligations under our agreement
due to:

  .  insufficient capital resources;

  .  failure of its suppliers to provide the necessary equipment and services;

  .  regulatory changes affecting its rights of way;

  .  a change in management strategy; or

  .  presently unforeseeable legal, technical or other factors.

  Our business plan assumes that we will use dark fiber strands from Level 3 to
deliver our services on the fiber optic portion of our network. If Level 3 does
not successfully complete the installation of these dark fiber segments, we may
not be able to provide our services or provide them at the level of quality,
efficiency and economy assumed in our business plan. While we believe that we
could transfer our business to another supplier if Level 3's segments are not
available, we may not find an alternate network which would provide comparable
technology at a competitive cost. Level 3 has not completed construction of its
network segments. Any failure by Level 3 to complete construction of, or deploy
and maintain, its dark fiber segments could hurt our business.

  Under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, we may be
required to notify the Federal Trade Commission of the transactions contemplated
by our agreement with Level 3. If this notification is required, we will not be
able to consummate the transactions contemplated by the Level 3 agreement until
the requirements of the Hart-Scott-Rodino Act have been satisfied and any
applicable waiting period has expired or terminated.

                                       15
<PAGE>

Our business plan assumes that we will be able to expand and scale our network
infrastructure to accommodate increased volumes of traffic and customers;
however, our ability to scale our network by large proportions is unproven.

  Our network currently handles more than approximately 2.5 billion minutes of
use per month. However, our ability to scale the network up to meet our expected
customer usage levels while maintaining superior performance and integrating and
managing the fiber optic backbone is unproven. As the number of our customers
grows or as network usage increases, we may need to make additional investments
to expand and adapt our network infrastructure and maintain adequate data
transmission speeds. Any future expansion and adaptation of our communications
and facility infrastructure could require substantial financial, operational,
technical and management resources. If we are required to expand our network
significantly and rapidly due to increased usage, additional stress will be
placed upon our network hardware, traffic management systems and facilities.


Our business depends on the continued growth of the Internet and the demand for
data communications services and could suffer if demand declines.

  Our business would be adversely affected if use of the Internet and the data
communications industry does not continue to grow or grows more slowly than
expected. Factors that may inhibit the continued growth of the Internet and the
data communications industry include the following:

  .  the ability of the Internet and data networking infrastructure to support
     the growing demands placed on it;

  .  access costs;

  .  the performance and reliability of products and services as the number of
     users and amount of traffic increases;

  .  the ability of businesses to adequately address security and privacy
     concerns;

  .  the development of legislation or regulation related to the Internet; and

  .  the nature and pace of technological changes relating to the Internet and
     data communications.

In addition, websites have experienced interruptions in their service as a
result of outages and other delays occurring throughout the Internet network
infrastructure. If these outages or delays occur frequently, use of the Internet
as a commercial or business medium could, in the future, grow more slowly than
expected or decline. This would have an adverse affect on our business.


Our network system could fail resulting in losses and loss of user confidence.

  Our success depends upon our ability to deliver reliable, high-speed access to
the Internet and upon the ability and willingness of our telecommunications
providers to deliver reliable, high-speed telecommunications service through
their networks. Our network, and other networks providing services to us, are
vulnerable to damage or cessation of operations from fire, earthquakes, severe
storms, power loss, telecommunications failures, excessive, sustained, or peak
user demand, and similar events, particularly if these events occur within a
high traffic location of the network. We cannot assure you that we will not
experience failures or shutdowns relating to individual POPs or even
catastrophic failure of the entire network. We carry business personal property
insurance to protect us against losses due to property damage and business
interruption. This coverage, however, may not be adequate or available to
compensate us for all losses that may occur. In any event, significant or
prolonged system failures or shutdowns could damage our reputation and result in
the loss of customers.

                                       16
<PAGE>

Our network is potentially vulnerable to viruses, break-ins or disruptions.

  Despite our security measures, our network's infrastructure is potentially
vulnerable to computer viruses, break-ins and similar disruptive problems caused
by our customers or others. Computer viruses, break-ins or other problems could
lead to interruptions, delays or cessation in service to our customers.
Furthermore, inappropriate use of the Internet by third parties could also
potentially jeopardize the security of confidential information stored in the
computer systems of our customers. This could, in turn, deter potential
customers and adversely affect our existing customer relationships. Security
problems represent an ongoing threat to public and private data networks. The
security services that we offer in connection with our customers' networks
cannot assure complete protection from computer viruses, break-ins and other
disruptive problems. Although we attempt to limit contractually our liability in
these instances, the occurrence of problems may result in claims against us or
liability on our part. These claims, regardless of their ultimate outcome, could
result in costly litigation and could have a material adverse effect on our
business or reputation or on our ability to attract and retain customers for our
products. Moreover, until more consumer reliance is placed on security
technologies available, the security and privacy concerns of existing and
potential customers may inhibit the growth of the Internet service industry and
our customer base and revenues.

We must keep pace with technological change and evolving industry standards to
remain competitive and increase our revenues.

  The market for data communications and Internet access and related services is
characterized by rapidly changing technology, evolving industry standards,
changes in customer needs and frequent new product and service introductions.
Our future success will depend, in part, on our ability to:

  .  effectively use and develop leading technologies;

  .  continue to develop our technical expertise;

  .  enhance our current services;

  .  develop new services that meet changing customer needs; and

  .  respond to emerging industry standards and technological changes in a cost-
     effective manner.

If our services do not continue to be compatible and interoperable with products
and architectures offered by various other members of the industry, our ability
to compete could be impaired. We cannot assure you that we will be successful in
responding to changing technology or market trends. In addition, services or
technologies developed by others may render our services or technologies
uncompetitive or obsolete. Furthermore, changes to our services in response to
market demand may require the adoption of new technologies that could likewise
render many of our assets technologically uncompetitive or obsolete. Even if we
do successfully respond to technological advances and emerging industry
standards, the integration of new technology may require substantial time and
expense, and we cannot assure you that we will succeed in adapting our network
infrastructure in a timely and cost-effective manner.

Changes in government regulations could adversely affect our business by
increasing costs or imposing limitations on the services we provide.

  To date, we have not been subject to common carrier regulation by the FCC or
state public utility commissions, but the growth of Internet telephony and
changing technology has led regulators to consider regulating some Internet
services. We do not believe that we are subject to this type of regulation.
However, if such regulation is applied to us, we could incur substantial
regulatory costs, including obligations to contribute directly to federal and
state universal service funds. Government entities have also attempted to apply
various forms of content regulation to Internet service providers, though in
some cases Congress or the courts have made decisions that shielded Internet
service providers from liability for the content that they convey. Other
legislative and regulatory decisions designed to encourage the development of
competition in the provision of telecommunications services could

                                       17
<PAGE>

benefit certain of our competitors that are affiliated with facilities-based
carriers, and may provide at least a temporary competitive advantage to those
companies.

The imposition of taxes on our services could adversely affect our business.

  We are uncertain what additional laws and regulations regarding taxation of
our services may be adopted due to the increasing popularity, development and
use of data communications facilities and services and the Internet in
particular. A number of state and local government officials have asserted the
right or indicated a willingness to impose taxes on Internet-related services
and commerce, including sales, use and access taxes. We cannot predict how the
activities in our industry will be taxed, and therefore how the costs of
supplying our services may be affected, in the future because there is no
precedent for many of these activities. The imposition of new taxes, directly or
indirectly, on our services could adversely affect our business, financial
condition and results of operations depending on their magnitude and our ability
to pass on the costs to end-users.

  The services we provide to Prodigy may be subject to sales or use taxes in a
number of states. Prodigy has agreed to indemnify us for these taxes if they are
due.

We depend on sole- and limited-source suppliers for critical products and
services.

  We rely on other companies to supply key components of our network, operations
support, and administration infrastructure. These components include critical
telecommunications services and networking equipment, which, in the quantities
and quality demanded by us, are available only from sole- or limited-sources. We
depend on sole- or limited-source suppliers for the following products or
services:

  .  Fiber Optic Equipment - Nortel supplies us with all of the equipment for
     our fiber optic backbone.

  .  ATM switching products--Lucent Technologies supplies us with all of our ATM
     switching products.

  .  Internet dial access platform--Nortel provides us with our Internet dial
     access platform.

  .  Routers--Cisco Systems manufactures the routers used in our network.

  .  Servers--We purchase our servers from Sun Microsystems and Compaq.

  With the exception of equipment provided by Nortel, we do not carry
significant inventories of these components and have no guaranteed supply
arrangements for these components. Our suppliers also sell products to our
competitors and may in the future themselves become our competitors. We cannot
assure you that our suppliers will not enter into exclusive arrangements with
our competitors or stop selling their products or components to us at
commercially reasonable prices, or at all. Our inability to obtain sufficient
quantities of sole- or limited-source components or to develop alternative
sources, if required, could result in delays and increased costs in expanding,
and overburdening of, our network infrastructure. Any delay, increased costs or
overburdening of our network would have a material adverse effect on our
business, financial condition and results of operations.

  We also depend on local and long distance telephone companies to provide
telecommunications services to us and our customers. We experience delays from
time to time in receiving supplies and telecommunications services from our
suppliers. We cannot assure you that we will be able to obtain these supplies or
services on the scale, of the quality, and within the time frames required by us
at an affordable cost, or at all. Any failure to obtain these services on a
sufficient scale, on a timely basis or at an affordable cost would have a
material adverse effect on our business, financial condition and results of
operations.

                                       18
<PAGE>

We may be subject to legal liability for distributing or publishing content over
the Internet which could be costly for us to defend.

  Congress and several states have enacted or are considering measures that
would, under some circumstances, impose civil and criminal liability upon
Internet service providers, or providers of transmission capacity to Internet
service providers, for the transmission or dissemination of information and
materials. It is possible that costly claims will be made against us in
connection with the nature and content of the materials disseminated through our
networks. Currently, several private lawsuits of this sort are pending against
other online services companies and Internet access providers. Given the
heightened attention this topic has recently received, and will continue to
receive if any of the current lawsuits are successful, we might be required to
respond by investing substantial resources or discontinuing some of our service
offerings. These factors may also cause growth of Internet use to decline.
Finally, although we carry general liability insurance, it may not be adequate
to compensate us or it may not cover us in the event we become liable for
information carried on or disseminated through our networks. Any costs not
covered by insurance incurred as a result of liability or asserted liability for
information carried on or disseminated through our networks could hurt our
business.


We depend on other companies for peering and interconnection arrangements.

  We maintain peering and interconnection arrangements with other network
service providers so that we can exchange traffic with them. Recently, companies
that previously offered peering have eliminated peering relationships or
established new, more restrictive criteria for peering. We are uncertain whether
other network service providers will continue peering and interconnection
arrangements on acceptable terms or impose settlement charges as a result of an
increasingly competitive Internet services industry dominated by a smaller group
of national network providers.


The network design and technical expertise that we depend on may be developed or
similarly deployed by others.

  Our success and ability to compete is dependent in part upon our technical
expertise. We do not have proprietary rights that would prevent our competitors
from deploying technologies or independently developing a network design and
technical expertise that are substantially equivalent or superior to our own.
The construction by our competitors of networks similar to our own may adversely
affect our ability to compete effectively.


Third parties may claim we infringe their proprietary rights and these claims
could result in increased costs.

  Although we do not believe we infringe the proprietary rights of any third
parties, we cannot assure you that third parties will not assert claims against
us in the future or that those claims will not be successful. We could incur
substantial costs and diversion of management resources to defend any claims
relating to proprietary rights, which could have a material adverse effect on
our business, financial condition and results of operations. Furthermore,
parties making those claims could secure a judgment awarding substantial
damages, as well as injunctive or other equitable relief that could effectively
block our ability to license our products in the United States or abroad. Such a
judgment would have a material adverse effect on our business, financial
condition and results of operations. In addition, we are obligated under various
agreements to indemnify the other party for claims that we infringe on the
proprietary rights of third parties. If we are required to indemnify parties
under these agreements, our business, financial condition and results of
operations could be materially adversely affected. If someone asserts a claim
relating to proprietary technology or information against us, we may seek
licenses to that intellectual property. We cannot assure you, however, that we
could obtain licenses on commercially reasonable terms, if at all. The failure
to obtain the necessary licenses or other rights could have a material adverse
effect on our business, financial condition and results of operations.

                                       19
<PAGE>

We may be unable to successfully acquire other companies, form strategic
alliances or successfully integrate any acquisition or alliance.

  If we do not consummate the merger, we will evaluate strategic alliances and
acquisitions as they present themselves. Any future strategic alliance or
acquisition involves risks commonly encountered in business relationships. We
may encounter obstacles while integrating the operations and personnel of the
companies and the integration efforts may disrupt our ongoing business. Our
management may be unable to successfully incorporate licensed or acquired
technology and rights into our service offerings or maintain uniform standards,
controls, procedures and policies within the two organizations. Changes in
management resulting from an alliance or acquisition could impair relationships
with employees and customers. Any international alliance or acquisition would
involve the additional risks of doing business abroad, including unexpected
changes in the regulatory environments, export controls, tariffs, fluctuations
in currency exchange rates and potentially adverse tax consequences. We may not
successfully overcome these risks or any other problems encountered in
connection with strategic alliances or acquisitions. In addition, we could incur
substantial expenses, including the expenses of integrating the parties'
businesses in a strategic alliance or after an acquisition, which could, in
turn, adversely affect our business, financial condition and results of
operations.


Our directors have relationships that could present conflicts of interest.

  Our directors have relationships with other companies that could result in
potential conflicts of interest.

  .  Since 1991, James M. Nakfoor has served as the Vice President of Securities
     Trading for Inversora Bursatil, S.A. de C.V., a wholly-owned subsidiary of
     Grupo Financiero Inbursa, S.A. de C.V., and an affiliate of our second
     largest stockholder, Carso Global. Carso Global currently controls our
     largest customer, Prodigy, on whose board Mr. Nakfoor has served since
     September 1997. Prodigy's President and Chief Executive Officer, Samer
     Salameh, was a member of our board of directors until April 1999.

  .  Mr. Li was Director, Vice Chairman, Chief Technology Officer and owner of
     12.4% of the common stock of Yurie, which was one of our principal
     suppliers until it was sold to Lucent. In connection with the sale of Yurie
     to Lucent, Linsang has agreed to make the services of Mr. Li available to
     Lucent to provide technical guidance for both the Lucent AC-120 and
     Lucent's entire line of other ATM switches. The agreement has a term of
     three years and terminates on May 29, 2001. Mr. Li is Chief Technical
     Officer, Carrier Network Division of Lucent and has agreed not to
     participate in designing, developing, producing, manufacturing or marketing
     multi-service access equipment other than for Lucent. Mr. Li and members of
     his family also control Linsang, which is our largest stockholder.

  .  Mr. Turner is also a member of the advisory board of our largest
     stockholder, Linsang, the limited liability company controlled by Mr. Li
     and members of his family.

  .  Mr. Roy A. Wilkens also serves on the board of directors of McLeodUSA,
     which has agreed to acquire all of our outstanding common stock.  McLeodUSA
     has announced that if the merger is consummated, Mr. Wilkens will become
     the President and Chief Executive Officer of Data Services Operations of
     McLeodUSA, which will include Splitrock.  Mr. Wilkens did not participate
     in our board's consideration of the merger agreement.

  As a result of these relationships, there is a potential for conflicts of
interest to arise when our directors are faced with a decision that could have
different implications for our company and the other companies with which our
directors have a relationship. Due to the nature of the potential conflicts of
interest presented by these relationships on an ongoing basis, we cannot assure
you that the directors involved will act in the best interests of our company
and our stockholders.

  Affiliates of ours have engaged in numerous transactions with us in the past.
These transactions were not necessarily a result of arms'-length negotiations.
We may engage in additional related party transactions in the future and we
cannot assure you that these transactions will be on arms'-length terms.

                                       20
<PAGE>

Our existing stockholders will maintain control of us after the offering and
have agreed to vote their shares in favor of the holding company reorganization
and subsequent McLeodUSA merger.

  Our executive officers and directors and entities affiliated with them, in the
aggregate, beneficially own approximately 79.8% of our common stock. These
stockholders will continue to be able to exercise control over all matters
requiring approval by our stockholders, including the election of directors and
the approval of significant corporate transactions. This concentration of
ownership may also have the effect of delaying or preventing a change in control
of our company, which could negatively affect our stock price. Some of our
executive officers, directors and principal stockholders who collectively own
approximately 52.3% of our outstanding common stock, including Kwok Li and
William R. Wilson and their affiliates, agreed to vote the shares over which
they have voting control in favor of approving the merger agreement. Several of
these stockholders who collectively own approximately 50.5% of our outstanding
common stock have also entered into stock option agreements with McLeodUSA
granting McLeodUSA an option to purchase their Splitrock shares. The option is
exercisable in specified circumstances, including where a party other than
McLeodUSA acquires or seeks to acquire us. If McLeodUSA exercises the option, it
will exercise control over all matters requiring approval by our stockholders.

Future sales of our common stock may negatively affect our stock price.

  We will have a large number of shares of common stock outstanding and
available for resale beginning at various points in time in the future. The
market price of our common stock could decline as a result of sales of a large
number of shares of our common stock in the market or the perception that sales
could occur. These sales also might make it more difficult for us to sell equity
securities in the future at a time and at a price that we deem appropriate.

Provisions of our certificate of incorporation, bylaws and Delaware law could
deter takeover attempts.

  Our certificate of incorporation and bylaws and the Delaware corporations law
contain provisions that could have the effect of making it more difficult for a
third party to acquire, or discourage a third party from attempting to acquire,
control of us. These provisions could limit the price that investors might be
willing to pay in the future for shares of our common stock.

There has been no prior public market for our securities other than our common
stock and our stock price may experience extreme price and volume fluctuation.

  Splitrock does not intend to list the warrants or the notes on any national
securities exchange or to seek approval for quotation through any automated
quotation system. The warrants and the notes are also no longer eligible for
trading in the Private Offerings, Resales and Trading through Automated Linkages
or PORTAL Market. Our common stock has traded on the Nasdaq Stock Market since
August 3, 1999. Chase Securities currently makes a market in the warrants and
the notes, but it is not obligated to do so and may discontinue that market
making at any time. In addition, market making activities are subject to the
limits imposed by the Securities Act and the Exchange Act. Accordingly, no
assurance can be given that an active public or other market will develop for
the notes and the warrants, or as to the liquidity of the trading market for
such securities. If a trading market does not develop or is not maintained,
holders of the warrants, the warrant shares and the notes may experience
difficulty reselling their securities or may be unable to sell them at all and
thus be required to bear the financial risks of the investment for an indefinite
period of time. If a market for the securities develops, it may be discontinued
at any time.

  If an active public trading market develops for the warrants or the notes,
future trading prices of such securities, as well as our common stock, will
depend on many factors, including, among other things, prevailing interest
rates, Splitrock's results of operations and the market for similar securities,
and such securities may trade at a discount from their initial offering price.
Historically, the market for similar securities, including non-investment grade
debt,

                                       21
<PAGE>

has been subject to disruptions that have caused substantial volatility in the
prices of such securities. There can be no assurance that any market for our
securities, if developed, will not be subject to similar disruptions.

     The stock market has experienced extreme price and volume fluctuations. The
market prices of the securities of technology companies and Internet-related
companies in particular have been especially volatile. This volatility has
included rapid and significant increases in the trading prices of Internet
companies following initial public offerings to levels that do not bear any
reasonable relationship to the operating performance of those companies and
large inter-day swings in the trading prices of their securities. These
fluctuations may materially affect the trading price of our common stock. We
cannot guarantee that you will be able to sell your warrant shares at or above
the current public market price.

     In the past, stockholders have often instituted securities class action
litigation following periods of volatility in the market price for a company's
securities. Such litigation could result in substantial costs and the diversion
of management's attention and resources, which could have a material adverse
effect on our business, financial condition and results of operations.

The reliability of market data included in this prospectus is uncertain.

     Since we are a new company and operate in a new and rapidly changing
market, we have included market data from industry publications, including
reports produced by Forrester Research, Inc. and International Data Corporation.
The reliability of these data cannot be assured. These industry publications
generally indicate that they have obtained information from sources believed to
be reliable, but do not guarantee the accuracy and completeness of their
information. While we believe these industry publications to be reliable, we
have not independently verified their data. We also have not sought the consent
of any of these organizations to refer to their reports in this prospectus.

                                USE OF PROCEEDS

     We will receive proceeds of $0.02 per share issued upon the cash exercise
of any warrant. Assuming that all of the warrants are exercised for cash, we
will realize net proceeds of approximately $14,591. We intend to use the net
proceeds from this offering for working capital and other corporate purposes. We
will not receive any proceeds from:

     .    the cashless exercise of any warrant;

     .    the transfer of warrant shares by the warrant agent, as custodian, to
          the warrant holders;

     .    the sale of any warrants or notes by selling securityholders. or

     .    the subsequent resale of the warrant shares by our stockholders.

                                SELLING HOLDERS

     As of February 29, 2000, 138,980 warrants remained outstanding, and a total
of 792,235 shares of Splitrock common stock would be beneficially owned by the
selling stockholders and offered hereby, assuming that all of the warrants were
exercised. The following tables set forth information about the selling holders
as of February 29, 2000 that we obtained from the selling holders. The figures
in the last column assume that all of the warrants have been properly exercised
for cash. Other than Linsang, a company controlled by Kwok Li, which together
with Mr. Li, a founder and Chairman of the Board of Splitrock, owns
approximately 46.2% of the Company's outstanding shares, none of the selling
holders has or since our inception has had any position, office or other
material relationship with Splitrock or any of its affiliates. Under the warrant
agreement, Splitrock must, before any merger, issue the warrant shares
underlying the remaining outstanding warrants to the warrant agent, as custodian
for the account of the warrant holders. See "Description of the Warrants." After
the warrant shares are issued to the warrant agent, as custodian, for the
account of the warrant holders, the warrant agent (Harris Trust) shall become a

                                       22
<PAGE>

selling holder for purposes of this registration statement and may offer hereby
up to 792,235 shares of Splitrock common stock to the warrant holders upon
exercise of the warrants.

<TABLE>
<CAPTION>
                                                                                                 Number of Shares
                                                                        Number of Warrants       of Common Stock
                                                                        Beneficially Owned      Beneficially Owned
                           Selling Holder                               and Offered Hereby      and Offered Hereby
- -------------------------------------------------------------------     ------------------      ------------------
<S>                                                                   <C>                     <C>
Merrill Lynch Corporate High Yield Fund II, Inc.....................              1,250                   7,125
Merrill Lynch Corporate High Yield Fund III, Inc....................              5,250                  29,927
Merrill Lynch Corporate High Yield Fund, Inc........................              3,500                  19,951
Merrill Lynch Corporate Bond Fund, Inc. High Inc. Portfolio.........              7,000                  39,902
Prudential Series Fund, Inc. High Yield Bond Portfolio                            1,750                   9,976
Debt Strategies Fund II, Inc.                                                     3,000                  17,101
Debt Strategies Fund III, Inc.                                                    3,000                  17,101
Luthern Brotherhood High Yield Fund                                               3,200                  18,241
LB Series Fund, Inc. High Yield Portfolio (RF03)                                  4,800                  27,362
Linsang Partners L.L.C..............................................             11,000                  62,704
Other Selling Holders(1)............................................             95,230                 249,390
                                                                               --------                 -------
     Totals.........................................................            138,980                 792,235
                                                                               ========                 =======
</TABLE>

(1)  The number of shares offered hereby by the remaining unidentified holders
represent less than 1% of the total number of shares of common stock outstanding
as of February 29, 2000.

                                  Principal Amount of Notes
                                  -------------------------
       Selling Holder                 Beneficially Owned
       --------------                 ------------------
                                      and Offered Hereby
                                      ------------------
Linsang Partners LLC.............         $11,000,000

     The warrants offered hereby were originally issued by us and sold by Chase
Securities in a transaction, with respect to 250,000 warrants, exempt from the
registration requirements of the Securities Act to persons reasonably believed
by Chase Securities to be qualified institutional buyers (as defined in
Rule 144A under the Securities Act) and, with respect to 11,000 warrants, in a
private offering to Linsang, an affiliate of Splitrock. The selling holders may
from time to time offer and sell pursuant to this prospectus any or all of the
warrants and the warrant shares issued upon exercise of such warrants.

     The notes offered hereby were received by Linsang in a private exchange
between us and Linsang for notes substantially identical in form and terms to
the notes originally issued by us and sold by Chase Securities in a private
offering to Linsang. Linsang, as a selling holder, may from time to time offer
and sell pursuant to this prospectus any or all of the notes.

     Information concerning the selling holders may change from time to time and
any such changed information will be set forth in supplements to this prospectus
if and when necessary. The per share exercise price and the number of shares
issuable upon exercise of the warrants is subject to adjustment upwards or
downwards in certain circumstances. See "Description of the Warrants --
Adjustments." Moreover, because the selling holders may offer all or some of
the notes, the warrants or the warrant shares issuable upon exercise of the
warrants, no estimate can be given as to the amount of the notes, warrants or
warrant shares that will be held by the selling holders upon the termination of
any such sales. In addition, the selling holders identified above may have sold
or otherwise transferred, in transactions exempt from the registration
requirements of the Securities Act, all or a portion of the warrants, the
warrant shares or the notes since the date with respect to which the information
in the preceding table is presented. See "Plan of Distribution."

     The Company is paying the expenses of the registration of the securities
being offered by this prospectus.

                                       23
<PAGE>

                              PLAN OF DISTRIBUTION

     The warrants, the warrant shares and the notes offered hereby may be sold
from time to time in one or more transactions at fixed prices, at prevailing
market prices at the time of sale, at varying prices determined at the time of
sale or at negotiated prices. These securities may be sold by one or more of the
following methods:

     .    a block trade (which may involve crosses) in which the broker or
          dealer so engaged will attempt to sell such securities as agent but
          may position and resell a portion of the block as principal to
          facilitate the transaction;

     .    purchases by a broker or dealer as principal and resale by the broker
          or dealer for its account pursuant to this prospectus;

     .    an exchange distribution in accordance with the rules of such
          exchange;

     .    ordinary brokerage transactions and transactions in which the broker
          solicits purchasers;

     .    direct transactions between a selling holder and a purchaser without a
          broker or dealer; or

     .    through the writing of options.

     Upon being notified by a selling holder that any material arrangement has
been entered into with a broker-dealer for the sale of warrants, warrant shares
or notes through a block trade, special offering, exchange distribution or
secondary distribution or a purchase by a broker or dealer, we will file a
supplement to this prospectus, if required, pursuant to Rule 424(b) under the
Securities Act, disclosing:

     .    the names of each selling holder and of the participating broker-
          dealer(s);

     .    the number of securities involved;

     .    the price at which such securities were sold;

     .    the commissions paid or discounts or concessions allowed to the
          broker-dealer(s), where applicable;

     .    that the broker-dealer(s) did not conduct any investigation to verify
          the information set out or incorporated by reference in this
          prospectus, and

     .    other facts material to the transaction.

     In addition, upon being notified by a selling holder that a donee or
pledgee intends to sell more than 50 warrants or 500 warrant shares, we shall
file a supplement to this prospectus. Such prospectus supplement and, if
required, post-effective amendment to the Registration Statement of which this
prospectus is a part, will be filed with the Commission to reflect the
disclosure of additional information with respect to the distribution of the
warrants, warrant shares and notes. In addition, any securities covered by this
prospectus may be sold in private transactions or, if qualified for sale
pursuant to Rule 144 under the Securities Act, may be sold under Rule 144 rather
than pursuant to this prospectus.

     To the knowledge of Splitrock, there are currently no plans, arrangements
or understandings between any selling holders and any broker, dealer, agent or
underwriter regarding the sale of the warrants, the warrant shares or the notes
by the selling holders. There is no assurance that any selling holder will sell
any or all of such securities held by such holder or that any selling holder
will not otherwise transfer, devise or gift such securities by other means not
described herein.

     The selling holders and any broker-dealers that act in connection with the
sale of the warrants, the warrant shares and the notes might be deemed to be
"underwriters" within the meaning of Section 2(11) of the Securities Act, and
any commissions received by such broker-dealers and any profit on the resale of
the warrants, the warrant

                                       24
<PAGE>

shares and the notes sold by them while acting as principals might be deemed to
be underwriting discounts or commissions under the Securities Act. The Company
has agreed to indemnify each selling holder against certain liabilities,
including liabilities arising under the Securities Act. The selling holders may
request to have Splitrock indemnify any agent, dealer or broker-dealer that
participates in transactions involving sales of the warrants, the warrant shares
and the notes against certain liabilities, including liabilities arising under
the Securities Act. Because selling holders may be deemed to be "underwriters"
within the meaning of Section 2(11) of the Securities Act, the selling holders
will be subject to the prospectus delivery requirements of the Securities Act.

     Prior to the merger, Splitrock will issue the warrant shares to Harris
Trust, as warrant agent, in exchange for the aggregate exercise price of the
remaining warrants. The warrant agent will hold the warrant shares as custodian
for the account of the warrant holders. Splitrock has agreed to indemnify the
warrant agent against certain liabilities, including those that could arise
under the Securities Act and the Exchange Act, in connection with this custody
arrangement. For more information, see "Description of Warrants."

     The selling holders and any other person participating in the distribution
contemplated in this prospectus will be subject to applicable provisions of the
Exchange Act and the rules and regulations thereunder, including without
limitation Regulation M, which may limit the timing of purchase and sales of any
of the warrants, the warrant shares or the notes by the selling holders and any
other such person. Furthermore, Regulation M of the Exchange Act may restrict
the ability of any person engaged in the distribution of the warrants, warrant
shares or notes to engage in market-making activities with respect to the
warrants, warrant shares and notes being distributed for a period of up to five
business days before commencement of such distribution. All of the foregoing may
effect the marketability of the warrants, the warrant shares and the notes.

                          DESCRIPTION OF THE WARRANTS

     The warrants were issued pursuant to a Warrant Agreement, dated July 24,
1998, as amended on February 24, 2000, between Splitrock and Harris Trust
Company of New York (formerly Bank of Montreal Trust Company), as warrant agent.
The following summary of certain provisions of the Warrant Agreement does not
purport to be complete and is qualified in its entirety by reference to all of
the provisions of the Warrant Agreement, including the definitions therein of
certain terms. Capitalized terms in this "Description of the Warrants" not
defined in this prospectus have the meanings assigned to them in the Warrant
Agreement. For more information about the form of the warrants, see
"Description of the Notes Book Entry, Delivery and Form" and "-- Certificated
Securities."

General

     Each warrant, when exercised, will entitle the holder to purchase
approximately 5.7 shares of common stock from Splitrock at an exercise price of
$0.02 per share. The exercise price and the number of shares of common stock
issuable upon exercise of a warrant are both subject to adjustment. For more
information, see "-- Adjustments" below. The warrants initially entitled the
holders to acquire, in the aggregate, 1,487,791 shares of our common stock. As
of March 19, 2000 only 138,980 warrants remained outstanding, entitling their
holders to receive an aggregate of 792,235 shares of common stock upon exercise.

     As a result of a supplemental warrant agreement executed on February 24,
2000, Splitrock must, prior to any merger, issue the warrant shares underlying
the remaining outstanding warrants to the warrant agent to hold in custody for
the warrant holders and may do so, at its election, any time earlier. The
warrant agent will pay Splitrock a fee upon the issuance of the shares and
Splitrock will eliminate the exercise price to be paid by the warrant holders
when they exercise. Warrant holders will continue to exercise their warrants by
completing and sending the proper forms to the warrant agent in order to release
their warrant shares from the warrant agent's custody.

     The warrants became exercisable on July 26, 1999; however, the holders of
warrants will be able to exercise their warrants only if the Registration
Statement of which this prospectus is a part relating to the common stock
underlying the warrants is effective or the exercise of such warrants is exempt
from the registration requirements of the Securities Act, and such securities
are qualified for sale or exempt from qualification under the applicable
securities laws of the states or other jurisdictions in which such holders
reside. Unless earlier exercised, the warrants will expire on the Expiration
Date of July 15, 2008. Splitrock will give notice of expiration not less than 90
nor

                                       25
<PAGE>

more than 120 days before the Expiration Date to the registered holders of
the then outstanding warrants. If Splitrock fails to give such notice, the
warrants will nevertheless expire and become void on the Expiration Date.  If
Splitrock elects to issue the warrant shares to the custody of the warrant
agent,  the warrant agent will return any warrant shares not yet transferred to
holders upon the Expiration Date to Splitrock to be transferred to the holders
who failed to exercise their warrants.

     At our option, fractional shares of common stock may not be issued upon
exercise of the warrants. If any fraction of a share of common stock would,
except for the foregoing provision, be issuable upon the exercise of any such
warrant (or specified portion thereof), we will pay an amount in cash equal to
the Current Market Value per share of common stock, as determined on the day
immediately preceding the date the warrant is presented for exercise, multiplied
by such fraction, computed to the nearest whole cent.

     Certificates for warrants will be issued in fully registered form only. No
service charge will be made for registration of transfer or exchange upon
surrender of any warrant certificate at the office of the warrant agent
maintained for that purpose. We may require payment of a sum sufficient to cover
any tax or other governmental charge that may be imposed in connection with any
registration of transfer or exchange of warrant certificates.

     In the event a bankruptcy, reorganization or similar proceeding is
commenced by or against Splitrock, a bankruptcy court may hold that unexercised
warrants are executory contracts which may be subject to rejection by Splitrock
with approval of the bankruptcy court. As a result, holders of the warrants may,
even if sufficient funds are available, not be entitled to receive any
consideration or may receive an amount less than they would be entitled to if
they had exercised their warrants prior to the commencement of any such
bankruptcy, reorganization or similar proceeding.

Certain Terms

Exercise

     In order to exercise all or any of the warrants, the holder thereof is
required to surrender to the warrant agent the related warrant certificate and,
if prior to Splitrock's issuance of the warrant shares to the warrant agent as
custodian for the holders, to pay in full the exercise price for each share of
common stock or other securities issuable upon exercise of such warrants. If
Splitrock elects to issue the warrant shares to the warrant agent, then the
holders need not remit an exercise price. The exercise price may be paid (i) in
cash or by certified or official bank check or by wire transfer to an account
designated by Splitrock for such purpose or (ii) without the payment of cash, by
reducing the number of shares of common stock that would be obtainable upon the
exercise of a warrant and payment of the exercise price in cash so as to yield a
number of shares of common stock upon the exercise of such warrant equal to the
product of (a) the number of shares of common stock for which such warrant is
exercisable as of the date of exercise (if the exercise price were being paid in
cash) and (b) the Cashless Exercise Ratio. This second method is a "Cashless
Exercise". The "Cashless Exercise Ratio" shall equal a fraction, the
numerator of which is the excess of the Current Market Value per share of common
stock on the exercise date over the exercise price per share as of the exercise
date and the denominator of which is the Current Market Value per share of the
common stock on the exercise date. Upon surrender of a warrant certificate
representing more than one warrant in connection with the holder's option to
elect a Cashless Exercise, the number of shares of common stock deliverable upon
a Cashless Exercise shall be equal to the number of shares of common stock
issuable upon the exercise of warrants that the holder specifies are to be
exercised pursuant to a Cashless Exercise multiplied by the Cashless Exercise
Ratio. All provisions of the Warrant Agreement shall be applicable with respect
to a surrender of a warrant certificate pursuant to a Cashless Exercise for less
than the full number of warrants represented thereby.

Rights as Stockholders

     Before Splitrock issues the warrant shares into custody, the holders of
unexercised warrants are not entitled, by virtue of being such holders, to
receive dividends, to vote, to consent, to exercise any preemptive rights or to
receive notice as stockholders of Splitrock in respect of any stockholders'
meeting for the election of directors of Splitrock or any other purpose, or to
exercise any other rights whatsoever as stockholders of Splitrock. After
Splitrock issues

                                       26
<PAGE>

the warrant shares to the warrant agent, the holders of unexercised warrants
will be entitled to instruct the warrant agent how to vote the warrant shares
underlying their warrants in any meeting of stockholders and will continue to
benefit from the anti-dilution protections in the warrant agreement until the
time they exercise their warrants. The holders will also be entitled to receive
directly from Splitrock any dividends or distributions paid directly to holders
of our common stock and notice of any stockholders' meeting with a record date
on or after the date of issuance of the warrant shares.

Mergers, Consolidations, etc.

     If Splitrock consolidates with, merges with or into, or sells all or
substantially all of its assets to, another Person, each warrant thereafter will
entitle the holder thereof to receive upon exercise thereof, per share of common
stock for which such warrant is exercisable, the number of shares of common
stock or other securities or property which the holder of a share of common
stock is entitled to receive upon completion of such consolidation, merger or
sale of assets. However, if (i) Splitrock consolidates with, merges with or
into, or sells all or substantially all of its assets to, another Person and, in
connection therewith, the consideration payable to the holders of common stock
in exchange for their shares is payable solely in cash or (ii) there is a
dissolution, liquidation or winding-up of Splitrock, then the holders of the
warrants will be entitled to receive distributions on an equal basis with the
holders of common stock or other securities issuable upon exercise of the
warrants, as if the warrants had been exercised immediately prior to such event,
less the exercise price. Upon receipt of such payment, if any, the warrants will
expire and the rights of the holders thereof will cease. In the case of any such
merger, consolidation or sale of assets, the surviving or acquiring person and,
in the event of any dissolution, liquidation or winding-up of Splitrock,
Splitrock, must deposit promptly with the warrant agent the funds, if any,
required to pay the holders of the warrants. After such funds and the
surrendered warrant certificates are received, the warrant agent is required to
deliver a check in such amount as is appropriate (or, in the case of
consideration other than cash, such other consideration as is appropriate) to
such Persons as it may be directed in writing by the holders surrendering such
warrants.

     As a result of the merger, each warrant to receive shares of Splitrock
common stock would become a right to receive a number of shares of McLeodUSA
Class A common stock equal to the number of Splitrock shares underlying the
Splitrock warrant multiplied by 0.5347. Once Splitrock has issued the warrant
shares to the warrant agent to hold in custody for the benefit of the warrant
holders, after the merger, McLeodUSA will issue a number of shares of McLeodUSA
Class A common stock equal to the number of shares underlying the warrants as a
result of the merger to the warrant agent to hold in custody for the benefit of
the warrant holders. McLeodUSA has agreed to use its reasonable best efforts to
cause its Class A common stock subject to the warrants as a result of the merger
to be registered under the Securities Act in accordance with the terms of the
Warrant Agreement. McLeodUSA has also agreed to use its reasonable best efforts
to cause the effectiveness of the registration statement registering these
shares to be maintained in accordance with the terms of the Warrant Agreement
for as long as warrants remain outstanding. See "Recent Developments."

Adjustments

     The number of shares of common stock issuable upon the exercise of the
warrants and the exercise price will be subject to adjustment in certain events
including: (i) the payment by us of certain dividends (or other distributions)
on our common stock including dividends or distributions payable in shares of
common stock or other shares of our capital stock, (ii) subdivisions,
combinations and certain reclassifications to the common stock, (iii) the
issuance to all holders of common stock of rights, options or warrants entitling
them to subscribe for shares of common stock, or of securities convertible into
or exchangeable or exercisable for shares of common stock, for a consideration
per share which is less than the Current Market Value per share of the common
stock, (iv) the issuance of shares of common stock for a consideration per share
which is less than the Current Market Value per share of the common stock, and
(v) the distribution to all holders of the common stock of any of our assets,
debt securities or any rights or warrants to purchase securities (excluding
those rights and warrants referred to in the foregoing clause (iii) and cash
dividends and other cash distributions from current or retained earnings other
than any Extraordinary Cash Dividend). No adjustment to the number of shares of
common stock issuable upon the exercise of the warrants and the exercise price
will be required in certain events including: (i) the issuance of shares of
common stock in bona

                                       27
<PAGE>

fide public offerings that are underwritten or in which a placement agent is
retained by us, (ii) the issuance of shares of common stock (including upon
exercise of options) pursuant to the terms of and in order to give effect to the
1997 Incentive Share Plan and (iii) the issuance of shares of common stock in
connection with acquisitions other than to affiliates of Splitrock.

     In the event of a distribution to holders of common stock which results in
an adjustment to the number of shares of common stock or other consideration for
which a warrant may be exercised, the holders of the warrants may, in certain
circumstances, be deemed to have received a distribution subject to United
States Federal income tax as a dividend. For more information, see "Certain
Federal Income Tax Considerations".

     No adjustment in the exercise price will be required unless such adjustment
would require an increase or decrease of at least one percent in the exercise
price; provided, however, that any adjustment which is not made as a result oft
his paragraph will be carried forward and taken into account in any subsequent
adjustment.

Amendment

     From time to time, Splitrock and the warrant agent, without the consent of
the holders of the warrants, may amend or supplement the Warrant Agreement for
certain purposes, including curing defects or inconsistencies or making any
change that does not adversely affect the rights of any holder. Any amendment or
supplement to the Warrant Agreement that has an adverse effect on the interests
of the holders of the warrants shall require the written consent of the holders
of a majority of the then outstanding warrants. The consent of each holder of
the warrants affected shall be required for any amendment pursuant to which the
exercise price would be increased or the number of shares of common stock
issuable upon exercise of warrants would be decreased (other than pursuant to
adjustments provided in the Warrant Agreement).

Registration Rights

     Registration of warrants.  The Company is required under the Warrant
Agreement to file a shelf registration statement under the Securities Act
covering the resale of the warrants by the holders thereof (the "Warrant Shelf
Registration Statement") within 45 days after the Issue Date and to use its
best efforts to cause the Warrant Shelf Registration Statement to be declared
effective under the Securities Act within 105 days after the date of original
issuance of the warrants and to remain effective until the earliest of (i) such
time as all of the warrants have been sold thereunder, (ii) two years after its
effective date and (iii) such time as the warrants can be sold without
restriction under the Securities Act. This prospectus constitutes a part of the
Warrant Shelf Registration Statement that we filed.

     Each holder of warrants that sells such warrants pursuant to the Warrant
Shelf Registration Statement is required to be named as a selling security
holder in the prospectus and to deliver the prospectus to the purchaser, is
subject to certain of the civil liability provisions under the Securities Act in
connection with such sales and is bound by certain provisions of the Warrant
Agreement which are applicable to such holder (including certain indemnification
obligations). In addition, each holder of warrants is required to deliver
information to be used in connection with the Warrant Shelf Registration
Statement in order to have its warrants included in the Warrant Shelf
Registration Statement.

     Registration of Underlying Common Stock.  The Company is required under the
Warrant Agreement to file a shelf registration statement under the Securities
Act covering the issuance of shares of common stock to the holders of the
warrants upon exercise of the warrants by the holders thereof (the "Common
Shelf Registration Statement") and to use its best efforts to cause the Common
Shelf Registration Statement to be declared effective on or before 365 days
after the Issue Date and to remain effective until the earlier of (i) such time
as all warrants have been exercised and (ii) the Expiration Date. The Common
Shelf Registration Statement and the Warrant Shelf Registration Statement have
been filed by the Company as a single registration statement (the "Shelf
Registration Statement"), of which this prospectus constitutes a part.

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<PAGE>

     During any consecutive 365-day period, the Company shall be entitled to
suspend the availability of the Shelf Registration Statement for up to two 45
consecutive-day periods (except for the 45 consecutive-day period immediately
prior to the Expiration Date) if our board of directors determines in the
exercise of its reasonable judgment that there is a valid business purpose for
such suspension and provides notice that such determination was made to the
holders of the warrants and the notes; provided, however, that in no event shall
we be required to disclose the business purpose for such suspension if we
determine in good faith that such business purpose must remain confidential.
There can be no assurance that we will be able to keep a registration statement
continuously effective until all of the warrants have been exercised or have
expired.

Certain Definitions

     The Warrant Agreement contains, among others, the following definitions:

     "Current Market Value" per share of common stock or any other security at
any date means (i) if the security is not registered under the Exchange Act, (a)
the value of the security, determined in good faith by our board of directors
and certified in a board resolution, based on the most recently completed arm's-
length transaction between Splitrock and a Person other than an Affiliate of
Splitrock, the closing of which shall have occurred on such date or within the
six-month period preceding such date, or (b) if no such transaction shall have
occurred on such date or within such six-month period ,the value of the security
as determined by a nationally recognized investment banking firm or (ii) if the
security is registered under the Exchange Act, the average of the daily closing
bid prices (or the equivalent in an over-the-counter market) for each Business
Day during the period commencing 15 Business Days before such date and ending on
the date one day prior to such date, or if the security has been registered
under the Exchange Act for less than 15 consecutive Business Days before such
date, then the average of the daily closing bid prices (or such equivalent) for
all of the Business Days before such date for which daily closing bid prices are
available; provided, however, that if the closing bid price is not determinable
for at least ten Business Days in such period, the "Current Market Value" of
the security shall be determined as if the security were not registered under
the Exchange Act.

     "Issue Date" means July 24, 1998.

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

                            DESCRIPTION OF THE NOTES

General

     The notes were issued under an indenture dated as of July 24, 1998, between
Splitrock and Bank of Montreal Trust Company, as trustee, a copy of which has
been filed as an exhibit to the Registration Statement. We refer to the
indenture, as supplemented from time to time, as the "Indenture." The notes
and all other 11 3/4% Series B Senior notes due 2008 issued by Splitrock are
deemed the same class of notes under the Indenture and are entitled to the
benefits thereof. Whenever particular sections or defined terms of the Indenture
not otherwise defined herein are referred to, such sections or defined terms are
incorporated herein by reference.

     The following summary of certain provisions of the Indenture, the notes and
the Escrow and Disbursement Agreement does not purport to be complete and is
subject to, and is qualified in its entirety by reference to, all the provisions
of the Indenture, including the definitions of certain terms therein and those
terms made a part thereof by the Trust Indenture Act of 1939, as amended, and
the Escrow and Disbursement Agreement. Capitalized terms used herein and not
otherwise defined have the meanings set forth in the section "-- Certain
Definitions."

     The Indenture provides for the issuance of up to $50.0 million aggregate
principal amount of additional notes having identical terms and conditions to
the notes offered hereby and the notes issued in the Exchange Offer, subject to
compliance with the covenants contained in the Indenture. Any additional notes
will be part of the same

                                       29
<PAGE>

issue as the notes offered hereby and the notes issued in the Exchange Offer and
will vote on all matters with the notes offered hereby and the notes issued in
the Exchange Offer.

     Principal of, premium, if any, and interest on the notes is payable, and
the notes may be exchanged or transferred, at the office or agency of the
Company in the Borough of Manhattan, The City of New York (which initially shall
be the corporate trust office of the Trustee, at 88 Pine Street, 19th Floor, New
York, New York 10005), except that, at the option of the Company, payment of
interest may be made by check mailed to the registered holders of the notes at
their registered addresses.

     The notes will be issued only in fully registered form, without coupons, in
denominations of $1,000 and any integral multiple of $1,000. No service charge
will be made for any registration of transfer or exchange of notes, but the
Company may require payment of a sum sufficient to cover any transfer tax or
other similar governmental charge payable in connection therewith.

Recent Amendments to the Indenture

     On November 22, 1999, Splitrock received consents from note holders
representing a majority of the outstanding principal amount of the notes to
amend the Indenture.  Specifically, it amended the definition of "Purchase Money
Indebtedness" by eliminating the requirement that this indebtedness be solely
with recourse to the assets acquired, so that a lender of Purchase Money
Indebtedness need not forego any unsecured claim it would otherwise have against
Splitrock. The requirement effectively precluded capital lease arrangements or
other full recourse vendor financing arrangements from qualifying as Purchase
Money Indebtedness under the Indenture. The amendment did not affect either of
the other two of requirements for Purchase Money Indebtedness - i.e., the Lien
securing the Purchase Money Indebtedness will not extend beyond the acquired
assets, and the amount of indebtedness will not be increased.

     On December 22, 1999, Splitrock's subsidiary, Splitrock Leasing LLC,
executed a supplemental indenture to  become a subsidiary guarantor of the
notes.  Splitrock Holdings, Inc. and Splitrock Merger Sub, Inc. will also
execute similar supplemental indentures to become subsidiary guarantors in the
event that they Incur Indebtedness (as defined in the Indenture).

Terms of the Notes

     The notes are senior obligations of the Company and will mature on July 15,
2008. Each note will bear interest at a rate per annum shown on the front cover
of this prospectus from July 24, 1998, or from the most recent date to which
interest has been paid or provided for, payable semiannually to holders of
record at the close of business on the January 1 or July 1 immediately preceding
the interest payment date on January 15 and July 15 of each year, commencing
January 15, 1999.  Interest payments on the notes were paid on January 15, 1999,
July 15, 1999 and January 15, 2000.

Disbursement of Funds; Escrow Account

     As of March 1, 2000 approximately $15.1 million in temporary cash
investments, remained of the original $56.8 million we deposited with an escrow
agent that, together with the interest received thereon, is sufficient to pay
the semi-annual interest payment on the notes due July 15, 2000. Such amounts
are deposited in an escrow account held by the Escrow Agent for the benefit of
the Trustee under the Indenture in accordance with the Escrow and Disbursement
Agreement. The Company entered into the Escrow and Disbursement Agreement, which
provides, among other things, that funds maybe disbursed from the Escrow Account
only to pay interest on the notes (or, if a portion of the notes has been
retired by us, funds representing the interest payment on the retired notes may
be paid to Splitrock). Funds were disbursed to make interest payments on January
15, 2000 and January 15, and July 15, 1999. Pending such disbursement, we will
cause all funds contained in the Escrow Account to be invested in temporary cash
investments. Interest earned on these temporary cash investments will be added
to the Escrow Account.

                                       30
<PAGE>

     Under the Escrow and Disbursement Agreement, Splitrock will grant to the
Trustee, for the benefit of the holders, a first priority and exclusive security
interest in the Escrow Account. We refer to that interest as the "Escrow
Collateral". The Escrow and Disbursement Agreement will provide that the
Trustee may foreclose on the Escrow Collateral upon acceleration of the maturity
of the notes. Under the terms of the Indenture, the proceeds of the Escrow
Collateral will be applied, first, to amounts owing to the Escrow Agent in
respect of fees and expenses of the Escrow Agent, and second, to the obligations
of Splitrock to the holders under the notes and the Indenture. The ability of
holders to realize upon the Escrow Collateral may be subject to certain
bankruptcy law limitations in the event of the bankruptcy of Splitrock.

     Upon payment in full of the first four scheduled semi-annual payments on
the notes, if no Default or Event of Default has occurred and is continuing, the
Escrow Collateral, if any, then remaining will be released to Splitrock.

Optional Redemption

     Except as set forth in the following paragraph, the notes will not be
redeemable at our option prior to July 15, 2003. On or after such date, the
notes will be redeemable at our option, in whole or in part, on not less than 30
nor more than 60 days prior notice, at the following redemption prices
(expressed as percentages of principal amount), plus accrued and unpaid interest
and liquidated damages (if any) to the redemption date (subject to the right of
holders of record on the relevant record date to receive interest due on the
relevant interest payment date), if redeemed during the 12-month period
commencing on July 15 of the years set forth below:

          Year                                        Redemption Price
          ----                                        ----------------
          2003.............................                105.875%
          2004.............................                103.917%
          2005.............................                101.958%
          2006 and thereafter..............                100.000%

     In addition, at any time and from time to time prior to July 15, 2001,
Splitrock may redeem up to a maximum of 35% of the original aggregate principal
amount of the notes (calculated giving effect to the notes issued in the
Exchange Offering and any issuance of additional notes) with the Net Cash
Proceeds of one or more Equity Offerings by Splitrock, at a redemption price
equal to 111.75% of the principal amount thereof, plus accrued and unpaid
interest and liquidated damages, if any, to date of redemption (subject to the
right of holders of record on the relevant record date to receive interest due
on the relevant interest payment date); provided, however, that at least 65% of
the original aggregate principal amount of the notes remains outstanding
immediately after each such redemption (calculated giving effect to the notes
issued in the Exchange Offering and any issuance of additional notes). Any such
redemption shall be made within 60 days of such Equity Offering upon not less
than 30 nor more than 60 days notice mailed to each holder of notes being
redeemed and otherwise in accordance with the procedures set forth in the
Indenture.

Selection

     In the case of any partial redemption, selection of the notes for
redemption will be made by the Trustee on a pro rata basis, by lot or by such
other method as the Trustee in its sole discretion shall deem to be fair and
appropriate, although no Note of $1,000 in original principal amount or less
will be redeemed in part. If any note is to be redeemed in part only, the notice
of redemption relating to such note shall state the portion of the principal
amount thereof to be redeemed. A new note in principal amount equal to the
unredeemed portion thereof will be issued in the name of the holder thereof upon
cancellation of the original note.

Ranking

     The indebtedness evidenced by the notes will be unsecured Senior
Indebtedness of Splitrock, will rank pari passu in right of payment with all our
existing and future Senior Indebtedness and will be senior in right of payment
to all our existing and future Subordinated Obligations, which must be
specifically designated as subordinate to the

                                       31
<PAGE>

notes. The notes will also be effectively subordinated to any Secured
Indebtedness of Splitrock and its subsidiaries to the extent of the value of the
assets securing such Indebtedness.

  At December 31, 1999, Splitrock had $40 million of Indebtedness other than the
notes all of which is senior indebtedness and all of which is secured. We
currently have three Subsidiaries, only one of which has Incurred Indebtedness
and become a subsidiary guarantor. The others will become subsidiary guarantors
in the event they Incur Indebtedness.

  Although the Indenture contains limitations on the amount of additional
Indebtedness that we may incur, under certain circumstances the amount of such
Indebtedness could be substantial and, in any case, such Indebtedness may be
Senior Indebtedness. For more information see ''-- Certain Covenants --
Limitation on Indebtedness.''


Change of Control

  Upon the occurrence of any of the following events, each a ''Change of
Control'', each holder will have the right to require us to repurchase all or
any part of such holder's notes at a purchase price in cash equal to 101% of the
principal amount thereof plus accrued and unpaid interest and liquidated
damages, if any, to the date of repurchase (subject to the right of holders of
record on the relevant record date to receive interest due on the relevant
interest payment date); provided, however, that notwithstanding the occurrence
of a Change of Control, we shall not be obligated to repurchase the notes
pursuant thereto if it has exercised its right to redeem all the notes under the
terms of the section titled ''Optional Redemption'':

  (1) prior to our first public offering of common stock, the Permitted Holders
      cease to be the ''beneficial owner'' (as defined in Rules 13d-3 and 13d-5
      under the Exchange Act), directly or indirectly, of a majority in the
      aggregate of the total voting power of the Voting Stock of Splitrock,
      whether as a result of issuance of securities of Splitrock, any merger,
      consolidation, liquidation or dissolution of Splitrock, any direct or
      indirect transfer of securities by any Permitted Holder or otherwise (for
      purposes of this clause (1) and clause (2) below, the Permitted Holders
      shall be deemed to beneficially own any Voting Stock of an entity (the
      ''specified entity'') held by any other entity (the ''parent entity'') so
      long as the Permitted Holders beneficially own (as so defined), directly
      or indirectly, in the aggregate a majority of the voting power of the
      Voting Stock of the parent entity);

  (2) on the date of or after our first public offering of common stock referred
      in clause (1):

      (a) any ''person'' (as such term is used in Sections 13(d) and 14(d) of
          the Exchange Act), other than one or more Permitted Holders, is or
          becomes the beneficial owner (as defined in clause (1) above, except
          that for purposes of this clause (2) such person shall be deemed to
          have ''beneficial ownership'' of all shares that any such person has
          the right to acquire, whether such right is exercisable immediately or
          only after the passage of time), directly or indirectly, of more than
          35% of the total voting power of the Voting Stock of Splitrock, and

      (b) the Permitted Holders ''beneficially own'' (as defined in clause (1)
          above), directly or indirectly, in the aggregate a lesser percentage
          of the total voting power of the Voting Stock of Splitrock than such
          other person and do not have the right or ability by voting power,
          contract or otherwise to elect or designate for election a majority of
          our board of directors (for the purposes of this clause (2), such
          other person shall be deemed to beneficially own any Voting Stock of a
          specified entity held by a parent entity, if such other person is the
          beneficial owner (as defined in this clause (2)), directly or
          indirectly, of more than 35% of the voting power of the Voting Stock
          of such parent entity and the Permitted Holders ''beneficially own''
          (as defined in clause (1) above), directly or indirectly, in the
          aggregate a lesser percentage of the voting power of the Voting Stock
          of such parent entity and do not have the right or ability by voting
          power, contract or otherwise to elect or designate for election a
          majority of the board of directors of such parent entity);

  (3) during any period of two consecutive years, individuals who at the
      beginning of such period constituted our board of directors (together with
      any new directors whose election by such board of directors or

                                       32
<PAGE>

      whose nomination for election by the stockholders of Splitrock was
      approved by a vote of 66 2/3% of the directors of Splitrock then still in
      office who were either directors at the beginning of such period or whose
      election or nomination for election was previously so approved) cease for
      any reason to constitute a majority of our board of directors then in
      office;

  (4) the adoption of a plan relating to the liquidation or dissolution of
      Splitrock; or

  (5) the merger or consolidation of Splitrock with or into another Person or
      the merger of another Person with or into Splitrock, or the sale of all or
      substantially all the assets of Splitrock to another Person (other than a
      Person that is controlled by the Permitted Holders), and, in the case of
      any such merger or consolidation, the securities of Splitrock that are
      outstanding immediately prior to such transaction and which represent 100%
      of the aggregate voting power of the Voting Stock of Splitrock are changed
      into or exchanged for cash, securities or property, unless pursuant to
      such transaction such securities are changed into or exchanged for, in
      addition to any other consideration, securities of the surviving Person or
      transferee that represent immediately after such transaction, at least a
      majority of the aggregate voting power of the Voting Stock of the
      surviving Person or transferee.

  Within 30 days following any Change of Control, we shall mail a notice to each
holder with a copy to the Trustee (the ''Change of Control Offer'') stating:

  .   that a Change of Control has occurred and that such holder has the right
      to require us to purchase such holder's notes at a purchase price in cash
      equal to 101% of the principal amount thereof, plus accrued and unpaid
      interest and liquidated damages, if any, to the date of repurchase
      (subject to the right of holders of record on the relevant record date to
      receive interest on the relevant interest payment date);

  .   the circumstances and relevant facts and financial information regarding
      such Change of Control;

  .   the repurchase date (which shall be no earlier than 30 days nor later than
      60 days from the date such notice is mailed); and

  .   the instructions determined by us, consistent with this covenant, that a
      holder must follow in order to have its notes purchased.

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

  We will comply, to the extent applicable, with the requirements of Section
14(e) of the Exchange Act and any other securities laws or regulations in
connection with the repurchase of notes pursuant to this covenant. To the extent
that the provisions of any securities laws or regulations conflict with
provisions of this covenant, we will comply with the applicable securities laws
and regulations and will not be deemed to have breached its obligations under
this paragraph by virtue thereof.

  The Change of Control purchase feature is a result of negotiations between
Splitrock and Chase Securities, the Initial Purchaser. Management has no present
intention to engage in a transaction involving a Change of Control, although it
is possible that we would decide to do so in the future. Subject to the
limitations discussed below, we could, in the future, enter into certain
transactions, including acquisitions, refinancings or other recapitalizations,
that would not constitute a Change of Control under the Indenture, but that
could increase the amount of indebtedness outstanding at such time or otherwise
affect our capital structure or credit ratings. Restrictions on the ability of
Splitrock to incur additional Indebtedness are contained in the covenants
described under ''Certain Covenants -- Limitation on Indebtedness'', ''Certain
Covenants -- Limitation on Liens'' and ''Certain Covenants -- Limitation on
Sale/Leaseback Transactions''. Such restrictions can only be waived with the
consent of the holders of a majority in principal amount of the notes then
outstanding. Except for the limitations contained in such covenants, however,
the Indenture will not contain any covenants or provisions that may afford
holders of the notes protection in the event of a highly leveraged transaction.

                                       33
<PAGE>

  Our future Senior Indebtedness may contain prohibitions of certain events
which would constitute a Change of Control or require such Senior Indebtedness
to be repurchased upon a Change of Control. Moreover, the exercise by the
holders of their right to require us to repurchase the notes could cause a
default under such Senior Indebtedness, even if the Change of Control itself
does not, due to the financial effect of such repurchase on Splitrock. Finally,
our ability to pay cash to the holders upon a repurchase may be limited by our
then existing financial resources. There can be no assurance that sufficient
funds will be available when necessary to make any required repurchases. The
provisions under the Indenture relative to our obligation to make an offer to
repurchase the notes as a result of a Change of Control may be waived or
modified with the written consent of the holders of a majority in principal
amount of the notes.

  Consummation of the merger will trigger a change in control of Splitrock.
McLeodUSA has agreed that it will cause us to comply with the provisions in the
Indenture relating to a Change in Control Offer if the merger is completed.

Certain Covenants

  The following restrictions apply to the notes:

  Limitation on Indebtedness.  (a) We will not, and will not permit any
Restricted Subsidiary to, Incur, directly or indirectly, any Indebtedness;
provided, however, that we may Incur Indebtedness if on the date of such
Incurrence and after giving effect thereto the Debt to Annualized Operating Cash
Flow Ratio would be less than or equal to 6.0:1.0 if such Indebtedness is
Incurred prior to July 15, 2001 and less than or equal to 5.5:1.0 if such
Indebtedness is Incurred on or after such date.

  (b) Notwithstanding the foregoing paragraph, Splitrock and its Restricted
Subsidiaries may Incur the following Indebtedness:

  (1) Bank Indebtedness in an aggregate principal amount not to exceed $75.0
      million less the aggregate amount of all repayments of principal applied
      to permanently reduce any such Indebtedness;

  (2)  Indebtedness of Splitrock owed to and held by any Wholly Owned Subsidiary
       or Indebtedness of a Restricted Subsidiary owed to and held by Splitrock
       or any Wholly Owned Subsidiary; provided, however, that

       .  any subsequent issuance or transfer of any Capital Stock or any other
          event that results in any such Wholly Owned Subsidiary ceasing to be a
          Wholly Owned Subsidiary or any subsequent transfer of any such
          Indebtedness (except to Splitrock or a Wholly Owned Subsidiary) shall
          be deemed, in each case, to constitute the Incurrence of such
          Indebtedness by the issuer thereof and

       .  if Splitrock is the obligor on such Indebtedness, such Indebtedness is
          expressly subordinated to the prior payment in full in cash of all
          obligations with respect to the notes;

  (3)  Indebtedness:

       .  represented by the notes (not including any additional notes),

       .  outstanding on the Closing Date (other than the Indebtedness described
          in clauses (1) and (2) above),

       .  consisting of Refinancing Indebtedness Incurred in respect of any
          Indebtedness described in this clause (3) (including Indebtedness
          Refinancing) or the foregoing paragraph (a),

       .  consisting of Guarantees of any Indebtedness permitted under clauses
          (1) and (2) of this paragraph (b) and

       .  consisting of any Guarantees of the notes;

                                       34
<PAGE>

  (4)  Indebtedness of a Restricted Subsidiary Incurred and outstanding on or
       prior to the date on which such Restricted Subsidiary was acquired by us
       (other than Indebtedness Incurred as consideration in, or to provide all
       or any portion of the funds or credit support utilized to consummate, the
       transaction or series of related transactions pursuant to which such
       Restricted Subsidiary became a Subsidiary of or was otherwise acquired by
       us); provided, however, that on the date that such Restricted Subsidiary
       is acquired by us, we would have been able to Incur $1.00 of additional
       Indebtedness pursuant to the foregoing paragraph (a) after giving effect
       to the Incurrence of such Indebtedness pursuant to this clause (4);and
       refinancing Indebtedness Incurred by a Restricted Subsidiary in respect
       of Indebtedness Incurred by such Restricted Subsidiary pursuant to this
       clause (4);

  (5)  Indebtedness

       .  in respect of performance bonds, bankers' acceptances, letters of
          credit and surety or appeal bonds provided by the Company and the
          Restricted Subsidiaries in the ordinary course of their business, and

       .  under Hedging Obligations entered into for bona fide hedging purposes
          of the Company in the ordinary course of business; provided, however,
          that such Hedging Obligations do not increase the Indebtedness of the
          Company outstanding at any time other than as a result of fluctuations
          in interest rates or currency exchange rates or by reason of fees,
          indemnities and compensation payable thereunder;

  (6)  Purchase Money Indebtedness, provided that the amount of such Purchase
       Money Indebtedness does not exceed the lesser of (a) the Fair Market
       Value of or (b) the cost of the construction, installation, acquisition,
       lease, development or improvement of, the applicable Telecommunications
       Assets;

  (7)  Contribution Indebtedness; or

  (8)  Indebtedness (other than Indebtedness permitted to be Incurred pursuant
       to the foregoing paragraph (a) or any other clause of this paragraph (b))
       in an aggregate principal amount on the date of Incurrence that, when
       added to all other Indebtedness Incurred pursuant to this clause (8) and
       then outstanding, shall not exceed $40.0 million.

  (c)  Notwithstanding the foregoing, we may not Incur any Indebtedness pursuant
to paragraph (b) above if the proceeds thereof are used, directly or indirectly,
to repay, prepay, redeem, defease, retire, refund or refinance any Subordinated
Obligations unless such Indebtedness will be subordinated to the notes to at
least the same extent as such Subordinated Obligations.

  (d)  Notwithstanding any other provision of this covenant, the maximum amount
of Indebtedness that we or any Restricted Subsidiary may Incur pursuant to this
covenant shall not be deemed to be exceeded solely as a result of fluctuations
in the exchange rates of currencies. For purposes of determining the outstanding
principal amount of any particular Indebtedness Incurred pursuant to this
covenant, (i) Indebtedness permitted by this covenant need not be permitted
solely by reference to one provision permitting such Indebtedness but may be
permitted in part by one such provision and in part by one or more other
provisions of this covenant permitting such Indebtedness and (ii) in the event
that Indebtedness meets the criteria of more than one of the types of
Indebtedness described in this covenant, Splitrock, in its sole discretion,
shall classify such Indebtedness and only be required to include the amount of
such Indebtedness in one of such clauses. Once so classified, such Indebtedness
shall retain such classification until repaid.

  Limitation on Restricted Payments.  a) Splitrock will not, and will not
permit any Restricted Subsidiary, directly or indirectly, to:

  (1)  declare or pay any dividend or make any distribution on or in respect of
       its Capital Stock (including any payment in connection with any merger or
       consolidation involving Splitrock) or similar payment to the direct or
       indirect holders of its Capital Stock except dividends or distributions
       payable solely in its Capital

                                       35
<PAGE>

       Stock (other than Disqualified Stock) and except dividends or
       distributions payable to Splitrock or another Restricted Subsidiary (and,
       if such Restricted Subsidiary has stockholders other than Splitrock or
       other Restricted Subsidiaries, to its other stockholders on a pro rata
       basis);

  (2)  purchase, redeem, retire or otherwise acquire for value any Capital Stock
       of Splitrock or any Restricted Subsidiary held by Persons other than
       Splitrock or another Restricted Subsidiary;

  (3)  purchase, repurchase, redeem, defease or otherwise acquire or retire for
       value, prior to scheduled maturity, scheduled repayment or scheduled
       sinking fund payment any Subordinated Obligations (other than the
       purchase, repurchase or other acquisition of Subordinated Obligations
       purchased in anticipation of satisfying a sinking fund obligation,
       principal installment or final maturity, in each case due within one year
       of the date of acquisition) or

  (4)  make any Investment (other than a Permitted Investment) in any Person

(any such dividend, distribution, purchase, redemption, repurchase, defeasance,
other acquisition, retirement or Investment being herein referred to as a
"Restricted Payment") if at the time Splitrock or such Restricted Subsidiary
makes such Restricted Payment:

  (1)  a Default will have occurred and be continuing (or would result
       therefrom);

  (2)  Splitrock could not Incur at least $1.00 of additional Indebtedness under
       paragraph (a) of the covenant described under ''-- Limitation on
       Indebtedness''; or

  (3)  the aggregate amount of such Restricted Payment and all other Restricted
       Payments (the amount so expended, if other than in cash, to be determined
       in good faith by our board of directors, whose determination will be
       conclusive and evidenced by a resolution of our board of directors)
       declared or made subsequent to the Closing Date would exceed the sum of:

       (A) (i) 100% of Consolidated Operating Cash Flow accrued during the
           period(treated as one accounting period) from the beginning of the
           fiscal quarter immediately following the fiscal quarter during which
           the Closing Date occurs to the end of the most recent fiscal quarter
           ending at least 45 days prior to the date of such Restricted Payment
           (or, in case such Consolidated Operating Cash Flow during such period
           is a deficit, minus 100% of such deficit), minus (ii)150% of
           Consolidated Interest Expense accrued during the period (treated as
           one accounting period) from the beginning of the fiscal quarter
           immediately following the fiscal quarter during which the Closing
           Date occurs to the end of the most recent fiscal quarter ending at
           least 45 days prior to the date of such Restricted Payment; plus,

       (B) the aggregate Net Cash Proceeds received by us from the issue or sale
           of our Capital Stock (other than Disqualified Stock) subsequent to
           the Closing Date (other than an issuance or sale to (x) a Subsidiary
           of Splitrock or (y) an employee stock ownership plan or other trust
           established by Splitrock or any of its Subsidiaries); plus,

       (C) the amount by which Indebtedness of Splitrock or its Restricted
           Subsidiaries is reduced on Splitrock's balance sheet upon the
           conversion or exchange (other than by a Subsidiary of Splitrock)
           subsequent to the Closing Date of any Indebtedness of Splitrock or
           its Restricted Subsidiaries issued after the Closing Date which is
           convertible or exchangeable for Capital Stock (other than
           Disqualified Stock)of Splitrock (less the amount of any cash or the
           fair market value of other property distributed by Splitrock or any
           Restricted Subsidiary upon such conversion or exchange); plus

       (D) the amount equal to the net reduction in Investments in Unrestricted
           Subsidiaries resulting from (i) payments of dividends, repayments of
           the principal of loans or advances or other transfers of assets to
           Splitrock or any Restricted Subsidiary from Unrestricted Subsidiaries
           or (ii) the redesignation of Unrestricted Subsidiaries as Restricted
           Subsidiaries (valued in each case as provided in the definition of
           ''Investment'') not to exceed, in the case of any Unrestricted
           Subsidiary, the amount of Investments

                                       36
<PAGE>

           previously made by Splitrock or any Restricted Subsidiary in such
           Unrestricted Subsidiary, which amount was included in the calculation
           of the amount of Restricted Payments; and less,

       (E) the aggregate principal amount of any outstanding Contribution
            Indebtedness or, if less, the Cash Contribution Amount.

  (b) The provisions of the foregoing paragraph (a) will not prohibit:

  (1) any purchase, repurchase, retirement or other acquisition or retirement
      for value of Capital Stock of Splitrock made by exchange for, or out of
      the proceeds of the substantially concurrent sale of, Capital Stock of
      Splitrock (oher than Disqualified Stock and other than Capital Stock
      issued or sold to a Subsidiary of Splitrock or an employee stock ownership
      plan or other trust established by Splitrock or any of its Subsidiaries);
      provided, however, that such purchase, repurchase, retirement or other
      acquisition or retirement for value will be excluded in the calculation of
      the amount of Restricted Payments;

  (2) any purchase, repurchase, redemption, defeasance or other acquisition or
      retirement for value of Subordinated Obligations of Splitrock made by
      exchange for, or out of the proceeds of the substantially concurrent sale
      of, Indebtedness of Splitrock that is permitted to be Incurred pursuant to
      paragraph (b) of the covenant described under ''-- Limitation on
      Indebtedness'' or Capital Stock of Splitrock (other than Disqualified
      Stock and other than Capital Stock issued or sold to a Subsidiary of
      Splitrock or an employee stock ownership plan or other trust established
      by Splitrock or any of its Subsidiaries); provided, however, that such
      purchase, repurchase, redemption, defeasance or other acquisition or
      retirement for value will be excluded in the calculation of the amount of
      Restricted Payments;

  (3) any purchase or redemption of Subordinated Obligations from Net Available
      Cash to the extent permitted by the covenant described under ''--
      Limitation on Sales of Assets and Subsidiary Stock''; provided, however,
      that such purchase or redemption will in the calculation of the amount of
      Restricted Payments;

  (4) dividends paid within 60 days after the date of declaration thereof if at
      such date of declaration such dividend would have complied with this
      covenant; provided, however, that such dividend will be included in the
      calculation of the amount of Restricted Payments; or

  (5) the repurchase or other acquisition of shares of, or options to purchase
      shares of, common stock of Splitrock or any of its Subsidiaries from
      employees, former employees, directors or former directors of Splitrock or
      any of its Subsidiaries (or permitted transferees of such employees,
      former employees, directors or former directors), pursuant to the terms of
      agreements (including employment agreements) or plans (or amendments
      thereto) approved by our board of directors under which such individuals
      purchase or sell or are granted the option to purchase or sell, shares of
      such common stock; provided, however, that the aggregate amount of such
      repurchases shall not exceed $1.0 million in any calendar year and $3.0
      million in the aggregate; provided further, that such repurchases and
      other acquisitions shall be included in the calculation of the amount of
      Restricted Payments.

  Limitation on Restrictions on Distributions from Restricted Subsidiaries.
Splitrock will not, and will not permit any Restricted Subsidiary to, create or
otherwise cause or permit to exist or become effective any consensual
encumbrance or restriction on the ability of any Restricted Subsidiary to (a)
pay dividends or make any other distributions on its Capital Stock or pay any
Indebtedness or other obligations owed to Splitrock, (b) make any loans or
advances to Splitrock or (c) transfer any of its property or assets to
Splitrock, except:

  (1) any encumbrance or restriction pursuant to (A) an agreement in effect at
      or entered into on the Closing Date or (B) an agreement entered into in
      connection with the Incurrence of Indebtedness permitted under clause
      (b)(1) or (b)(6) of the covenant described under ''-- Limitation on
      Indebtedness'', provided that the chief financial officer of Splitrock has
      determined in good faith that any restriction incurred pursuant to this
      clause (B) is customary for similar Incurrences of Indebtedness;

  (2) any encumbrance or restriction with respect to a Restricted Subsidiary
      pursuant to an agreement relating to any Indebtedness Incurred by such
      Restricted Subsidiary prior to the date on which such Restricted

                                       37
<PAGE>

      Subsidiary was acquired by Splitrock (other than Indebtedness Incurred as
      consideration in, in contemplation of, or to provide all or any portion of
      the funds or credit support utilized to consummate the transaction or
      series of related transactions pursuant to which such Restricted
      Subsidiary became a Restricted Subsidiary or was otherwise acquired by
      Splitrock) and outstanding on such date;

  (3) any encumbrance or restriction pursuant to an agreement effecting a
      Refinancing of Indebtedness Incurred pursuant to an agreement referred to
      in clause (1) or (2) of this covenant or this clause (3) or contained in
      any amendment to an agreement referred to in clause (1) or (2) of this
      covenant or this clause (3); provided, however, that the encumbrances and
      restrictions contained in any such refinancing agreement or amendment are
      no less favorable to the Noteholders than the encumbrances and
      restrictions contained in such predecessor agreements;

  (4) in the case of clause (iii), any encumbrance or restriction (A) that
      restricts in a customary manner the subletting, assignment or transfer of
      any property or asset that is subject to a lease, license or similar
      contract, or (B) contained in security agreements securing Indebtedness of
      a Restricted Subsidiary to the extent such encumbrance or restriction
      restricts the transfer of the property subject to such security
      agreements; and

  (5) with respect to a Restricted Subsidiary, any restriction imposed pursuant
      to an agreement entered into for the sale or disposition of all or
      substantially all the Capital Stock or assets of such Restricted
      Subsidiary pending the closing of such sale or disposition.

  Limitation on Sales of Assets and Subsidiary Stock.   a) Splitrock will not,
and will not permit any Restricted Subsidiary to, make any Asset Disposition
unless:

  (1) Splitrock or such Restricted Subsidiary receives consideration (including
      by way of relief from, or by any other Person assuming sole responsibility
      for, any liabilities, contingent or otherwise) at the time of such Asset
      Disposition at least equal to the Fair Market Value of the shares and
      assets subject to such Asset Disposition;

  (2) at least 75% of the consideration thereof received by Splitrock or such
      Restricted Subsidiary is in the form of cash or cash equivalents and

  (3) an amount equal to 100% of the Net Available Cash from such Asset
      Disposition is applied by Splitrock (or such Restricted Subsidiary, as the
      case may be):

      (A) first, to the extent Splitrock elects (or is required by the terms of
          any Bank Indebtedness) to (x) reinvest in Telecommunications Assets
          (including by means of an Investment in Telecommunications Assets by a
          Restricted Subsidiary with Net Available Cash received by Splitrock or
          another Restricted Subsidiary) or (y) prepay, repay, redeem or
          purchase Bank Indebtedness of Splitrock Incurred pursuant to clause
          (b)(1) of the covenant described under ''-- Limitation on
          Indebtedness'', in each case within 180 days after the later of the
          date of such Asset Disposition or the receipt of such Net Available
          Cash;

     (B) second, to the extent of the balance of such Net Available Cash after
         application in accordance with clause (A), to make an Offer (as defined
         below) to purchase notes pursuant to and subject to the conditions set
         forth in section (b) of this covenant within 365 days after the later
         of such Asset Disposition or the receipt of such Net Available Cash;
         provided, however, that if Splitrock elects (or is required by the
         terms of any other Senior Indebtedness), such Offer may be made ratably
         to purchase the notes and other Senior Indebtedness of Splitrock; and

     (C) third, to fund (to the extent consistent with any other applicable
         provision in the Indenture) any corporate purpose.

  Notwithstanding the foregoing provisions of this covenant, Splitrock and the
Restricted Subsidiaries will not be required to apply any Net Available Cash in
accordance with this covenant except to the extent that the aggregate

                                       38
<PAGE>

Net Available Cash from all Asset Dispositions that is not applied in accordance
with this covenant exceeds $5.0 million.

  For the purposes of this covenant, the following are deemed to be cash: (x)
the assumption of Indebtedness of Splitrock (other than Disqualified Stock of
Splitrock) or any Restricted Subsidiary and the release of Splitrock or such
Restricted Subsidiary from all liability on such Indebtedness in connection with
such Asset Disposition and (y) securities received by Splitrock or any
Restricted Subsidiary from the transferee that are converted by Splitrock or
such Restricted Subsidiary into cash within 60 days of such receipt.

  (b) In the event of an Asset Disposition that requires the purchase of notes
(and other Senior Indebtedness) pursuant to clause (a)(3)(B) of this covenant,
Splitrock will be required to purchase notes (and other Senior Indebtedness)
tendered pursuant to an offer by Splitrock for the notes (and other Senior
Indebtedness) (the ''Offer'') at a purchase price of 100% of their principal
amount plus accrued and unpaid interest and liquidated damages, if any, to the
date of purchase in accordance with the procedures (including prorating in the
event of over subscription), set forth in the Indenture. If the aggregate
purchase price of notes (and other Senior Indebtedness) tendered pursuant to the
Offer is less than the Net Available Cash allotted to the purchase of the notes
(and other Senior Indebtedness), Splitrock may apply the remaining Net Available
Cash in accordance with clause (a)(3)(C) of this covenant. Splitrock will not be
required to make an Offer for notes (and other Senior Indebtedness) pursuant to
this covenant if the Net Available Cash available therefor (after application of
the proceeds as provided in clause(a)(3)(A)) is less than $5.0 million for any
particular Asset Disposition (which lesser amount will be carried forward for
purposes of determining whether an Offer is required with respect to the Net
Available Cash from any subsequent Asset Disposition).

  (c) Splitrock will comply, to the extent applicable, with the requirements of
Section 14(e) of the Exchange Act and any other securities laws or regulations
in connection with the repurchase of notes pursuant to this covenant. To the
extent that the provisions of any securities laws or regulations conflict with
provisions of this covenant, Splitrock will comply with the applicable
securities laws and regulations and will not be deemed to have breached its
obligations under this covenant by virtue thereof.

  Limitation on Transactions with Affiliates.  a) We will not, and will not
permit any Restricted Subsidiary to, directly or indirectly, enter into or
conduct any transaction (including the purchase, sale, lease or exchange of any
property or the rendering of any service) with any Affiliate of Splitrock (an
''Affiliate Transaction'') unless such transaction is on terms:

  (1) that are no less favorable to Splitrock or such Restricted Subsidiary, as
      the case may be, than those that could be obtained at the time of such
      transaction in arm's-length dealings with a Person who is not such an
      Affiliate;

  (2) that, in the event such Affiliate Transaction involves an aggregate
      amount in excess of $1.0 million,

      .  are set forth in writing and

      .  have been approved by a majority of the members of our board of
         directors having no personal stake in such Affiliate Transaction and

  (3) that, in the event such Affiliate Transaction involves an amount in excess
      of $20.0 million, have been determined by a nationally recognized
      appraisal or investment banking firm to be fair, from a financial
      standpoint, to Splitrock and its Restricted Subsidiaries.

  (b) The provisions of the foregoing paragraph (a) will not prohibit:

  (1) any Restricted Payment permitted to be paid pursuant to the covenant
      described under ''-- Limitation on Restricted Payments'',

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<PAGE>

  (2) any issuance of securities, or other payments, awards or grants in cash,
      securities or otherwise pursuant to, or the funding of, employment
      arrangements, stock options and stock ownership plans approved by our
      board of directors;

  (3) the grant of stock options or similar rights to employees and directors of
      Splitrock pursuant to plans approved by our board of directors,

  (4) loans or advances to employees in the ordinary course of business in
      accordance with past practices of Splitrock, but in any event not to
      exceed $2.0 million in the aggregate outstanding at anyone time,

  (5) the payment of reasonable fees to directors of Splitrock and its
      Subsidiaries who are not employees of Splitrock or its Subsidiaries;

  (6) any transaction between Splitrock and a Wholly Owned Subsidiary or between
      Wholly Owned Subsidiaries; or

  (7) any transaction pursuant to, and on the terms set forth in, the Prodigy
      Agreement.

      Limitation on the Sale or Issuance of Capital Stock of Restricted
      Subsidiaries. We will not permit:

  (a) any Restricted Subsidiary of Splitrock to issue any Capital Stock except
      for

  (1) Capital Stock issued or sold to, held by or transferred to Splitrock or a
      Wholly Owned Subsidiary,

  (2) Capital Stock issued by a Person prior to the time

      (A)  such Person becomes a Restricted Subsidiary of Splitrock,

      (B)  such Person merges with or into a Restricted Subsidiary of Splitrock
           or

      (C)  a Restricted Subsidiary of Splitrock merges with or into such Person;
           provided that such Capital Stock was not issued or Incurred by such
           Person in anticipation of the type of transaction contemplated by
           subclause (A), (B) or (C) (excluding for purposes of this proviso,
           shares of Capital Stock issued in connection with customary
           accelerated vesting provisions contained in option or similar plans
           or agreements which are accelerated as a result of a change of
           control of such Person and which option or similar plans or
           agreements were not adopted or implemented solely in anticipation of
           or in connection with such transaction) or

  (b) any Person (other than Splitrock or a Wholly Owned Subsidiary) to acquire
Capital Stock of any Restricted Subsidiary of Splitrock from us or any of our
Restricted Subsidiaries, except, in the case of each of clause (a) or (b):

  (1) upon the acquisition of all the outstanding Capital Stock of such
      Restricted Subsidiary in accordance with the covenant described under ''--
      Limitation on Sales of Assets and Subsidiary Stock'',

  (2) if, immediately after giving effect to such issuance or sale, such
      Restricted Subsidiary would no longer constitute a Restricted Subsidiary,
      and any Investment in such Person remaining after giving effect to such
      issuance or sale would have been permitted to be made pursuant to the
      covenant described under ''-- Limitation on Restricted Payments'' if made
      on the date of such issuance or sale, and

  (3) if required, the issuance, transfer, conveyance, sale or other disposition
      of directors' qualifying shares.

  Limitation on Liens.  We will not, and will not permit any Restricted
Subsidiary to, directly or indirectly, Incur or permit to exist any Lien of any
nature whatsoever on any of its property or assets (including Capital Stock of a
Restricted Subsidiary), whether owned at the Closing Date or thereafter
acquired, other than Permitted Liens, without effectively providing that the
notes shall be secured equally and ratably with (or prior to) the obligations so
secured for so long as such obligations are so secured; provided, that if such
obligations are expressly subordinated

                                       40
<PAGE>

to the notes or the Subsidiary Guarantees the Lien securing such obligations
will be subordinated and junior to the Lien securing the notes with the same
relative priority as such obligations have with respect to the notes or the
Subsidiary Guarantees.

  Commission Reports.  Notwithstanding that Splitrock may not be subject to the
reporting requirements of Section 13 or 15(d) of the Exchange Act Splitrock will
file with the Commission and provide the Trustee and Noteholders and prospective
Noteholders (upon request) within 15 days after it files them with the
Commission, copies of its annual report and the information, documents and other
reports that are specified in Sections 13 and 15(d) of the Exchange Act. In
addition, following a public offering of the common stock of Splitrock, we shall
furnish to the Trustee and the Noteholders, promptly upon their becoming
available, copies of the annual report to stockholders and any other information
provided by Splitrock to its public stockholders generally. We also will comply
with the other provisions of Section 314(a) of the TIA.

  Future Subsidiary Guarantors.  We will cause each Restricted Subsidiary that
Incurs Indebtedness to become a Subsidiary Guarantor, and execute and deliver to
the Trustee a supplemental indenture pursuant to which such Restricted
Subsidiary will Guarantee payment of the notes. Each Subsidiary Guarantee will
be limited to an amount not to exceed the maximum amount that can be Guaranteed
by that Restricted Subsidiary without rendering the Subsidiary Guarantee, as it
relates to such Restricted Subsidiary, voidable under applicable law relating to
fraudulent conveyance or fraudulent transfer or similar laws affecting the
rights of creditors generally.

  Limitation on Lines of Business.  We will not, and will not permit any
Restricted Subsidiary to, engage in any business other than a Telecommunications
Business.

  Limitation on Sale/Leaseback Transactions.  We will not, and will not permit
any Restricted Subsidiary to, enter into any Sale/Leaseback Transaction with
respect to any property unless:

  (a) Splitrock or such Restricted Subsidiary would be entitled to:

      .  Incur Indebtedness in an amount equal to the Attributable Debt with
         respect to such Sale/Leaseback Transaction pursuant to the covenant
         described under ''-- Limitation on Indebtedness'' and

      .  create a Lien on such property securing such Attributable Debt without
         equally and ratably securing the notes pursuant to the covenant
         described under ''-- Limitation on Liens'';

  (b) the net proceeds received by Splitrock or such Restricted Subsidiary in
      connection with such Sale/Leaseback Transaction are at least equal to the
      fair market value (as determined in good faith by our board of directors)
      of such property; and

  (c) the transfer of such property is permitted by, and Splitrock applies the
      proceeds of such transaction in compliance with, the covenant described
      under''-- Limitation on Sale of Assets and Subsidiary Stock''.

Merger and Consolidation

  (a) We will not consolidate with or merge with or into, or convey, transfer or
lease all or substantially all its assets to, any Person, unless:

  (1) the resulting, surviving or transferee Person (We refer to that Person as
      the ''Successor Company.'') will be a corporation organized and existing
      under the laws of the United States of America, any State thereof or the
      District of Columbia and the Successor Company (if not Splitrock) will
      expressly assume, by a supplemental indenture and other appropriate
      documents, executed and delivered to the Trustee, in form satisfactory to
      the Trustee, all the obligations of Splitrock under the notes, the
      Indenture and the Escrow and Disbursement Agreement;

  (2) immediately after giving effect to such transaction (and treating any
      Indebtedness which becomes an obligation of the Successor Company or any
      Restricted Subsidiary as a result of such transaction as having

                                       41
<PAGE>

      been Incurred by the Successor Company or such Restricted Subsidiary at
      the time of such transaction), no Default shall have occurred and be
      continuing;

  (3) immediately after giving effect to such transaction, the Successor Company
      would be able to Incur an additional $1.00 of Indebtedness under paragraph
      (a) of the covenant described under "--Certain Covenants -- Limitation on
      Indebtedness";

  (4) Splitrock shall have delivered to the Trustee an Officers' Certificate and
      an Opinion of Counsel, each stating that such consolidation, merger or
      transfer and such supplemental indenture and other appropriate documents,
      if any, comply with the Indenture and the Escrow and Disbursement
      Agreement;

  (5) Splitrock shall have delivered to the Trustee an Opinion of Counsel to the
      effect that the Holders will not recognize income, gain or loss for
      Federal income tax purposes as a result of such transaction and will be
      subject to Federal income tax on the same amounts, in the same manner and
      at the same times as would have been the case if such transaction had not
      occurred; and

  (6) Splitrock shall have delivered to the Trustee an Opinion of Counsel,
      subject to customary exceptions, to the effect that any Subsidiary
      Guarantee shall remain in full force and effect after such transaction.

  The Successor Company will succeed to, and be substituted for, and may
exercise every right and power of, Splitrock under the Indenture and the Escrow
and Disbursement Agreement, but the predecessor Company in the case of a
conveyance, transfer or lease of all or substantially all its assets will not be
released from the obligation to pay the principal of and interest on the notes.

  (b) We will not permit any Subsidiary Guarantor to consolidate with or merge
with or into, or convey, transfer or lease, all or substantially all of its
assets to any Person unless:

  (1) the resulting, surviving or transferee Person will be a corporation
      organized and existing under the laws of the United States of America, any
      State thereof or the District of Columbia, and such Person (if not a
      Subsidiary Guarantor) will expressly assume, by a supplemental indenture,
      executed and delivered to the Trustee, in form satisfactory to the
      Trustee, all the obligations of such Subsidiary Guarantor under its
      Subsidiary Guarantee;

  (2) immediately after giving effect to such transaction (and treating any
      Indebtedness which becomes an obligation of the resulting, surviving or
      transferee Person as a result of such transaction as having been incurred
      by such Person at the time of such transaction), no Default shall have
      occurred and be continuing; and

  (3) Splitrock shall have delivered to the Trustee an Officers' Certificate and
      an Opinion of Counsel, each stating that such consolidation, merger or
      transfer and such supplemental indenture (if any)comply with the
      Indenture.

  (c) Notwithstanding the entire foregoing section, (i) any Restricted
Subsidiary may consolidate with, merge into or transfer all or part of its
properties and assets to the Company and (ii) the Company may merge with an
Affiliate incorporated solely for the purpose of reincorporating the Company in
another jurisdiction to realize tax or other benefits.


Defaults

  An Event of Default is defined in the Indenture as:

  (1) a default in any payment of interest on any Note when due and payable,
      continued for 30 days;

  (2) a default in the payment of principal of any Note when due and payable at
      its Stated Maturity, upon required redemption or repurchase, upon
      declaration or otherwise;

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<PAGE>

  (3) our failure to comply with its obligations under the covenant described
      under "-- Merger and Consolidation;"

  (4) our failure to comply for 30 days after notice with any of its obligations
      under the covenants described under "-- Change of Control" or "--
      Certain Covenants" (in each case, other than a failure to purchase notes)
      or any of its agreements contained in the Escrow and Disbursement
      Agreement;

  (5) our failure to comply for 60 days after notice with its other agreements
      contained in the notes or the Indenture;

  (6) the failure by Splitrock or any Subsidiary to pay any Indebtedness within
      any applicable grace period after final maturity or the acceleration of
      any such Indebtedness by the holders thereof because of a default if the
      total amount of such Indebtedness unpaid or accelerated exceeds $5.0
      million or its foreign currency equivalent (the "cross acceleration
      provision") and such failure continues for 10 days after receipt of the
      notice specified in the Indenture;

  (7) certain events of bankruptcy, insolvency or reorganization of the Company
      or a Significant Subsidiary (the "bankruptcy provisions");

  (8) the rendering of any judgment or decree for the payment of money in excess
      of $5.0 million or its foreign currency equivalent against the Company or
      a Significant Subsidiary if

      . an enforcement proceeding thereon is commenced by any creditor, or

      . such judgment or decree remains outstanding for a period of 60 days
        following such judgment and is not discharged, waived or stayed (the
        "judgment default provision");

  (9) any Subsidiary Guarantee ceases to be in full force and effect (except as
      contemplated by the terms thereof) or any Subsidiary Guarantor or Person
      acting by or on behalf of such Subsidiary Guarantor denies or disaffirms
      such Subsidiary Guarantor's obligations under the Indenture or any
      Subsidiary Guarantee and such Default continues for 10 days after receipt
      of the notice specified in the Indenture; or

 (10) Splitrock challenging the Lien on the Escrow Collateral under the Escrow
      and Disbursement Agreement prior to the time that the Escrow Collateral is
      to be released to us, the Escrow Collateral becoming subject to any lien
      other than liens under the Escrow Agreement or the Escrow and Disbursement
      Agreement becomes, or Splitrock asserts that the Escrow and Disbursement
      Agreement is, invalid and unenforceable, other than in accordance with its
      terms.

  The foregoing will constitute Events of Default whatever the reason for any
such Event of Default and whether it is voluntary or involuntary or is effected
by operation of law or pursuant to any judgment, decree or order of any court or
any order, rule or regulation of any administrative or governmental body.

  However, a default under clauses (4), (5), (6) or (9) will not constitute an
Event of Default until the Trustee or the Holders of at least 25% in principal
amount of the outstanding notes notify Splitrock of the default and we do not
cure such default within the time specified in clauses (4), (5), (6) or (9)
hereof after receipt of such notice.

  If an Event of Default (other than an Event of Default relating to certain
events of bankruptcy, insolvency or reorganization of Splitrock) occurs and is
continuing, the Trustee or the Holders of at least 25% in principal amount of
the outstanding notes by notice to Splitrock may declare the principal of and
accrued but unpaid interest on all the notes to be due and payable. Upon such a
declaration, such principal and interest will be due and payable immediately. If
an Event of Default relating to certain events of bankruptcy, insolvency or
reorganization of Splitrock occurs, the principal of and interest on all the
notes will become immediately due and payable without any declaration or other
act on the part of the Trustee or any holders. Under certain circumstances, the
holders of a majority in principal amount of the outstanding notes may rescind
any such acceleration with respect to the notes and its consequences.

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<PAGE>

  Subject to the provisions of the Indenture relating to the duties of the
Trustee, in case an Event of Default occurs and is continuing, the Trustee will
be under no obligation to exercise any of the rights or powers under the
Indenture at the request or direction of any of the holders unless such holders
have offered to the Trustee reasonable indemnity or security against any loss,
liability or expense. Except to enforce the right to receive payment of
principal, premium, if any, or interest when due, no holder may pursue any
remedy with respect to the Indenture or the notes unless:

  (1) such holder has previously given the Trustee notice that an Event of
      Default is continuing;

  (2) holders of at least 25% in principal amount of the outstanding notes have
      requested the Trustee in writing to pursue the remedy;

  (3) such holders have offered the Trustee reasonable security or indemnity
      against any loss, liability or expense;

  (4) the Trustee has not complied with such request within 60 days after the
      receipt of the request and the offer of security or indemnity; and

  (5) the holders of a majority in principal amount of the outstanding notes
      have not given the Trustee a direction inconsistent with such request
      within such 60-day period.

  Subject to certain restrictions, the holders of a majority in principal amount
of the outstanding notes are given the right to direct the time, method and
place of conducting any proceeding for any remedy available to the Trustee or of
exercising any trust or power conferred on the Trustee. The Trustee, however,
may refuse to follow any direction that conflicts with law or the Indenture or
that the Trustee determines is unduly prejudicial to the rights of any other
holder or that would involve the Trustee in personal liability. Prior to taking
any action under the Indenture, the Trustee will be entitled to indemnification
satisfactory to it in its sole discretion against all losses and expenses caused
by taking or not taking such action.

  The Indenture provides that if a Default occurs and is continuing and is known
to the Trustee, the Trustee must mail to each holder notice of the Default
within the earlier of 90 days after it occurs or 30 days after it is known to a
Trust Officer or written notice of it is received by the Trustee. Except in the
case of a Default in the payment of principal of, premium (if any) or interest
on any note (including payments pursuant to the redemption provisions of such
note), the Trustee may withhold notice if and so long as a committee of its
Trust Officers in good faith determines that withholding notice is in the
interests of the noteholders. In addition, the Company is required to deliver to
the Trustee, within 120 days after the end of each fiscal year, a certificate
indicating whether the signers thereof know of any Default that occurred during
the previous year. We are also required to deliver to the Trustee, within 30
days after the occurrence thereof, written notice of any event which would
constitute certain Events of Default, their status and what action Splitrock is
taking or proposes to take in respect thereof.


Amendments and Waivers

  Subject to certain exceptions, the Indenture or the notes may be amended with
the written consent of the Holders of a majority in principal amount of the
notes then outstanding and any past default or compliance with any provisions
may be waived with the consent of the holders of a majority in principal amount
of the notes then outstanding. However, without the consent of each holder of an
outstanding note affected, no amendment may, among other things:

  (1) reduce the amount of notes whose holders must consent to an amendment;

  (2) reduce the rate of or extend the time for payment of interest or any
      liquidated damages on any note;

  (3) reduce the principal of or extend the Stated Maturity of any note;

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<PAGE>

  (4) reduce the premium payable upon the redemption of any note or change the
      time at which any note may be redeemed as described under "-- Optional
      Redemption";

  (5) make any note payable in money other than that stated in the note;

  (6) impair the right of any holder to receive payment of principal of and
      interest or any liquidated damages on such holder's notes on or after the
      due dates therefor or to institute suit for the enforcement of any payment
      on or with respect to such holder's notes;

  (7) make any change in the amendment provisions which require each holder's
      consent or in the waiver provisions;

  (8) modify the Subsidiary Guarantees in any manner adverse to the holders; or

  (9) modify the provisions of the Escrow and Disbursement Agreement or the
      Indenture relating to the Escrow Collateral in any manner adverse to the
      holders or release any of the Escrow Collateral from the Lien under the
      Escrow and Disbursement Agreement or permit any other obligation to be
      secured by the Escrow Collateral.

  Without the consent of any holder, Splitrock and the Trustee may amend the
Indenture:

  .  to cure any ambiguity, omission, defect or inconsistency,

  .  to provide for the assumption by a successor corporation of the obligations
     of Splitrock under the Indenture,

  .  to provide for uncertificated notes in addition to or in place of
     certificated notes (provided that the uncertificated notes are issued in
     registered form for purposes of Section 163(f) of the Code, or in a manner
     such that the uncertificated notes are described in Section 163(f)(2)(B) of
     the Code),

  .  to add additional Guarantees with respect to the notes,

  .  to secure the notes,

  .  to add to Splitrock's covenants for the benefit of the holders or to
     surrender any right or power conferred upon the Company,

  .  to make any change that does not adversely affect the rights of any holder,
     subject to the provisions of the Indenture,

  .  to provide for the issuance of the exchange notes, or additional notes or

  .  to comply with any requirement of the Commission in connection with the
     qualification of the Indenture under the TIA.

  The consent of the holders is not necessary under the Indenture to approve the
particular form of any proposed amendment. It is sufficient if such consent
approves the substance of the proposed amendment.

  After an amendment under the Indenture becomes effective, Splitrock is
required to mail to the holders a notice briefly describing such amendment.
However, the failure to give such notice to all holders, or any defect therein,
will not impair or affect the validity of the amendment.

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<PAGE>

Transfer

  A holder may transfer notes in accordance with the Indenture. Upon any
transfer, the registrar and the Trustee may require a holder, among other
things, to furnish appropriate endorsements and transfer documents and Splitrock
may require a holder to pay any taxes required by law or permitted by the
Indenture. We are not required to transfer any note selected for redemption or
to transfer any note for a period of 15 days prior to a selection of notes to be
redeemed. The notes will be issued in registered form and the registered holder
of a note will be treated as the owner of such note for all purposes.


Defeasance

  Splitrock at any time may terminate all its obligations under the notes and
the Indenture ("legal defeasance"), except for certain obligations, including
those respecting the defeasance trust and obligations to register the transfer
or exchange of the notes, to replace mutilated, destroyed, lost or stolen notes
and to maintain a registrar and paying agent in respect of the notes. Splitrock
at any time may terminate its obligations under the covenants described under
"-- Certain Covenants", the operation of the cross acceleration provision, the
bankruptcy provisions with respect to Significant Subsidiaries and the judgment
default provision described under "-- Defaults", the provisions described
under "-- Change of Control" and the limitations contained in clause (3) under
the first paragraph of "-- Merger and Consolidation" ("covenant
defeasance"). Splitrock may exercise its legal defeasance option
notwithstanding its prior exercise of its covenant defeasance option. If
Splitrock exercises its legal defeasance option, payment of the notes may not be
accelerated because of an Event of Default with respect thereto. If Splitrock
exercises its covenant defeasance option, payment of the notes may not be
accelerated because of an Event of Default specified in clause (4), (6), (7)
(with respect only to Significant Subsidiaries) or (8) under "-- Defaults" or
because of the failure of the Company to comply with clause (3) under the first
paragraph of "-- Merger and Consolidation."

  In order to exercise either defeasance option, we must irrevocably deposit in
trust (the "defeasance trust") with the Trustee money or U.S. Government
Obligations for the payment of principal, premium (if any) and interest on the
notes to redemption or maturity, as the case may be, and must comply with
certain other conditions, including delivery to the Trustee of an Opinion of
Counsel to the effect that holders of the notes will not recognize income, gain
or loss for Federal income tax purposes as a result of such deposit and
defeasance and will be subject to Federal income tax on the same amounts and in
the same manner and at the same times as would have been the case if such
deposit and defeasance had not occurred (and, in the case of legal defeasance
only, such Opinion of Counsel must be based on a ruling of the Internal Revenue
Service or other change in applicable Federal income tax law).


The Trustee

  The Bank of Montreal Trust Company is to be the Trustee under the Indenture
and has been appointed by the Company as Registrar and Paying Agent with regard
to the notes.


Governing Law

  The Indenture provides that it and the notes will be governed by, and
construed in accordance with, the laws of the State of New York without giving
effect to applicable principles of conflicts of law to the extent that the
application of the law of another jurisdiction would be required thereby.


Book Entry, Delivery and Form

  The warrants and the notes (and the related guarantees) initially will each be
represented by a single permanent global certificate in definitive, fully
registered form, (We refer to them as the "Global Warrant" and the "Global
Note," respectively), deposited with the Depository Trust Company and
registered in the name of DTC's nominee. Except under the circumstances
described below, we will not issue the warrants and the notes in definitive
form.

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<PAGE>

  Warrants and notes (i) originally purchased by or transferred to "foreign
purchasers" or (ii) held by qualified institutional buyers or Accredited
Investors (as defined in Regulation D under the Securities Act) who are not
"qualified institutional buyers" (as defined in Rule 144A under the Securities
Act) (We refer to them as the "QIBs".) who elect to take physical delivery of
their certificates instead of holding their interests through the Global Warrant
or Global Note (and which are thus ineligible to trade through the Depositary)
(We collectively referred to them as the "Non-Global Purchasers") will be
issued in registered form (We refer to it as the "Certificated Security").
Upon the transfer to a QIB of any Certificated Security initially issued to a
Non-Global Purchaser, such Certificated Security will, unless the transferee
requests otherwise or the Global Warrant or Global Note has previously been
exchanged in whole for Certificated Securities, be exchanged for an interest in
the Global Warrant or Global Note.

  Pursuant to procedures established by the Depositary (i) upon the issuance of
the Global Warrant and Global Note, the Depositary or its custodian credited, on
its internal system, the number of warrants of the individual beneficial
interests represented by the Global Warrant and the principal amount of notes of
the individual beneficial interests represented by such Global Note to the
respective accounts of persons who have accounts with such depositary and (ii)
ownership of beneficial interests in the Global Warrant and Global Note will be
shown on, and the transfer of such ownership will be effected only through,
records maintained by the Depositary or its nominee (with respect to interests
of participants) and the records of participants (with respect to interests of
persons other than participants). Such accounts were initially designated by or
on behalf of the Initial Purchaser and ownership of beneficial interests in the
Global Warrant and Global Note will be limited to persons who have accounts with
the Depositary ("participants") or persons who hold interests through
participants. QIBs may hold their interests in the Global Warrant and Global
Note directly through the Depositary if they are participants in such system, or
indirectly through organizations which are participants in such system. So long
s the Depositary, or its nominee, is the registered owner or holder of the
warrants or notes, the Depositary or such nominee, as the case may be, will be
considered the sole owner or holder of the warrants or notes represented by such
Global Warrant or Global Note for all purposes under the Indenture. No
beneficial owner of an interest in the warrants or Global Note will be able to
transfer that interest except in accordance with the procedures of the
Depositary, in addition to those provided under the Indenture with respect to
the notes.


  The Depositary has advised us that it is

  .  a limited purpose trust company organized under the laws of the State of
     New York,

  .  a "banking organization" within the meaning of the New York Banking Law,

  .  a member of the Federal Reserve System,

  .  a "clearing corporation" within the meaning of the Uniform Commercial
     Code, as amended, and

  .  a "clearing agency" registered pursuant to Section 17A of the Exchange
     Act.

  The Depositary was created to hold securities for its participants and
facilitates the clearance and settlement of securities transactions between
participants through electronic book-entry changes to the accounts of its
participants, thereby eliminating the need for physical transfer and delivery of
certificates. Participants in the Depositary include securities brokers and
dealers (including the Initial Purchaser), banks and trust companies, clearing
corporations and certain other organizations. Indirect access to the system of
the Depositary is also available to other entities such as banks, brokers,
dealers and trust companies (collectively referred to as the "indirect
participants") that clear through or maintain a custodial relationship with a
participant, either directly or indirectly. Investors who are not participants
may beneficially own securities held by or on behalf of the Depositary only
through participants or indirect participants.

  The laws of some jurisdictions may require that certain purchasers of
securities take physical delivery of such securities in definitive form.
Accordingly, the ability to transfer interests in the securities represented by
a global security to such persons may be limited. In addition, because the
Depositary can act only on behalf of its participants, who in turn act on behalf
of persons who hold interests through participants, the ability of a person

                                       47
<PAGE>

having an interest in securities represented by a global security to pledge or
transfer such interest to persons or entities that do not participate in the
system of the Depositary, or to otherwise take actions in respect of such
interest, may be affected by the lack of a physical definitive security in
respect of such interest.

  Payments with respect to the principal of, premium, if any, Liquidated
Damages, if any, and interest on, any notes represented by the Global Note on
the applicable record date will be payable by the Trustee to or at the direction
of the Depositary or its nominee in its capacity as the registered holder of the
Global Note. Under the terms of the Indenture, Splitrock and the Trustee may
treat the persons in whose names the notes, including the Global Note, are
registered as the owners thereof for the purpose of receiving payment thereon
and for any and all other purposes whatsoever. Accordingly, neither the Company
nor the Trustee has or will have any responsibility or liability for the payment
of such amounts to owners of beneficial interests in the Global Note (including
principal, premium, if any, Liquidated Damages, if any, and interest). Payments
by the participants and the indirect participants to the owners of beneficial
interests in the Global Note will be governed by standing instructions and
customary industry practice and will be the responsibility of the participants
or the indirect participants and the Depositary. Transfers between participants
in the Depositary will be effected in accordance with the procedures of the
Depositary, and will be settled in same-day funds.


Certificated Securities

  If (1) Splitrock notifies the Trustee in writing that the Depositary is no
longer willing or able to act as a depositary or the Depositary ceases to be
registered as a clearing agency under the Exchange Act and a success or
depositary is not appointed within 90 days of such notice or cessation, (2)
Splitrock, at its option, notifies the Trustee in writing that it elects to
cause the issuance of warrants and notes in definitive form or (3) upon the
occurrence of certain other events, then, upon surrender by the Depositary of
the Global Warrant and Global Note, certificated notes and warrants will be
issued to each person that the Depositary identifies as the beneficial owner of
the warrants and notes represented by the Global Warrant and Global Note. Upon
any such issuance, the Trustee is required to register such certificated notes
and warrants in the name of such person or persons (or the nominee of any
thereof) and cause the same to be delivered thereto.

  Neither Splitrock nor the Trustee shall be liable for any delay by the
Depositary or any participant or indirect participant in identifying the
beneficial owners of the related warrants and notes and each such person may
conclusively rely on, and shall be protected in relying on, instructions from
the Depositary for all purposes.


Certain Definitions

  "Affiliate" of any specified Person means any other Person, directly or
indirectly, controlling or controlled by or under direct or indirect common
control with such specified Person. For the purposes of this definition,
"control" when used with respect to any Person means the power to direct the
management and policies of such Person, directly or indirectly, whether through
the ownership of voting securities, by contract or otherwise; and the terms
"controlling" and "controlled" have meanings correlative to the foregoing.
For purposes of the provisions described under "-- Certain Covenants --
Limitation on Transactions with Affiliates" only, "Affiliate" shall also mean
any beneficial owner of shares representing 5% or more of the total voting power
of the Voting Stock (on a fully diluted basis) of Splitrock or of rights or
warrants to purchase such Voting Stock (whether or not currently exercisable)and
any Person who would be an Affiliate of any such beneficial owner pursuant to
the first sentence hereof.

  "Asset Disposition" means any sale, lease, transfer or other disposition (or
series of related sales, leases, transfers or dispositions) by Splitrock or any
Restricted Subsidiary, including any disposition by means of a merger,
consolidation, or similar transaction (each referred to for the purposes of this
definition as a "disposition"), of:

  (1) any shares of Capital Stock of a Restricted Subsidiary (other than
      directors' qualifying shares or shares required by applicable law to be
      held by a Person other than Splitrock or a Restricted Subsidiary);

  (2) all or substantially all the assets of any division or line of business of
      Splitrock or any Restricted Subsidiary; or

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<PAGE>

  (3) any other assets of Splitrock or any Restricted Subsidiary other than
      inventory or obsolete assets sold in the ordinary course of business of
      Splitrock or such Restricted Subsidiary.

  For the purposes of this definition, the term "Asset Sale" shall not include:

  (a) a disposition by a Restricted Subsidiary to Splitrock or by Splitrock or a
      Restricted Subsidiary to a Wholly Owned Subsidiary;

  (b) for purposes of the provisions described under "-- Certain Covenants --
      Limitation on Sales of Assets and Subsidiary Stock" only, a disposition
      subject to the covenant described under "--Certain Covenants --
      Limitation on Restricted Payments"; and

  (c) a disposition of assets with a fair market value of less than $250,000.

  "Attributable Debt" in respect of a Sale/Leaseback Transaction means, as at
the time of determination, the present value (discounted at the interest rate
borne by the notes, compounded annually) of the total obligations of the lessee
for rental payments during the remaining term of the lease included in a
Sale/Leaseback Transaction (including any period for which such lease has been
extended).

  "Average Life" means, as of the date of determination, with respect to any
Indebtedness or Preferred Stock, the quotient obtained by dividing (1) the sum
of the products of the numbers of years from the date of determination to the
dates of each successive scheduled principal payment of such Indebtedness or
redemption or similar payment with respect to such Preferred Stock multiplied by
the amount of such payment by (2) the sum of all such payments.

  "Bank Indebtedness" means any Indebtedness outstanding under any credit or
similar agreement with a financial institution which provides for revolving
credit loans, term loans or letters of credit or other credit facilities, as
amended, waived, restated, supplemented, extended, replaced, refinanced or
otherwise modified from time to time.

  "Board of Directors" means our board of directors or any committee thereof
duly authorized to act on behalf of such Board.

  "Business Day" means each day which is not a Legal Holiday.

  "Capital Stock" of any Person means any and all shares, interests, rights to
purchase, warrants, options, participations or other equivalents of or interests
in (however designated) equity of such Person, including any Preferred Stock,
but excluding any debt securities convertible into such equity.

  "Capitalized Lease Obligations" means an obligation that is required to be
classified and accounted for as a capitalized lease for financial reporting
purposes in accordance with GAAP, and the amount of Indebtedness represented by
such obligation shall be the capitalized amount of such obligation determined in
accordance with GAAP; and the Stated Maturity thereof shall be the date of the
last payment of rent or any other amount due under such lease prior to the first
date upon which such lease may be prepaid by the lessee without payment of a
penalty.

  "Cash Contribution Amount" means the aggregate amount of cash contribution
made to the capital of Splitrock described in the definition of "Contribution
Indebtedness".

  "Closing Date" means the date of the Indenture.

  "Code" means the Internal Revenue Code of 1986, as amended.

  "Commission" means the Securities and Exchange Commission.

                                       49
<PAGE>

  "Consolidated Interest Expense" means, for any period, the total interest
expense of Splitrock and its Consolidated Restricted Subsidiaries, plus, to the
extent Incurred by Splitrock and its Subsidiaries in such period but not
included in such interest expense,

  (1)  interest expense attributable to Capitalized Lease Obligations and the
       interest expense relating to Attributable Debt,

  (2)  amortization of debt discount and debt issuance costs,

  (3)  capitalized interest,

  (4)  non-cash interest expense,

  (5)  commissions, discounts and other fees and charges attributable to letters
       of credit and bankers' acceptance financing,

  (6)  interest accruing on any Indebtedness of any other Person to the extent
       such Indebtedness is Guaranteed by Splitrock or any Restricted
       Subsidiary,

  (7)  net costs associated with Hedging Obligations (including amortization of
       fees),

  (8)  dividends in respect of all Disqualified Stock of Splitrock and all
       Preferred Stock of the Subsidiaries of Splitrock to the extent held by
       Persons other than Splitrock or a Wholly Owned Subsidiary,

  (9)  interest Incurred in connection with investments in discontinued
       operations and

  (10) the cash contributions to any employee stock ownership plan or similar
       trust to the extent such contributions are used by such plan or trust to
       pay interest or fees to any Person (other than Splitrock) in connection
       with Indebtedness Incurred by such plan or trust.

  "Consolidated Net Income" means, for any period, the net income of Splitrock
and its Consolidated Subsidiaries for such period; provided, however, that there
shall not be included in such Consolidated Net Income:

  (1)  any net income or loss of any Person (other than Splitrock) if such
       Person is not a Restricted Subsidiary, except that:

       (A) subject to the limitations contained in clause (4) below, Splitrock's
           equity in the net income of any such Person for such period shall be
           included in such Consolidated Net Income up to the aggregate amount
           of cash actually distributed by such Person during such period to
           Splitrock or a Restricted Subsidiary as a dividend or other
           distribution (subject, in the case of a dividend or other
           distribution made to a Restricted Subsidiary, to the limitations
           contained in clause (3) below) and

       (B) Splitrock's equity in a net loss of any such Person (including any
           Unrestricted Subsidiary) for such period shall be included in
           determining such Consolidated Net Income;

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

  (3)  any net income (or loss) of any Restricted Subsidiary if such Restricted
       Subsidiary is subject to restrictions, directly or indirectly, on the
       payment of dividends or the making of distributions by such Restricted
       Subsidiary, directly or indirectly, to Splitrock, except that:

       (A) subject to the limitations contained in clause (4) below, Splitrock's
           equity in the net income of any such Restricted Subsidiary for such
           period shall be included in such Consolidated Net Income up to the
           aggregate amount of cash actually distributed by such Restricted
           Subsidiary during such period to Splitrock or another Restricted
           Subsidiary as a dividend or other distribution(subject, in the case
           of a

                                       50
<PAGE>

           dividend or other distribution made to another Restricted Subsidiary,
           to the limitation contained in this clause) and

      (B)  Splitrock's equity in a net loss of any such Restricted Subsidiary
           for such period shall be included in determining such Consolidated
           Net Income;

  (4) any gain (but not loss) realized upon the sale or other disposition of any
      asset of Splitrock or its Consolidated Subsidiaries (including pursuant to
      any Sale/Leaseback Transaction) that is not sold or otherwise disposed of
      in the ordinary course of business and any gain (but not loss) realized
      upon the sale or other disposition of any Capital Stock of any Person;

  (5) any extraordinary gain or loss; and

  (6) the cumulative effect of a change in accounting principles.

  Notwithstanding the foregoing, for the purpose of the covenant described under
"-- Certain Covenants -- Limitation on Restricted Payments" only, there shall
be excluded from Consolidated Net Income any dividends, repayments of loans or
advances or other transfers of assets from Unrestricted Subsidiaries to
Splitrock or a Restricted Subsidiary to the extent such dividends, repayments or
transfers increase the amount of Restricted Payments permitted under such
covenant pursuant to clause (a)(3)(D) thereof.

  "Consolidated Operating Cash Flow" for any period means the Consolidated Net
Income for such period, plus the following to the extent deducted in calculating
such Consolidated Net Income:

  (1) income tax expense of Splitrock and its Consolidated Restricted
      Subsidiaries,

  (2) Consolidated Interest Expense,

  (3) depreciation expense of Splitrock and its Consolidated Restricted
      Subsidiaries,

  (4) amortization expense of Splitrock and its Consolidated Restricted
      Subsidiaries (excluding amortization expense attributable to a prepaid
      cash item that was paid in a prior period) and

  (5) all other non-cash charges of Splitrock and its Consolidated Restricted
      Subsidiaries (excluding any such non-cash charge to the extent it
      represents an accrual of or reserve for cash expenditures in any future
      period) in each case for such period.

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

  "Consolidation" means the consolidation of the amounts of each Restricted
Subsidiary with those of Splitrock in accordance with GAAP consistently applied;
provided, however, that "Consolidation" will not include consolidation of the
accounts of any Unrestricted Subsidiary, but the interest of Splitrock or any
Restricted Subsidiary in an Unrestricted Subsidiary will be accounted for as an
investment. The term "Consolidated" has a correlative meaning.

  "Contribution Indebtedness" means Indebtedness of Splitrock in an aggregate
principal amount not greater than twice the aggregate amount of the Net Cash
Proceeds received by Splitrock from contributions made to the capital of
Splitrock after the date hereof, provided that such Contribution Indebtedness

                                       51
<PAGE>

  .  has a Stated Maturity later than the Stated Maturity of the notes,

  .  is Incurred substantially concurrently with such cash contribution, and

  .  is so designated as Contribution Indebtedness, pursuant to an Officers'
     Certificate, on the Incurrence date thereof.

  "Currency Agreement" means with respect to any Person, any foreign exchange
contract, currency swap agreement or any similar agreement or arrangement to
which such Person is a party or of which it is a beneficiary.

  "Debt to Annualized Operating Cash Flow Ratio" means the ratio of (a) the
Total Consolidated Indebtedness as of the date of calculation (the
"Determination Date") to (b) four times the Consolidated Operating Cash Flow
for the latest fiscal quarter for which financial information is available
immediately preceding such Determination Date (the "Measurement Period"). For
purposes of calculating Consolidated Operating Cash Flow for the Measurement
Period immediately prior to the relevant Determination Date

  (1) any Person that is a Restricted Subsidiary on the Determination Date (or
      would become a Restricted Subsidiary on such Determination Date in
      connection with the transaction that requires the determination of such
      Consolidated Operating Cash Flow) will be deemed to have been a Restricted
      Subsidiary at all times during such Measurement Period;

  (2) any Person that is not a Restricted Subsidiary on such Determination Date
      (or would cease to be a Restricted Subsidiary on such Determination Date
      in connection with the transaction that requires the determination of such
      Consolidated Operating Cash Flow) will be deemed not to have been a
      Restricted Subsidiary at any time during such Measurement Period; and

  (3) if Splitrock or any Restricted Subsidiary shall have in any manner:

      .  acquired (through an acquisition or the commencement of activities
         constituting such operating business) or

      .  disposed of (by an Asset Disposition or the termination or
         discontinuance of activities constituting such operating business) any
         operating business during such Measurement Period or after the end of
         such period and on or prior to such Determination Date,

      such calculation will be made on a pro forma basis in accordance with GAAP
      as if all such transactions had been consummated prior to the first day of
      such Measurement Period (it being understood that in calculating
      Consolidated Operating Cash Flow, the exclusions set forth in clauses (1)
      through (6) of the definition of Consolidated Net Income shall apply to a
      Person which has been acquired as if it were a Restricted Subsidiary).

  "Default" means any event which is, or after notice or passage of time or
both would be, an Event of Default.

  "Disqualified Stock" means, with respect to any Person, any Capital Stock
which by its terms (or by the terms of any security into which it is convertible
or for which it is exchangeable or exercisable) or upon the happening of any
event

  .  matures or is mandatorily redeemable pursuant to a sinking fund obligation
     or otherwise,

  .  is convertible or exchangeable for Indebtedness or Disqualified Stock or

  .  is redeemable at the option of the holder thereof, in whole or in part, in
     each case on or prior to the first anniversary of the Stated Maturity of
     the notes;

                                       52
<PAGE>

provided, however, that any Capital Stock that would not constitute Disqualified
Stock but for provisions thereof giving holders thereof the right to require
such Person to repurchase or redeem such Capital Stock upon the occurrence of an
"asset sale" or "change of control" occurring prior to the first anniversary
of the Stated Maturity of the Securities shall not constitute Disqualified Stock
if the "asset sale" or "change of control" provisions applicable to such
Capital Stock are not more favorable to the holders of such Capital Stock than
the provisions of the covenants described under "-- Change of Control" and "-
- -Certain Covenants-- Limitation on Sale of Assets and Subsidiary Stock".

  "Equity Offering" means any public or private sale of common stock or
Preferred Stock of Splitrock (other than Disqualified Stock) other than any sale
to a Permitted Holder.

  "Escrow Account" means an escrow account for the deposit of approximately
$56.8 million of the net proceeds from the sale of the notes under the Escrow
and Disbursement Agreement.

  "Escrow Agent" means The Chase Manhattan Bank as Escrow Agent under the
Escrow and Disbursement Agreement, or any successor thereto appointed pursuant
to such agreement.

  "Escrow and Disbursement Agreement" means the Escrow and Disbursement
Agreement, dated as of the Closing Date, by and among the Escrow Agent, the
Trustee and Splitrock, governing the disbursement of funds from the Escrow
Account.

  "Exchange Act" means the Securities Exchange Act of 1934, as amended.

  "Fair Market Value" means, with respect to any asset or property, the price
that could be negotiated in an arm's-length free market transaction, for cash,
between a willing seller and a willing buyer, neither of whom is under pressure
or compulsion to complete the transaction. Unless otherwise specified in the
Indenture, Fair Market Value shall be determined by our board of directors
acting in good faith and shall be evidenced by a resolution of our board of
directors delivered to the Trustee.

  "GAAP" means generally accepted accounting principles in the United States
of America as in effect as of the Closing Date, including those set forth in:

  .  the opinions and pronouncements of the Accounting Principles Board of the
     American Institute of Certified Public Accountants,

  .  statements and pronouncements of the Financial Accounting Standards Board,

  .  such other statements by such other entities as approved by a significant
     segment of the accounting profession and

  .  the rules and regulations of the Commission governing the inclusion of
     financial statements (including pro forma financial statements) in periodic
     reports required to be filed pursuant to Section 13 of the Exchange Act,
     including opinions and pronouncements in staff accounting bulletins and
     similar written statements from the accounting staff of the Commission.

  All ratios and computations based on GAAP contained in the Indenture shall be
computed in conformity with GAAP.

  "Guarantee" means any obligation, contingent or otherwise, of any Person
directly or indirectly guaranteeing any Indebtedness or other obligation of any
other Person and any obligation, direct or indirect, contingent or otherwise, of
such Person:

  (1) to purchase or pay (or advance or supply funds for the purchase or payment
      of) such Indebtedness or other obligation of such other Person (whether
      arising by virtue of partnership arrangements, or by agreement to keep-
      well, to purchase assets, goods, securities or services, to take-or-pay,
      or to maintain financial statement conditions or otherwise) or

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<PAGE>

  (2) entered into for purposes of assuring in any other manner the obligee of
      such Indebtedness or other obligation of the payment thereof or to protect
      such obligee against loss in respect thereof (in whole or in part);

provided, however, that the term "Guarantee" shall not include endorsements
for collection or deposit in the ordinary course of business. The term
"Guarantee" used as a verb has a corresponding meaning. The term "Guarantor"
shall mean any Person Guaranteeing any obligation.

  "Hedging Obligations" of any Person means the obligations of such Person
pursuant to any Interest Rate Agreement or any Currency Agreement.

  "Holder" or "Noteholder" means the Person in whose name a Note is
registered on the registrar's books.

  "Incur" means issue, assume, Guarantee, incur or otherwise become liable
for; provided, however, that any Indebtedness or Capital Stock of a Person
existing at the time such Person becomes a Subsidiary (whether by merger,
consolidation, acquisition or otherwise) shall be deemed to be Incurred by such
Person at the time it becomes a Subsidiary. The term "Incurrence" when used as
a noun shall have a correlative meaning. The accretion of principal of a non-
interest bearing or other discount security shall be deemed the Incurrence of
Indebtedness.

  "Indebtedness" means, with respect to any Person on any date of
determination (without duplication):

  (1) the principal of and premium (if any)in respect of indebtedness of such
      Person for borrowed money;

  (2) the principal of and premium (if any) in respect of obligations of such
      Person evidenced by bonds, debentures, notes or other similar instruments;

  (3) all obligations of such Person in respect of letters of credit or other
      similar instruments (including reimbursement obligations with respect
      thereto);

  (4) all obligations of such Person to pay the deferred and unpaid purchase
      price of property or services (except Trade Payables), which purchase
      price is due more than six months after the date of placing such property
      in service or taking delivery and title thereto or the completion of such
      services;

  (5) Capitalized Lease Obligations and all Attributable Debt of such Person;

  (6) the amount of all obligations of such Person with respect to the
      redemption, repayment or other repurchase of any Disqualified Stock or,
      with respect to any Subsidiary of such Person, any Preferred Stock (but
      excluding, in each case, any accrued dividends);

  (7) all Indebtedness of other Persons secured by a Lien on any asset of such
      Person, whether or not such Indebtedness is assumed by such Person;
      provided, however, that the amount of Indebtedness of such Person shall be
      the lesser of:

      .  the fair market value of such asset at such date of determination and

      .  the amount of such Indebtedness of such other Persons;

  (8) to the extent not otherwise included in this definition, Hedging
      Obligations of such Person; and

  (9) all obligations of the type referred to in clauses (1) through (8) of
      other Persons and all dividends of other Persons for the payment of which,
      in either case, such Person is responsible or liable, directly or
      indirectly, as obligor, guarantor or otherwise, including by means of any
      Guarantee.

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<PAGE>

The amount of Indebtedness of any Person at any date shall be the outstanding
balance at such date of all unconditional obligations as described above and the
maximum liability, upon the occurrence of the contingency giving rise to the
obligation, of any contingent obligations at such date.

  "Interest Rate Agreement" means with respect to any Person any interest rate
protection agreement, interest rate future agreement, interest rate option
agreement, interest rate swap agreement, interest rate cap agreement, interest
rate collar agreement, interest rate hedge agreement or other similar agreement
or arrangement as to which such Person is party or a beneficiary.

  "Investment" in any Person means any direct or indirect advance, loan (other
than advances to customers in the ordinary course of business that are recorded
as accounts receivable on the balance sheet of the lender) or other extension of
credit (including by way of Guarantee or similar arrangement) or capital
contribution to (by means of any transfer of cash or other property to others or
any payment for property or services for the account or use of others), or any
purchase or acquisition of Capital Stock, Indebtedness or other similar
instruments issued by such Person. For purposes of the definition of
"Unrestricted Subsidiary" and the covenant described under "-- Certain
Covenants -- Limitation on Restricted Payments":

  (1) "Investment" shall include the portion (proportionate to Splitrock's
      equity interest in such Subsidiary) of the fair market value of the net
      assets of any Subsidiary of Splitrock at the time that such Subsidiary is
      designated an Unrestricted Subsidiary; provided, however, that upon a
      redesignation of such Subsidiary as a Restricted Subsidiary, Splitrock
      shall be deemed to continue to have a permanent "Investment" in an
      Unrestricted Subsidiary in an amount (if positive) equal to:

      .  Splitrock's "Investment" in such Subsidiary at the time of such
         redesignation, less

      .  the portion (proportionate to Splitrock's equity interest in such
         Subsidiary) of the fair market value of the net assets of such
         Subsidiary at the time of such redesignation; and

  (2) any property transferred to or from an Unrestricted Subsidiary shall be
      valued at its fair market value at the time of such transfer, in each case
      as determined in good faith by our board of directors.

  "Legal Holiday" means a Saturday, Sunday or other day on which banking
institutions in New York State are authorized or required by law to close.

  "Lien" means any mortgage, pledge, security interest, encumbrance, lien or
charge of any kind (including any conditional sale or other title retention
agreement or lease in the nature thereof).

  "Net Available Cash" from an Asset Disposition means cash payments
received(including any cash payments received by way of deferred payment of
principal pursuant to a note or installment receivable or otherwise and proceeds
from the sale or other disposition of any securities received as consideration,
but only as and when received, but excluding any other consideration received in
the form of assumption by the acquiring Person of Indebtedness or other
obligations relating to the properties or assets that are the subject of such
Asset Disposition or received in any other non-cash form) therefrom, in each
case net of

  (1) all legal, title and recording tax expenses, commissions and other fees
      and expenses incurred, and all Federal, state, provincial, foreign and
      local taxes required to be paid or accrued as a liability under GAAP, as a
      consequence of such Asset Disposition;

  (2) all payments made on any Indebtedness which is secured by any assets
      subject to such Asset Disposition, in accordance with the terms of any
      Lien upon or other security agreement of any kind with respect to such
      assets, or which must by its terms, or in order to obtain a necessary
      consent to such Asset Disposition, or by applicable law be repaid out of
      the proceeds from such Asset Disposition;

  (3) all distributions and other payments required to be made to minority
      interest holders in Subsidiaries or joint ventures as a result of such
      Asset Disposition; and

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<PAGE>

  (4) appropriate amounts to be provided by the seller as a reserve, in
      accordance with GAAP, against any liabilities associated with the property
      or other assets disposed of in such Asset Disposition and retained by
      Splitrock or any Restricted Subsidiary after such Asset Disposition.

  "Net Cash Proceeds", with respect to any issuance or sale of Capital Stock
or any equity contribution, means the cash proceeds of such issuance, sale or
contribution net of attorneys' fees, accountants' fees, underwriters' or
placement agents' fees, discounts or commissions and brokerage, consultant and
other fees actually incurred in connection with such issuance, sale or
contribution and net of taxes paid or payable as a result thereof.

  "Noteholder" or "Holder" means the Person in whose name a Note is
registered on the registrar's books.

  "Officer" means the Chairman of the Board, the Chief Executive Officer, the
Chief Financial Officer, the President, any Vice President, the Treasurer or the
Secretary of Splitrock.

  "Officers' Certificate" means a certificate signed by two Officers.

  "Opinion of Counsel" means a written opinion from legal counsel who is
acceptable to the Trustee. The counsel may be an employee of or counsel to
Splitrock or the Trustee.

  "Permitted Holders" means Kwok L. Li, William R. Wilson and Linsang
Partners, LLC and any Person acting in the capacity of an underwriter in
connection with a public or private offering of Splitrock's Capital Stock.

  "Permitted Investment" means an Investment by Splitrock or any Restricted
Subsidiary in:

  (1)  Splitrock, a Restricted Subsidiary or a Person that will, upon the making
       of such Investment, become a Restricted Subsidiary; provided, however,
       that the primary business of such Restricted Subsidiary is a
       Telecommunications Business;

  (2)  another Person if as a result of such Investment such other Person is
       merged or consolidated with or into, or transfers or conveys all or
       substantially all its assets to, Splitrock or a Restricted Subsidiary;
       provided, however, that such Person's primary business is a
       Telecommunications Business;

  (3)  Temporary Cash Investments;

  (4)  receivables owing to Splitrock or any Restricted Subsidiary if created or
       acquired in the ordinary course of business and payable or dischargeable
       in accordance with customary trade terms; provided, however, that such
       trade terms may include such concessionary trade terms as Splitrock or
       any such Restricted Subsidiary deems reasonable under the circumstances;

  (5)  Investments in prepaid expenses;

  (6)  loans or advances to employees made in the ordinary course of business of
       Splitrock or such Restricted Subsidiary and not exceeding $2.0 million in
       the aggregate outstanding at any one time;

  (7)  stock, obligations or securities received in settlement of debts created
       in the ordinary course of business and owing to Splitrock or any
       Restricted Subsidiary or in satisfaction of judgments;

  (8)  any Person to the extent such Investment represents the non-cash portion
       of the consideration received for an Asset Disposition that was made
       pursuant to and in compliance with the covenant described under "--
       Certain Covenants -- Limitation on Sale of Assets and Subsidiary Stock";

  (9)  Investments made prior to the Closing Date;

  (10) Investments in Telecommunications Assets not to exceed $30.0 million at
       any onetime outstanding; and

  (11) other Investments, not to exceed the greater of:

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<PAGE>

     .  10% of Total Assets of Splitrock at the time of such Investment (with
        the fair market value of each Investment being measured at the time made
        and without giving effect to subsequent changes in value) and

     .  $30.0 million.

  "Permitted Liens" means, with respect to any Person:

  (a) pledges or deposits by such Person under worker's compensation laws,
      unemployment insurance laws or similar legislation, or good faith deposits
      in connection with bids, tenders, contracts (other than for the payment of
      Indebtedness) or leases to which such Person is a party, or deposits to
      secure public or statutory obligations of such Person or deposits of cash
      or United States government bonds to secure surety or appeal bonds to
      which such Person is a party, or deposits as security for contested taxes
      or import duties or for the payment of rent, in each case Incurred in the
      ordinary course of business;

  (b) Liens imposed by law, such as carriers', warehousemen's and mechanics'
      Liens, in each case for sums not yet due or being contested in good faith
      by appropriate proceedings or other Liens arising out of judgments or
      awards against such Person with respect to which such Person shall then be
      proceeding with an appeal or other proceedings for review;

  (c) Liens for property taxes not yet due or payable or subject to penalties
      for non-payment or which are being contested in good faith by appropriate
      proceedings;

  (d) Liens in favor of issuers of surety bonds issued pursuant to the request
      of and for the account of such Person in the ordinary course of its
      business;

  (e) minor survey exceptions, minor encumbrances, easements or reservations
      of, or rights of others for, licenses, rights-of-way, sewers, electric
      lines, telegraph and telephone lines and other similar purposes, or zoning
      or other restrictions as to the use of real property or Liens incidental
      to the conduct of the business of such Person or to the ownership of its
      properties which were not Incurred in connection with Indebtedness and
      which do not in the aggregate materially adversely affect the value of
      said properties or materially impair their use in the operation of the
      business of such Person;

  (f) Liens to secure Indebtedness permitted pursuant to clauses (b)(i) and
      (b)(vi) of the covenant described under "-- Certain Covenants --
      Limitation on Indebtedness";

  (g) Liens existing on the Closing Date;

  (h) Liens on property or shares of stock of another Person at the time such
      other Person becomes a Subsidiary of such Person; provided, however, that
      such Liens are not created, Incurred or assumed in connection with, or in
      contemplation of, such other Person becoming such a Subsidiary; provided
      further, however, that such Liens do not extend to any other property
      owned by such Person or any of its Subsidiaries;

  (i) Liens on property at the time such Person or any of its Subsidiaries
      acquires the property, including any acquisition by means of a merger or
      consolidation with or into such Person or any Subsidiary of such Person;
      provided, however, that such Liens are not created, Incurred or assumed in
      connection with, or in contemplation of, such acquisition; provided
      further, however, that the Liens do not extend to any other property owned
      by such Person or any of its Subsidiaries;

  (j) Liens securing Indebtedness or other obligations of a Subsidiary of such
      Person owing to such Person or a wholly owned Subsidiary of such Person;

  (k) Liens securing obligations under Interest Rate Agreements so long as such
      obligations under Interest Rate Agreements relate to Indebtedness that is,
      and is permitted under the Indenture to be, secured by a Lien on the same
      property securing such obligations under Interest Rate Agreements;

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<PAGE>

  (l) Liens to secure any Refinancing (or successive Refinancings) as a whole,
      or in part, of any Indebtedness secured by any Lien referred to in the
      foregoing clauses (f), (g), (h) and (i); provided, however, that:

      . such new Lien shall be limited to all or part of the same property that
        secured the original Lien (plus improvements to or on such property);
        and

      . the Indebtedness secured by such Lien at such time is not increased to
        any amount greater than the sum of:

        (A) the outstanding principal amount or, if greater, committed amount
            of the Indebtedness secured by Liens described under clauses (f),
            (g), (h) or (i) at the time the original Lien became a Permitted
            Lien under the Indenture, and

        (B) an amount necessary to pay any fees and expenses, including
            premiums, related to such Refinancings; and

  (m) Liens in favor of the Trustee arising under the provisions of the Escrow
      and Disbursement Agreement and the provisions of the Indenture relating
      thereto.

  Notwithstanding the foregoing, "Permitted Liens" will not include any Lien
described in clauses (f), (h) or (i) above to the extent such Lien applies to
any Telecommunications Assets acquired directly or indirectly from Net Available
Cash pursuant to the covenant described under "-- Certain Covenants --
Limitation on Sales of Assets and Subsidiary Stock."

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

  "Preferred Stock," as applied to the Capital Stock of any Person, means
Capital Stock of any class or classes (however designated) that is preferred as
to the payment of dividends, or as to the distribution of assets upon any
voluntary or involuntary liquidation or dissolution of such Person, over shares
of Capital Stock of any other class of such Person.

  "Principal" of a Note means the principal of the Note plus the premium, if
any, payable on the Note which is due or overdue or is to become due at the
relevant time.

  "Prodigy Agreement" means the Splitrock Full Service Agreement dated as of
June 24, 1997 between Splitrock and Prodigy, Inc. as in effect on the date
hereof.

  "Purchase Money Indebtedness" means Secured Indebtedness (including
Capitalized Lease Obligations, mortgage financings and purchase money
obligations) incurred for the purpose of financing all or any part of the cost
of construction, installation, acquisition, lease, development or improvement by
Splitrock or any Restricted Subsidiary of any Telecommunications Assets of
Splitrock or any Restricted Subsidiary and including any related notes,
Guarantees, collateral documents, instruments and agreements executed in
connection therewith, as the same may be amended, supplemented, modified or
restated from time to time provided, however, that

  (1) the security agreement or conditional sales or other title retention
      contract pursuant to which a Lien on such assets is created shall be
      entered into within 180 days after the purchase or acquisition of such
      assets and shall at all times be confined solely to the assets so
      purchased or acquired, any additions, replacements, modifications and
      accessions thereto and any proceeds and products therefrom,

  (2) at no time shall the aggregate principal amount of the outstanding
      Indebtedness secured thereby be increased, except in connection with the
      purchase of additions and accessions thereto and except in respect of fees
      and other obligations in respect of such Indebtedness and

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<PAGE>

  (3) with respect to any Secured Indebtedness which constitutes Purchase Money
      Indebtedness, the Stated Maturity of such Secured Indebtedness shall not
      exceed the expected depreciable life, as determined by the Company, of the
      Telecommunications Assets securing such Secured Indebtedness.

  "Refinance" means, in respect of any Indebtedness, to refinance, extend,
renew, refund, repay, prepay, redeem, defease or retire, or to issue other
Indebtedness exchange or replacement for, such Indebtedness. "Refinanced" and
"Refinancing" shall have correlative meanings.

  "Refinancing Indebtedness" means Indebtedness that is Incurred to refund,
refinance, replace, renew, repay or extend (including pursuant to any defeasance
or discharge mechanism) any Indebtedness of Splitrock or any Restricted
Subsidiary existing on the date of the Indenture or Incurred in compliance with
the Indenture (including Indebtedness of Splitrock that Refinances Refinancing
Indebtedness); provided, however, that:

  (1) the Refinancing Indebtedness has a Stated Maturity no earlier than the
      Stated Maturity of the Indebtedness being Refinanced,

  (2) the Refinancing Indebtedness has an Average Life at the time such
      Refinancing Indebtedness is Incurred that is equal to or greater than the
      Average Life of the Indebtedness being refinanced,

  (3) such Refinancing Indebtedness is Incurred in an aggregate principal
      amount (or if issued with original issue discount, an aggregate issue
      price) that is equal to or less than the aggregate principal amount (or if
      issued with original issue discount, the aggregate accreted value) then
      outstanding of the Indebtedness being Refinanced and

  (4) if the Indebtedness being Refinanced is subordinated in right of payment
      to the notes, such Refinancing Indebtedness is subordinated in right of
      payment to the notes at least to the same extent as the Indebtedness being
      Refinanced;

provided further, however, that Refinancing Indebtedness shall not include:

  .   Indebtedness of a Restricted Subsidiary that Refinances Indebtedness of
      Splitrock or

  .   Indebtedness of Splitrock or a Restricted Subsidiary that Refinances
      Indebtedness of an Unrestricted Subsidiary.

  "Restricted Subsidiary" means any Subsidiary of Splitrock other than an
Unrestricted Subsidiary.

  "Sale/Leaseback Transaction" means an arrangement relating to property now
owned or hereafter acquired by Splitrock or a Restricted Subsidiary whereby
Splitrock or a Restricted Subsidiary transfers such property to a Person and
Splitrock or such Restricted Subsidiary leases it from such Person, other than
leases between Splitrock and a Wholly Owned Subsidiary or between Wholly Owned
Subsidiaries.

  "Secured Indebtedness" means any Indebtedness of Splitrock secured by a
Lien.

  "Senior Indebtedness" of Splitrock means the principal of, premium (if any)
and accrued and unpaid interest on (including interest accruing on or after the
filing of any petition in bankruptcy or for reorganization of Splitrock,
regardless of whether or not a claim for post-filing interest is allowed in such
proceedings), and fees and other amounts owing in respect of, Bank Indebtedness
and all other Indebtedness of Splitrock, whether outstanding on the Closing Date
or thereafter Incurred, unless in the instrument creating or evidencing the same
or pursuant to which the same is outstanding it is provided that such
obligations are subordinated in right of payment to the notes; provided,
however, that Senior Indebtedness shall not include:

  (1) any obligation of Splitrock to any Subsidiary,

  (2) any liability for Federal, state, local or other taxes owed or owing by
      Splitrock,

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  (3) any accounts payable or other liability to trade creditors arising in the
      ordinary course of business (including Guarantees thereof or instruments
      evidencing such liabilities),

  (4) any Indebtedness or obligation of Splitrock(and any accrued and unpaid
      interest in respect thereof) that by its terms is subordinate or junior in
      any respect to any other Indebtedness or obligation of Splitrock,
      including any Subordinated Obligations,

  (5) any obligations with respect to any Capital Stock, or

  (6) any Indebtedness Incurred in violation of the Indenture.

  "Significant Subsidiary" means any Restricted Subsidiary that would be a
"Significant Subsidiary" of Splitrock within the meaning of Rule 1-02 under
Regulation S-X promulgated by the Commission.

  "Stated Maturity" means, with respect to any security, the date specified in
such security as the fixed date on which the final payment of principal of such
security is due and payable, including pursuant to any mandatory redemption
provision (but excluding any provision providing for the repurchase of such
security at the option of the holder thereof upon the happening of any
contingency beyond the control of the issuer unless such contingency has
occurred).

  "Subordinated Obligation" means, with respect to any Person, any
Indebtedness of such Person (whether outstanding on the Closing Date or
thereafter Incurred) that is subordinate or junior in right of payment to the
notes or any other indebtedness of such Person pursuant to a written agreement.

  "Subsidiary" of any Person means any corporation, association, partnership
or other business entity of which more than 50% of the total voting power of
shares of Capital Stock or other interests (including partnership
interests)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,

  .  such Person and one or more Subsidiaries of such Person or

  .  one or more Subsidiaries of such Person.

  "Subsidiary Guarantee" means each Guarantee of the obligations with respect
to the notes issued by a Person pursuant to the terms of the Indenture.

  "Subsidiary Guarantor" means any Person that has issued a Subsidiary
Guarantee.

  "Telecommunications Assets" means all assets including Capital Stock, rights
(contractual or otherwise) and properties, real or personal, whether tangible or
intangible, used or intended for use in connection with a Telecommunications
Business.

  "Telecommunications Business" means the business of:

  (1) transmitting, or providing services relating to the transmission of, data,
      video or voice through owned or leased transmission facilities,

  (2) constructing, creating, developing or marketing networks, related network
      transmission equipment, software and other devices for use in a
      communication business or

  (3) evaluating, participating or pursuing any other activity or opportunity
      that is primarily related to those identified in (1) or (2) above;

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provided that the determination of what constitutes a Telecommunications
Business shall be made in good faith by our board of directors.

  "Temporary Cash Investments" means any of the following:

  (1) any investment in direct obligations of the United States of America or
      any agency thereof or obligations Guaranteed by the United States of
      America or any agency thereof,

  (2) investments in time deposit accounts, certificates of deposit and money
      market deposits maturing within 180 days of the date of acquisition
      thereof issued by a bank or trust company that is organized under the laws
      of the United States of America, any state thereof or any foreign country
      recognized by the United States of America having capital, surplus and
      undivided profits aggregating in excess of $500.0 million (or the foreign
      currency equivalent thereof) and whose long-term debt is rated "A" (or
      such similar equivalent rating) or higher by at least one nationally
      recognized statistical rating organization (as defined in Rule 436 under
      the Securities Act),

  (3) repurchase obligations with a term of not more than 30 days for
      underlying securities of the types described in clause (1) above entered
      into with a bank meeting the qualifications described in clause (2) above,

  (4) investments in commercial paper, maturing not more than 90 days after the
      date of acquisition, issued by a corporation (other than an Affiliate of
      Splitrock) organized and in existence under the laws of the United States
      of America or any foreign country recognized by the United States of
      America with a rating at the time as of which any investment therein is
      made of "P-1"(or higher) according to Moody's Investors Service, Inc. or
      "A-1" (or higher) according to Standard and Poor's Ratings Service, a
      division of The McGraw-Hill Companies, Inc. ("S&P"), and

  (5) investments in securities with maturities of six months or less from the
      date of acquisition issued or fully guaranteed by any state, commonwealth
      or territory of the United States of America, or by any political
      subdivision or taxing authority thereof, and rated at least "A" by S&P
      or "A" by Moody's Investors Service, Inc.

  "TIA" means the Trust Indenture Act of 1939 (15 U.S.C. secs. 77aaa-77bbbb)
as in effect on the date of the Indenture.

  "Total Assets" means, with respect to any Person, the total Consolidated
assets of such Person and its Restricted Subsidiaries, as shown on the most
recent balance sheet of such Person.

  "Total Consolidated Indebtedness" means, as of any date of determination, an
amount equal to the aggregate amount of all Indebtedness of Splitrock and its
Restricted Subsidiaries, determined on a Consolidated basis in accordance with
GAAP, outstanding as of such date of determination, after giving effect to any
Incurrence of Indebtedness and the application of the proceeds therefrom giving
rise to such determination.

  "Trade Payables" means, with respect to any Person, any accounts payable or
any indebtedness or monetary obligation to trade creditors created, assumed or
Guaranteed by such Person arising in the ordinary course of business in
connection with the acquisition of goods or services.

  "Trustee" means the party named as such in the Indenture until a success or
replaces it and, thereafter, means the successor.

  "Trust Officer" means the Chairman of the Board, the President or any other
officer or assistant officer of the Trustee assigned by the Trustee to
administer its corporate trust matters.

  "Unrestricted Subsidiary" means (1) any Subsidiary of Splitrock that at the
time of determination shall be designated an Unrestricted Subsidiary by our
board of directors in the manner provided below and (2) any

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Subsidiary of an Unrestricted Subsidiary. The Board of Directors may designate
any Subsidiary of Splitrock (including any newly acquired or newly formed
Subsidiary of Splitrock) to be an Unrestricted Subsidiary unless:

  (a) such Subsidiary or any of its Subsidiaries owns any Capital Stock or
      Indebtedness of, or owns or holds any Lien on any property of, Splitrock
      or any other Subsidiary of Splitrock that is not a Subsidiary of the
      Subsidiary to be so designated;

  (b) a Default or Event of Default shall have occurred and be continuing; or

  (c) immediately after giving effect to such designation, Splitrock would not
      be able to Incur $1.00 of Indebtedness under paragraph (a) of the covenant
      entitled "-- Limitation on Indebtedness";

provided, however, that either (A) the Subsidiary to be so designated has total
Consolidated assets of $1,000 or less or (B) if such Subsidiary has Consolidated
assets greater than $1,000, then such designation would be permitted under the
covenant titled "-- Limitation on Restricted Payments." The Board of Directors
may designate any Unrestricted Subsidiary to be a Restricted Subsidiary;
provided, however, that immediately after giving effect to such designation:

  (1) Splitrock could Incur $1.00 of additional Indebtedness under paragraph (a)
      of the covenant described under "-- Certain Covenants -- Limitation on
      Indebtedness" and

  (2) no Default shall have occurred and be continuing.

Any such designation of a Subsidiary as a Restricted Subsidiary or Unrestricted
Subsidiary by our board of directors shall be evidenced to the Trustee by
promptly filing with the Trustee a copy of the resolution of our board of
directors giving effect to such designation and an Officers' Certificate
certifying that such designation complied with the foregoing provisions.

  "U.S. Government Obligations" means direct obligations or certificates
representing an ownership interest in such obligations, of the United States of
America, including any agency or instrumentality thereof, for the payment of
which the full faith and credit of the United States of America is pledged and
which are not callable or redeemable at the issuer's option.

  "Voting Stock" of a Person means all classes of Capital Stock or other
interests, including partnership interests, of such Person then outstanding and
normally entitled, without regard to the occurrence of any contingency, to vote
on the election of directors, managers or trustees thereof.

  "Wholly Owned Subsidiary" means a Restricted Subsidiary of Splitrock all the
Capital Stock of which, other than directors' qualifying shares, is owned by
Splitrock or another Wholly Owned Subsidiary.


               MATERIAL UNITED STATES FEDERAL TAX CONSIDERATIONS

General

  The following is a summary of the material United States federal income tax
consequences relevant to the acquisition, ownership and disposition of the
notes, the warrants and the warrant shares. This summary does not purport to be
a complete analysis of all potential tax effects that may be relevant to holders
of the notes, warrants or the warrant shares. In particular, it does not address
United States federal income tax consequences relevant to holders who are not
U.S. holders (as defined below) and does not deal with tax consequences arising
under the laws of any foreign, state or local jurisdiction. This summary is
based upon the provisions of the Internal Revenue Code of 1986, as amended (the
"Code"), existing and proposed Treasury regulations promulgated thereunder,
published rulings and court decisions, all as in effect and existing on the date
hereof and all of which are subject to change at any time, which change may be
retroactive.

  This summary is not binding on the Internal Revenue Service or on the courts,
and no ruling will be requested

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from the Internal Revenue Service on any issues described below. There can be no
assurance that the Internal Revenue Service will not take a different position
concerning the matters discussed below and that such positions of the Internal
Revenue Service would not be sustained. This summary applies only to U.S.
holders (as defined below) that are the initial holders of the notes, warrants
or warrant shares, who acquired the same for cash and who hold the same as
capital assets within the meaning of Section 1221 of the Code. It does not
address the United States federal income tax consequences to taxpayers who are
subject to special rules (such as financial institutions, tax-exempt
organizations, insurance companies, dealers in securities or currencies and
persons who hold notes, warrants, or warrant shares as a hedge or as a position
in a "straddle" for tax purposes). A "U.S. holder" means a beneficial owner of a
note, warrant, or warrant shares that is, for U.S. federal income tax purposes:

     .  a citizen or individual resident of the United States;

     .  a corporation, partnership or other entity created or organized in or
        under the laws of the United States or any political subdivision
        thereof;

     .  an estate the income of which is subject to U.S. federal income taxation
        regardless of its source; or

     .  a trust, if, in general, the trust is subject to the supervision of a
        court within the United States and one or more U.S. fiduciaries have the
        authority to control all substantial decisions of the trust.

  The following discussion is for general information only. Each prospective
investor is strongly urged to consult with its own tax advisors to determine the
impact of such holder's tax situation on the anticipated tax consequences,
including the tax consequences under state, local, foreign or other tax laws, of
the acquisition, ownership and disposition of the notes, the warrants, or the
warrant shares.


Taxation of the Notes

  Payment of Interest and Original Issue Discount. The stated interest payable
on the notes generally will be taxable to a U.S. holder of notes as ordinary
income at the time that it is paid or accrued in accordance with the U.S.
holder's regular method of accounting for federal income tax purposes.

  The notes were issued with de minimis original issue discount ("OID") for
federal income tax purposes. A debt instrument generally is issued with de
minimis OID if the amount by which its stated redemption price at maturity
exceeds its issue price is less than the product of .0025 multiplied by the
product of the stated redemption price at maturity and the number of complete
years to maturity from the issue date. The issue price of the notes was
determined by allocating the "issue price" of the Units between the notes and
the warrants based on their relative fair market values. De minimis OID is
recognized as capital gain upon the redemption, sale or other taxable
disposition of the debt instrument.

  Market Discount. A U.S. holder that purchases a note at a purchase price less
than the stated redemption price at maturity will be considered to have
purchased the note at a "market discount" equal to such difference. Market
discount, however, will be considered to be zero if it is less than 0.25% of the
stated redemption price at maturity of the note multiplied by the number of
complete years to maturity remaining after the date of its purchase.

  A U.S. holder generally will be required to treat any principal payment on, or
any gain realized on the sale, exchange, retirement or other disposition of, a
note as ordinary income (generally treated as interest income) to the extent of
the market discount which accrued but was not previously included in income.
Unless a U.S. holder irrevocably elects to accrue under a constant-interest
method, market discount accrues ratably and accrued market discount is the total
market discount multiplied by a fraction, the numerator of which is the number
of days the U.S. holder has held the obligation and the denominator of which is
the number of days from the date the U.S. holder acquired the obligation until
its maturity.

  In addition, a U.S. holder may be required to defer all or a portion of its
interest deductions for the taxable year attributable to any indebtedness
incurred or continued to purchase or carry a note purchased with market
discount. Any such deferred interest expense would not exceed the market
discount that accrued during such taxable year and,

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in general, is allowed as a deduction not later than the year in which such
market discount is includible in income.

  A U.S. holder may elect to include market discount in income currently as it
accrues (under either a ratable or constant interest method), in which case the
rules described above regarding the treatment as ordinary income of gain upon
the disposition of a note and upon the receipt of payments of principal and the
deferral of interest deductions will not apply. The election to include market
discount in income currently, once made, applies to all market discount
obligations acquired on or after the first day of the first taxable year to
which the election applies, and may not be revoked without the consent of the
Internal Revenue Service. Under a proposal contained in the President's Fiscal
Year 2001 Budget, a U.S. holder that is an accrual method taxpayer would be
required to include market discount in income as it accrues. The proposal would
be effective for debt instruments acquired on or after the date of enactment.

  Subject to various limitations, a U.S. holder may elect to treat all
"interest" that accrues on any note as original issue discount and calculate
the amount includible in gross income under the constant yield method. For this
purpose, "interest" includes stated and unstated interest, OID, de minimis
OID, acquisition discount, market discount and de minimis market discount as
adjusted by any amortizable bond premium or acquisition premium. Such election,
if made with respect to a market discount obligation, will constitute an
election to include market discount in income currently, and, once made, applies
to all market discount obligations acquired by such U.S. holder on or after the
first day of the first taxable year to which the election applies. The election
is to be made for the taxable year in which the U.S. holder acquired the note
and may not be revoked without the consent of the Internal Revenue Service.

  Bond Premium. If a U.S. holder purchases a note for an amount in excess of the
amount payable at maturity of the note, such holder will be considered to have
purchased the note with "bond premium" equal to the excess of the U.S.
holder's purchase price over the amount payable at maturity (or on an earlier
call date if it results in a smaller amortizable bond premium). A U.S. holder
may elect to amortize such premium using a constant yield method over the
remaining term of the note (or until an earlier call date if it results in a
smaller amortizable bond premium). The amortized amount of such premium for a
taxable year generally will be treated first as a reduction of interest on such
note included in such taxable year to the extent thereof, then as a deduction
allowed in that taxable year to the extent of the U.S. holder's prior interest
inclusions on such note, and finally as a carryforward allowable against the
U.S. holder's future interest inclusions on such note. Such election, once made,
is irrevocable without the consent of the Internal Revenue Service and applies
to all taxable bonds held during the taxable year for which the elections is
made or subsequently acquired.

  Sale, Retirement or Other Taxable Disposition. Upon the sale, retirement,
exchange or other disposition of a note, a U.S. holder generally will recognize
taxable gain or loss in an amount equal to the difference, if any, between the
amount of cash and the fair market value of property received with respect to
such sale, retirement, exchange or other disposition and such holder's adjusted
tax basis in the note. A U.S. holder's adjusted tax basis in a note generally
will be equal to the purchase price of such note, increased by the amount of
market discount previously included in the U.S. holder's gross income, and
reduced by the amount of any amortizable bond premium applied to reduce, or
allowed as a deduction against, interest with respect to such note. Gain or loss
recognized by a U.S. holder on the sale, retirement, exchange or other
disposition of a note generally will be capital gain or loss except with respect
to amounts received upon a disposition attributable to accrued but unpaid
interest or accrued market discount not previously included in income, which in
either case will be taxable as ordinary income. Such capital gain or loss will
be long-term capital gain or loss if the note has been held for more than one
year at the time of the disposition.

  Information Reporting and Backup Withholding. The backup withholding and
information reporting requirements may apply to payments of principal and
interest on a note and to payments or proceeds of the sale or retirement of a
note. The Company, its agent, a broker, the Trustee or any paying agent, as the
case may be, is required to withhold tax from any payment that is subject to
backup withholding at a rate of 31% of such payment if the U.S. holder fails to
furnish its taxpayer identification number (social security number or employer
identification number), to certify that such holder is not subject to backup
withholding rules. Certain U.S. holders (including, among others, all
corporations) are not subject to the backup withholding and reporting
requirements.

  Under current Treasury regulations, backup withholding and information
reporting do not apply to payments

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made by Splitrock or any agent thereof (in its capacity as such) to a holder of
a note who has provided the required certification under penalties of perjury
that it is not a U.S. holder or has otherwise established an exemption (provided
that neither Splitrock nor such agent has actual knowledge that the holder is a
U.S. holder or that the conditions of any other exemption are not in fact
satisfied).

  Any amounts withheld under the backup withholding rules from a payment to a
U.S. holder may be claimed as a credit against such holder's United States
federal income tax liability.

  Effect of Change of Control. Upon a Change of Control, each U.S. holder will
have the right to require Splitrock to repurchase all or any part of such
holder's notes for a price equal to 101% of the principal amount thereof plus
accrued and unpaid interest and liquidated damages, if any, to the date of
payment. Under Treasury regulations, a provision such as the Change of Control
redemption requirement will not affect the yield or maturity date of the notes
unless, based on all facts and circumstances as of the date of issuance, it is
more likely than not that a Change of Control giving rise to the redemption will
occur. The Company will not treat the Change of Control redemption provision of
the notes as affecting the calculation of the yield to maturity of any note.


Taxation of the Warrants

  Characterization of Warrants. Although the matter is not free from doubt, and
the form of the warrants may be respected for federal income tax purposes, it is
possible that from the date of original issuance, the warrants would be treated
for federal income tax purposes as common stock due to, among other things, the
nominal Exercise Price, and lack of any meaningful contingency. As a result of a
supplemental warrant agreement executed on February 24, 2000, Splitrock may, at
its election, (and, prior to the merger, is required to) issue the warrant
shares underlying the remaining outstanding warrants to the warrant agent to
hold in custody for the warrant holders. At that time, Splitrock will eliminate
the exercise price to be paid by the warrant holders upon exercise. The warrant
holders will have the right to instruct the warrant agent how to vote the
underlying warrant shares, will benefit from anti-dilution provisions, and will
be entitled to receive dividends or other distributions paid to holders of
Splitrock common stock. The Company believes that, as a result of the transfer
of shares to the custody agent, a warrant holder likely would be treated for
federal income tax purposes as owning the warrant shares. Accordingly, although
the matter is not free from doubt, the following discussion assumes that the
warrants would likely be properly characterized as stock.

  Exercise. If the form of the warrants prior to the amendment is respected,
and, as a result of the transfer of stock to the warrant agent, the warrants are
treated as stock for federal income tax purposes, the holders may be deemed to
have exchanged their warrants for the underlying warrant shares for federal
income tax purposes at the time Splitrock transfers the shares to the warrant
agent. The holders would not recognize any gain or loss on the deemed exchange,
and the holding period of the stock deemed to be received by the holders should
include the period during which the warrant was held. If the transfer of shares
is a deemed exercise of the warrants. If the transfer of shares is considered
instead to be a deemed exercise of the warrants, then the holder would not
recognize any gain or loss on the deemed exercise, and the holding period would
begin on the day after the deemed exercise. If the form of the warrants prior to
the amendment is not respected and thus holders are treated as owning stock from
the initial issuance of the warrants, then the holders would not recognized any
gain or loss on the receipt of the warrant shares, and the holding period of the
stock received would include the entire period during which the warrant was
held. If the form of the warrants prior to the amendment is not respected and
thus holders are treated as owning stock from the initial issuance of the
warrants, then the holders would not recognize any gain or loss on the receipt
of the warrant shares, and the holding period of the stock received would
include the entire period during which the warrant was held.

  Adjustments. Although the matter is not free from doubt, as a result of the
elimination of the exercise price of the warrants, a warrant holder may have
income in the amount of the exercise price for each warrant share which the
holder is entitled to purchase upon exercise. Further, if the warrants are
treated as stock for federal income tax purposes the issuance of additional
shares pursuant to the antidilution provisions of the warrants may, in some
circumstances, result in constructive distributions to U.S. holders of the
warrants which could be taxable as dividends to such holders under Section 305
of the Code. A U.S. holder's federal income tax basis in the warrant shares
generally would be increased by the amount of any such dividend.

  Disposition. Upon a sale, exchange or other taxable disposition of a warrant
or a share of common stock received upon exercise of a warrant, a holder
generally will recognize gain or loss for federal income tax purposes in an
amount equal to the difference between (i) the sum of the amount of cash and
fair market value of any property received upon such sale exchange or
disposition and (ii) the holder's adjusted tax basis in the warrant or common
stock. Such gain or loss would be long-term capital gain or loss if the holding
period of the warrant or stock in the hands of the holder is held by the holder
for more than one year at the time of sale or exchange.

  It is possible that the form of the warrants would be respected
notwithstanding the transfer of the shares to the warrant agent. If the form of
the warrants is respected, then a U.S. holder of a warrant generally will not
recognize gain or loss upon exercise of the warrant, the U.S. holder's federal
income tax basis in the common stock received will be equal to the holder's
federal income tax basis in the warrant immediately prior to exercise (the cost
of the warrant), plus the amount of cash paid upon exercise, and the holding
period of the common stock acquired upon

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exercise of the warrant will begin on the day after the date of exercise of the
warrant and will not include the period during which the warrant was held.


                                 LEGAL MATTERS

  The validity of the shares of common stock, notes and warrants offered by this
prospectus has been passed upon for us by Winstead, Secrest & Minick, P.C.,
Houston, Texas.


                                    EXPERTS

  The financial statements as of December 31, 1998 and 1997 and for the year
ended December 31, 1998 and for the period from inception (March 5, 1997) to
December 31, 1997 incorporated in this prospectus by reference to the
registration statement on Form S-1 (No. 333-79909), as amended, 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.

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