Document:

<PAGE>

                                                                    EXHIBIT 4.48

                       FORM OF SERIES E PREFERRED STOCK

                               FACE OF SECURITY

Series E Preferred Stock                                Series E Preferred Stock

Number                                                  Shares

                         [McLeodUSA Incorporated logo]

Incorporated under the laws of                          See Reverse for Certain
the State of Delaware                                   Definitions and
                                                        Restrictions

                                                        CUSIP 582266 60 7

                                   SERIES E
                          CONVERTIBLE PREFERRED STOCK
                          (PAR VALUE $0.01 PER SHARE)
                 (LIQUIDATION PREFERENCE $2,500.00 PER SHARE)

This certifies that

Is the registered owner of

             FULLY PAID AND NON-ASSESSABLE PREFERRED SECURITIES OF
                            McLeodUSA Incorporated
designated the Series E Convertible Preferred Stock (par value $0.01 per share)
(liquidation preference $2,500.00 per share) (the "Series E Preferred Stock").
The shares of Series E Preferred Stock are transferable on the books and records
of the Registrar, in person or by a duly authorized attorney, upon surrender of
this certificate duly endorsed and in proper form for transfer. The
designations, rights, privileges, restrictions, preferences and other terms and
provisions of the Series E Preferred Stock represented hereby are issued and
shall in all respects be subject to the provisions of the Certificate of
Designation of the Powers, Preferences and Relative, Participating, Optional and
other Special Rights of Series E Convertible Preferred Stock and Qualifications,
Limitations and Restrictions thereof dated September 30, 2001, as the same may
be amended from time to time (the "Certificate of Designation").  Capitalized
terms used herein but not defined shall have the meaning given them in the
Certificate of Designation.  The Company will provide a copy of the Certificate
of Designation to a Holder without charge upon written request to the Company at
its principal place of business.
<PAGE>

Reference is hereby made to select provisions of the Series E Preferred Stock
set forth on the reverse hereof, and to the Certificate of Designation, which
select provisions and the Certificate of Designation shall for all purposes have
the same effect as if set forth at this place.

Upon receipt of this certificate, the Holder is bound by the Certificate of
Designation and is entitled to the benefits thereunder.

This certificate is not valid unless countersigned and registered by the
Transfer Agent and Registrar.

WITNESS the facsimile signatures of the duly authorized officers of the Company.

Dated:

McLeodUSA Incorporated

/s/ Randall Rings, Secretary

/s/ Clark E. McLeod, Chairman
<PAGE>

                              REVERSE OF SECURITY

                             McLeodUSA Incorporated

          The shares of Series E Preferred Stock evidenced by this certificate
shall be redeemable as provided in the Certificate of Designation and the
Company's Amended and Restated Certificate of Incorporation. The shares of
Series E Preferred Stock evidenced by this certificate shall be convertible into
the Company's Class A Common Stock in the manner and according to the terms set
forth in the Certificate of Designation.

          The company is authorized to issue more than one class or series of
stock.  As required under Delaware law, the Company shall furnish to any Holder
upon request and without charge, a full summary statement of the designations,
voting rights, preferences, limitations and special rights of the shares of each
class or series authorized to be issued by the Company so far as they have been
fixed and determined and the authority of the Board of Directors to fix and
determine the designations, voting rights, preferences, limitations and special
rights of the classes and series of securities of the Company.

          The shares of Series E Preferred Stock represented by this certificate
have not been registered under the Securities Act of 1933, as amended (the "1933
Act"), or under any applicable state laws. The shares of Series E Preferred
Stock represented by this certificate have been acquired by the registered owner
hereof for investment and not with a view to or for sale in connection with any
distribution thereof within the meaning of the 1933 Act.  The shares may not be
sold, pledged, transferred or assigned except in a transaction which is exempt
under the provisions of the 1933 Act or any applicable state securities laws, or
pursuant to an effective registration statement or in a transaction otherwise in
compliance with applicable federal and state securities laws.

          The sale, pledge, transfer, assignment or other disposition of the
shares of Series E Preferred Stock represented by this certificate is restricted
by and subject to the provisions of a Stock Purchase Agreement dated as of
September 30, 2001, a copy of which is available upon request for inspection at
the offices of the Company.  Any such request should be addressed to the
Secretary of the Company.

          The following abbreviations, when used in the inscription on the face
of this certificate, shall be construed as through they were written out in full
according to applicable laws or regulations:

          TEN COM --    as tenants in common
          TEN ENT --    as tenants by the entireties
          JT TEN --     as joint tenants with right
                        of survivorship and not as
                        tenants in common
<PAGE>

          UNIF GIFT MIN ACT --                   Custodian
                              -------------------         ------------------
                                    (Cust)                      (Minor)
                under Uniform Gift to Minors
                Act
                   -------------------------
                           (State)

FOR VALUE RECEIVED,                               , hereby sells, assigns and
                   -------------------------------
transfers unto

Please insert social security or other
Identifying number of assignee

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

--------------------------------------------------------------------------------
 (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

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

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

--------------------------------------------------------------------------------
                                                                Shares
----------------------------------------------------------------
of the Series E Preferred Stock represented by this Certificate, does hereby
irrevocably constitute and appoint
                                  ----------------------------------------------
                                                                 agent to
-----------------------------------------------------------------
transfer the said Series E Preferred Stock on the books of the Corporation with
full power of substitution in the premises.

Dated
     -------------------------
                                      X
                                       -----------------------------------
                                      X
                                       -----------------------------------
                                       NOTICE: THE SIGNATURE(S) TO THIS
                                       ASSIGNMENT MUST CORRESPOND WITH THE
                                       NAME(S) AS WRITTEN UPON THE FACE OF THIS
                                       CERTIFICATE IN EVERY PARTICULAR, WITHOUT
                                       ALTERATION OR ENLARGEMENT OR ANY CHANGE
                                       WHATEVER.

SIGNATURE(S) GUARANTEED:

By
  -------------------------------
THE SIGNATURE(S) SHOULD BE GUARANTEED
BY AN ELIGIBLE GUARANTOR INSTITUTION
(BANKS, STOCKBROKERS, SAVINGS AND
LOAN ASSOCIATIONS AND CREDIT UNIONS
WITH MEMBERSHIP IN AN APPROVED
SIGNATURE GUARANTEE MEDALLION PROGRAM),
PURSUANT TO S.E.C. RULE 17Ad-15.)<PAGE>

                                                                   EXHIBIT 10.54

                   EIGHTH AMENDMENT TO COST SHARING NATIONAL
                                 IRU AGREEMENT

     THIS EIGHTH AMENDMENT TO COST SHARING NATIONAL IRU AGREEMENT ("Amendment")
is made and entered into as of the ____ day of December 2000 (the "Amendment
Effective Date"), by and between LEVEL 3 COMMUNICATIONS, LLC, a Delaware limited
liability company ("Grantor") and MCLEODUSA INFORMATION SERVICES, INC. (f/k/a
Splitrock Services, Inc.), a Delaware corporation ("Grantee").  This Amendment
modifies and amends that certain Cost Sharing National IRU Agreement dated
April 26, 1999 between Grantor and Grantee (the "Agreement"). Capitalized terms
used but not defined herein shall have the meanings set forth in the Agreement.

                                    RECITALS
                                    --------

     A.  The parties desire to amend the Intercity Route Schedule and the
Scheduled Completion Dates and fiber counts for certain Segments, subject to and
in accordance with the terms and provisions set forth in this Amendment.

     B.  The parties desire to amend the Acceptance Testing procedures of the
Grantee Fibers, subject to and in accordance with the terms and provisions set
forth in this Amendment.

     C.  The parties desire to amend the procedures for obtaining future space
in the Facilities, subject to and in accordance with the terms and provisions
set forth in this Amendment.

                               TERMS OF AMENDMENT
                               ------------------

     Accordingly, in consideration of the foregoing and other good and valuable
consideration, the receipt and sufficiency of which is hereby acknowledged,
Grantor and Grantee hereby agree as follows:

                                   ARTICLE 1
                 REVISION TO GRANTOR INTERCITY ROUTE SCHEDULES
                 ---------------------------------------------

1.01  The Exhibit "B" attached to the Agreement (Grantor Intercity Route
          -----------
Schedule), as amended by the Second Amendment dated March 30, 2000 and the
Seventh Amendment dated September 25, 2000, is hereby deleted and is replaced by
the Exhibit "B" attached hereto (Grantor Intercity Route Schedule).
    -----------

1.02  The Exhibit "A-1" attached to the Seventh Amendment, dated September 25,
          -------------
2000 (First Additional Intercity Fibers), is hereby deleted and is replaced by
the Exhibit "A-1" attached hereto (First Additional Intercity Fibers).
    -------------

CONFIDENTIAL--Eighth Amendment
Page 1

                                 CONFIDENTIAL
                                   TREATMENT
                                    REQUEST
<PAGE>

1.03  The Exhibit "A-2" attached to the Seventh Amendment dated September 25,
          -------------
2000 (Second Additional Intercity Fibers) is hereby deleted and is replaced by
the Exhibit "A-2" attached hereto (Second Additional Intercity Fibers).
    -------------

1.04  Section 1.02 of the Seventh Amendment is hereby deleted and is replaced by
the following Section 1.02:

                                     (***)

1.05  Section 2.02 of the Seventh Amendment is hereby deleted and is replaced by
the following Section 2.02:

                                     (***)

     Grantee has already paid to Grantor $(***) toward twenty five percent (25%)
     of the IRU Contribution.

                                   ARTICLE 2
                               SEGMENT REVISIONS
                               -----------------
                                     (***)

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                                     (***)

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</TABLE>

CONFIDENTIAL--Eighth Amendment
Page 2

                                 CONFIDENTIAL
                                   TREATMENT
                                    REQUEST
<PAGE>

                                     (***)

<TABLE>
<S>           <C>                      <C>                  <C>            <C>
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                                     (***)

2.04  The fibers located in the new Segment identified in Section 2.01 and
Section 2.02 and the additional fibers identified in Section 2.02 shall be
considered Grantee Fibers under the Agreement.  The IRU with respect to such
fibers shall commence as of the IRU Effective Date for the relevant Segment.

                                     (***)

                                   ARTICLE 3
                       ACCEPTANCE TESTING SPECIFICATIONS
                       ---------------------------------

     The Exhibit "I" attached to the Agreement (Acceptance Testing Procedures
         -----------
and Standards) is hereby deleted and is replaced by the Exhibit "I" attached
                                                        -----------
hereto (Acceptance Testing Procedures and Standards).

                                   ARTICLE 4
                                FACILITIES SPACE
                                ----------------

                                     (***)

                                   ARTICLE 5
                         REVISION TO GRANTOR SYSTEM MAP
                         ------------------------------

     The Exhibit "A" attached to the Agreement (Grantor System Map) is hereby
         -----------
deleted and is replaced by the Exhibit "A" attached hereto (Grantor System Map).
                               -----------

                                   ARTICLE 6
                           GRANTEE SPACE REQUIREMENTS
                           --------------------------

     The Exhibit "K" attached to the Agreement (Grantee Space Requirements), as
         -----------
further amended by the Seventh Amendment, is hereby deleted and is replaced by
the Exhibit "K" attached hereto (Grantee Space Requirements).
    -----------

CONFIDENTIAL--Eighth Amendment
Page 3

                                 CONFIDENTIAL
                                   TREATMENT
                                    REQUEST
<PAGE>

                                   ARTICLE 7
                                  RATIFICATION
                                  ------------

     Except as amended by the First, Second, Third, Fourth, Fifth, Sixth,
Seventh and this Eighth Amendment, the original terms and provisions of the
Agreement shall continue in full force and effect and the Agreement, as amended
by the First, Second, Third, Fourth, Fifth, Sixth, Seventh and this Eighth
Amendment, is hereby ratified and confirmed.

     IN WITNESS WHEREOF, Grantor and Grantee have executed this Amendment as of
the date first written above.

LEVEL 3 COMMUNICATIONS, LLC         MCLEODUSA INFORMATION SERVICES, INC.
                                    (f/k/a Splitrock Services, Inc.)

By: ____________________________    By: ____________________________

Title: _________________________    Title: _________________________

CONFIDENTIAL--Eighth Amendment
Page 4

                                 CONFIDENTIAL
                                   TREATMENT
                                    REQUEST
<PAGE>

                                  Exhibit "A"
                                  -----------
                               Grantor System Map
                               ------------------

                 [GRAPHIC OF GRANTOR SYSTEM MAP APPEARS HERE]

CONFIDENTIAL--Eighth Amendment
Page 5

                                 CONFIDENTIAL
                                   TREATMENT
                                    REQUEST
<PAGE>

                                 Exhibit "A-1"
                                 -------------
                       First Additional Intercity Fibers
                       ---------------------------------
                              Segments/City Pairs
                              -------------------

<TABLE>
<CAPTION>
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CONFIDENTIAL--Eighth Amendment
Page 6

                                 CONFIDENTIAL
                                   TREATMENT
                                    REQUEST
<PAGE>

<TABLE>
<CAPTION>
---------------------------------------------------------------------------------------------------------------------
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</TABLE>

CONFIDENTIAL--Eighth Amendment
Page 7

                                 CONFIDENTIAL
                                   TREATMENT
                                    REQUEST
<PAGE>

                                 Exhibit "A-2"
                                 -------------
                       Second Additional Intercity Fibers
                       ----------------------------------
                              Segments/City Pairs
                              -------------------

<TABLE>
<CAPTION>
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CONFIDENTIAL--Eighth Amendment
Page 8

                                 CONFIDENTIAL
                                   TREATMENT
                                    REQUEST
<PAGE>

<TABLE>
<CAPTION>
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CONFIDENTIAL--Eighth Amendment
Page 9

                                 CONFIDENTIAL
                                   TREATMENT
                                    REQUEST
<PAGE>

                                  Exhibit "B"
                                  -----------
                              Segments/City Pairs
                              -------------------
                        Grantor Intercity Route Schedule
                        --------------------------------

<TABLE>
<CAPTION>
-------------------------------------------------------------------------------------------------------------------------
  Route         City Pairs       Estimated Route   Fiber Count     Price per      Estimated IRU         IRU Scheduled
 Segment                              Miles                          mile             fee/1/           Completion Date
-------------------------------------------------------------------------------------------------------------------------
<S>       <C>                   <C>                <C>             <C>           <C>                  <C>
            NORTHWEST DISTRICT
-------------------------------------------------------------------------------------------------------------------------
  (***)           (***)               (***)           (***)          (***)            (***)                 (***)
-------------------------------------------------------------------------------------------------------------------------
                  (***)               (***)           (***)          (***)            (***)                 (***)
-------------------------------------------------------------------------------------------------------------------------
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-------------------------------------------------------------------------------------------------------------------------
</TABLE>
---------------
/1/  Estimated IRU Contribution:  IRU fee to be determined by actual route miles

CONFIDENTIAL--Eighth Amendment
Page 10

                                 CONFIDENTIAL
                                   TREATMENT
                                    REQUEST
<PAGE>

<TABLE>
<S>       <C>                   <C>                <C>             <C>           <C>                  <C>
-------------------------------------------------------------------------------------------------------------------------
                  (***)
-------------------------------------------------------------------------------------------------------------------------
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-------------------------------------------------------------------------------------------------------------------------
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</TABLE>

CONFIDENTIAL--Eighth Amendment
Page 11

                                 CONFIDENTIAL
                                   TREATMENT
                                    REQUEST
<PAGE>

<TABLE>
<S>       <C>                   <C>                <C>             <C>           <C>                  <C>
-------------------------------------------------------------------------------------------------------------------------
                  (***)
-------------------------------------------------------------------------------------------------------------------------
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-------------------------------------------------------------------------------------------------------------------------
                             (***)    (***)
-------------------------------------------------------------------------------------------------------------------------
</TABLE>

The Scheduled Completion Date shall be the last day of the month listed as the
IRU Scheduled Completion Date.

CONFIDENTIAL--Eighth Amendment
Page 12

                                 CONFIDENTIAL
                                   TREATMENT
                                    REQUEST
<PAGE>

                                  Exhibit "I"
                                  -----------
                  Acceptance Testing Procedures and Standards
                  -------------------------------------------

After Grantor has completed end-to-end connectivity on the fibers, bi-
directional span testing with an Optical Time Domain Reflectometer ("OTDR") will
be done.  Once the pigtails have been spliced, loss measurements will be
recorded using an industry-accepted laser source and a power meter.  OTDR traces
will be taken and splice loss measurements will be recorded.  Grantor will store
OTDR traces on data sheets.  Copies of all data sheets will be available to
Grantee.

The power loss measurements shall be made at 1550 nm, and performed bi-
directionally.

OTDR traces shall be taken in both directions at 1550 nm.

Guaranteed span loss shall include loss from fiber attenuation, splices and
connectors coupling cable to the Grantor-designated optical termination panel.
The loss shall not include the fiber/cable and connectors from the Grantor-
designated optical termination panel to Grantee's colocation space.  Average
loss per span shall be calculated on a fiber length basis only.  The average
loss per span shall not exceed 0.25 dB/km.

The fibers shall be terminated to the Grantor-designated optical termination
panel with SC-PC connectors, unless another type of connector is specified.
Pigtails and jumpers shall be manufactured with standard single mode fiber or
equivalent.

Testing for Segments for which the Segment End Point is other than a Grantor
point of presence shall be performed in a coordinated fashion, so that Grantee
shall connect and test the fiber owned by it in conjunction with Grantor's
testing of the Grantee Fibers. In the event that the entire tested portion does
not satisfy the testing criteria set forth herein, Grantee and Grantor shall
work together in good faith to pinpoint the cause of the problem and each party
shall be responsible for the timely performance of such repairs on the fibers
owned by it (so that Grantor shall only be responsible for repairs needed to
bring the Grantee Fibers into compliance with this Exhibit).  Grantor may (in
the event of a dispute respecting testing and acceptance of the Grantee Fibers
within any such Segment) arrange to have the Grantee Fibers tested only to the
Segment End Point and, if such Grantee Fibers meet the testing criteria set
forth herein, Grantee shall be obligated to accept and pay for such Grantee
Fibers (notwithstanding the fact that the fibers connected to Grantor's point of
presence may not be functioning properly).

CONFIDENTIAL--Eighth Amendment
Page 13

                                 CONFIDENTIAL
                                   TREATMENT
                                    REQUEST
<PAGE>

                                  Exhibit "K"
                           Grantee Space Requirements

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------
                                                                                              (***)
------------------------------------------------------------------------------------------------------------------
(***)                                (***)                          (***)          (***)              (***)
------------------------------------------------------------------------------------------------------------------
<S>               <C>                                           <C>            <C>            <C>
                  (***)
------------------------------------------------------------------------------------------------------------------
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------------------------------------------------------------------------------------------------------------------
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------------------------------------------------------------------------------------------------------------------
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------------------------------------------------------------------------------------------------------------------
</TABLE>

CONFIDENTIAL--Eighth Amendment
Page 14

                                 CONFIDENTIAL
                                   TREATMENT
                                    REQUEST
<PAGE>

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------
                                                                                              (***)
------------------------------------------------------------------------------------------------------------------
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------------------------------------------------------------------------------------------------------------------
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</TABLE>

CONFIDENTIAL--Eighth Amendment
Page 15

                                 CONFIDENTIAL
                                   TREATMENT
                                    REQUEST
<PAGE>

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------
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------------------------------------------------------------------------------------------------------------------
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</TABLE>

CONFIDENTIAL--Eighth Amendment
Page 16

                                 CONFIDENTIAL
                                   TREATMENT
                                    REQUEST
<PAGE>

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------
                                                                                              (***)
------------------------------------------------------------------------------------------------------------------
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------------------------------------------------------------------------------------------------------------------
<S>               <C>                                           <C>            <C>            <C>
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</TABLE>

CONFIDENTIAL--Eighth Amendment
Page 17

                                 CONFIDENTIAL
                                   TREATMENT
                                    REQUEST
<PAGE>

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------
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------------------------------------------------------------------------------------------------------------------
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------------------------------------------------------------------------------------------------------------------
<S>               <C>                                           <C>            <C>            <C>
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</TABLE>

CONFIDENTIAL--Eighth Amendment
Page 18

                                 CONFIDENTIAL
                                   TREATMENT
                                    REQUEST
<PAGE>

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------
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------------------------------------------------------------------------------------------------------------------
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</TABLE>

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                                 CONFIDENTIAL
                                   TREATMENT
                                    REQUEST
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CONFIDENTIAL--Eighth Amendment
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                                 CONFIDENTIAL
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