Exhibit 99.1

               SUPPLEMENTAL  INDENTURE (this "Supplemental  Indenture") dated as
               of  October  20,  2004,  among  LEVEL 3  COMMUNICATIONS,  LLC,  a
               Delaware  Limited  Liability  Company  (the "New  Guarantor"),  a
               direct or indirect subsidiary of Level 3 Communications, Inc. (or
               its  successor),  a  Delaware  corporation  ("Parent"),  LEVEL  3
               FINANCING,  INC., a Delaware corporation (the "Issuer") on behalf
               of itself and the Guarantors (the "Existing Guarantors"), if any,
               under the Indenture  referred to below, and THE BANK OF NEW YORK,
               a New York banking  corporation,  as trustee  under the indenture
               referred to below (the "Trustee").


                              W I T N E S S E T H :

     WHEREAS the Issuer and Parent have heretofore executed and delivered to the
Trustee an Indenture dated as of October 1, 2003 (the  "Indenture";  capitalized
terms used but not defined  herein having the meanings  assigned  thereto in the
Indenture), providing for the issuance of its 10.75% Senior Notes Due 2011;

     WHEREAS the  Indenture  permits the New Guarantor to execute and deliver to
the Trustee a supplemental  indenture  pursuant to which the New Guarantor shall
unconditionally  guarantee  all the Issuer's  obligations  under the  Securities
pursuant to a Guarantee on the terms and conditions set forth herein;

     WHEREAS  the  Guarantee  contained  in this  Supplemental  Indenture  shall
constitute a "Restricted  Subsidiary  Guarantee",  and the New  Guarantor  shall
constitute a "Guarantor", for all purposes of the Indenture; and

     WHEREAS  pursuant to  Section 901  and Section 1307 of the  Indenture,  the
Trustee and the Issuer are  authorized to execute and deliver this  Supplemental
Indenture;

     NOW  THEREFORE,  in  consideration  of the foregoing and for other good and
valuable  consideration,  the receipt of which is hereby  acknowledged,  the New
Guarantor, the Issuer, the Existing Guarantors and the Trustee mutually covenant
and agree for the equal and ratable  benefit of the holders of the Securities as
follows:






     1.  Agreement to Guaranty.  The New Guarantor  hereby  agrees,  jointly and
severally with all the existing  Guarantors,  to  unconditionally  guarantee the
Issuer's  obligations  under the  Securities  on the terms  and  subject  to the
conditions set forth in Article 13 of the Indenture and to be bound by all other
applicable provisions of the Indenture and the Securities.

     2.  Successors and Assigns.  This  Supplemental  Indenture shall be binding
upon the New  Guarantor  and its  successors  and assigns and shall enure to the
benefit of the successors and assigns of the Trustee and the Holders and, in the
event of any transfer or assignment of rights by any Holder or the Trustee,  the
rights and  privileges  conferred  upon that party in the  Indenture  and in the
Securities  shall  automatically  extend to and be vested in such  transferee or
assignee, all subject to the terms and conditions of this Indenture.

     3. No  Waiver.  Neither  a failure  nor a delay on the part of  either  the
Trustee or the Holders in exercising  any right,  power or privilege  under this
Supplemental  Indenture,  the  Indenture or the  Securities  shall  operate as a
waiver  thereof,  nor shall a single or partial  exercise  thereof  preclude any
other or further exercise of any right, power or privilege. The rights, remedies
and  benefits  of the  Trustee  and the  Holders  herein and  therein  expressly
specified are  cumulative  and not  exclusive of any other  rights,  remedies or
benefits which either may have under this Supplemental Indenture,  the Indenture
or the Securities at law, in equity, by statute or otherwise.

     4. Modification.  No modification,  amendment or waiver of any provision of
this  Supplemental  Indenture,  nor  the  consent  to any  departure  by the New
Guarantor therefrom, shall in any event be effective unless the same shall be in
writing  and signed by the  Trustee,  and then such  waiver or consent  shall be
effective only in the specific  instance and for the purpose for which given. No
notice to or demand  on the New  Guarantor  in any case  shall  entitle  the New
Guarantor to any other or further notice or demand in the same, similar or other
circumstances.

     5. Opinion of Counsel. Concurrently with the execution and delivery of this
Supplemental  Indenture,  the Issuer shall  deliver to the Trustee an Opinion of
Counsel to the effect that this Supplemental Indenture has been duly authorized,
executed  and  delivered by each of the New  Guarantor  and the Issuer and that,
subject to the  application of bankruptcy,  insolvency,  moratorium,  fraudulent
conveyance or transfer and other similar

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laws relating to creditors'  rights  generally and to the  principles of equity,
whether considered in a proceeding at law or in equity, the Guarantee of the New
Guarantor  is a  legal,  valid  and  binding  obligation  of the New  Guarantor,
enforceable against the New Guarantor in accordance with its terms.

     6.  Ratification of Indenture;  Supplemental  Indentures Part of Indenture.
Except as expressly  amended hereby,  the Indenture is in all respects  ratified
and confirmed and all the terms,  conditions and provisions thereof shall remain
in full force and effect.  This Supplemental  Indenture shall form a part of the
Indenture  for all  purposes,  and every  holder  of  Securities  heretofore  or
hereafter authenticated and delivered shall be bound hereby.

     7. Governing  Law. THIS  SUPPLEMENTAL  INDENTURE  SHALL BE GOVERNED BY, AND
CONSTRUED  IN  ACCORDANCE  WITH,  THE LAWS OF THE STATE OF NEW YORK BUT  WITHOUT
GIVING  EFFECT TO  APPLICABLE  PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT
THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY.

     8.  Counterparts.  The  parties  may  sign any  number  of  copies  of this
Supplemental  Indenture.  Each signed copy shall be an original, but all of them
together represent the same agreement.

     9. Effect of Headings. The Section headings herein are for convenience only
and shall not effect the construction thereof.




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     IN WITNESS  WHEREOF,  the parties  hereto  have  caused  this  Supplemental
Indenture to be duly executed as of the date first above written.

                                                   LEVEL 3 COMMUNICATIONS, LLC,
                                                      By
                                                         /s/ Neil J. Eckstein
                                                    Name:  Neil J. Eckstein
                                                    Title: Senior Vice President


                                                  LEVEL 3 FINANCING,  INC., on
                                                  behalf of itself as the Issuer
                                                  and the Existing Guarantors,
                                                  if any,

                                                      By
                                                       /s/ Timothy J. Gallagher
                                                    Name:  Timothy J. Gallagher
                                                    Title: Sr. Vice President


                                               THE BANK OF NEW YORK, as Trustee,
                                                    By
                                                        /s/ Sandee Parks
                                                    Name: Sandee Parks
                                                    Title: Vice President


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