EXHIBIT 4.11

  Amendment No. 3 to the Loan Documents, dated as of February 11, 2000, among
ICG Equipment, Inc., ICG NetAhead, Inc., ICG Services, Inc., as Parent, certain
 Initial Lender Parties party thereto, Morgan Stanley Senior Funding, Inc., as
 Sole Book-Runner and Lead Arranger, Royal Bank of Canada, as Collateral Agent
and as Administrative Agent for such Lender Parties, Bank of America, N.A., as
     Documentation Agent and Barclays Bank Plc, as Co-Documentation Agent.


                            AMENDMENT NO. 3 TO THE
                                LOAN DOCUMENTS


                                            Dated as of February 11, 2000

         AMENDMENT NO. 3 TO THE CREDIT AGREEMENT dated as of August 12, 1999, as
amended by Amendment No. 1 thereto dated as of September 30, 1999 and Amendment
and Waiver No. 2 thereto dated as of December 29, 1999 (such Credit Agreement as
so amended, the "Credit Agreement") among ICG Equipment, Inc., a Colorado
corporation ("ICG Equipment"), ICG NetAhead, Inc., a Delaware corporation ("ICG
NetAhead" and, together with ICG Equipment, the "Borrowers"), ICG Services,
Inc., as Parent, certain Initial Lender Parties party thereto, Morgan Stanley
Senior Funding, Inc., as Sole Book-Runner and Lead Arranger, Royal Bank of
Canada, as Collateral Agent and as Administrative Agent for such Lender Parties,
Bank of America, N.A., as Documentation Agent and Barclays Bank Plc, as Co-
Documentation Agent. Capitalized terms not otherwise defined in this Amendment
have the same meanings as specified therefor in the Credit Agreement.

         PRELIMINARY STATEMENTS:

         (1)  The Borrowers and the Parent have requested that the Lender
Parties agree to amend the Credit Agreement to enable the Borrowers and the
Parent to make additional capital expenditures in the fiscal year 2000 and to
obtain the capital required to finance these additional capital expenditures.

         (2)  The Lender Parties have agreed to such amendments on the terms and
conditions set forth herein.

         SECTION 1.  Amendments to Credit Agreement. The Credit Agreement is,
                     ------------------------------
effective as of the date hereof and subject to the satisfaction of the
conditions precedent set forth in Section 3, hereby amended as follows:

         (a)  Section 1.01 is amended by amending and restating the following
    definition in its entirety to read as follows:

         ""Applicable Margin" means, at any time, (a) in respect of the Tranche
    A Term Facility and the Working Capital Facility, (i) for the first six
    calendar months following the Effective Date, 3.125% in the case of
    Eurodollar Rate Advances, and 2.125% in the case of Base Rate Advances, and
    (ii) thereafter, a percentage per annum determined by reference to the ICG
    Total Leverage Ratio as set forth below and (b) in respect of the Tranche B
    Term Facility, 3.750% in the case of Eurodollar Rate Advances, and 2.750% in
    the case of Base Rate Advances.


                                       2



     ICG Total Leverage Ratio        Base Rate Advances      Eurodollar Rate Advances
                                                       
             * 10:1                       2.375%                     3.375%

     ** 10:1, and * 7.5:1                 2.000%                     3.000%

     ** 7.5:1, and *** 5.0:1              1.750%                     2.750%

         **** 5.0:1                       1.500%                     2.500%


     __________________
     *    greater than sign
     **   less than or equal to sign
     ***  greater than or equal to sign
     **** less than sign

     The Applicable Margin for each Base Rate Advance shall be determined by
     reference to the ICG Total Leverage Ratio in effect from time to time and
     the Applicable Margin for each Eurodollar Rate Advance shall be determined
     by reference to the ratio in effect on the first day of each Interest
     Period for such Advance; provided, however, that no change in the
     Applicable Margin shall be effective until three Business Days after the
     date on which the Administrative Agent receives the financial statements
     required to be delivered pursuant to Section 5.03(b) or (c), as the case
     may be, and a certificate of the Chief Financial Officer of each Borrower
     demonstrating the ICG Total Leverage Ratio."

         (b)   Section 2.06(b)(ii)(A) shall be amended by adding at the end of
     the parenthetical therein the following:

         "and other than Net Cash Proceeds required to prepay or repay Debt
     permitted pursuant to Section 5.02(b)(iii)(B) and (C) so long as the asset
     that is the subject of such sale, lease, transfer or other disposition
     secures such Debt".

         (c)   Section 5.02(b)(iii)(B) is hereby amended to read in full as
     follows:

         "(B)(x) Debt secured by Liens permitted by Section 5.02(a)(iv) in an
     aggregate amount (together with the aggregate amount outstanding under
     subsection (C) below) not to exceed $475,000,000 which Debt shall be
     incurred in calendar year 2000 and (y) other Debt secured by Liens
     permitted by Section 5.02(a)(iv) not to exceed $25,000,000 during any
     consecutive 12-month period,"

         (d)   Section 5.02 (b)(iii)(C) is hereby amended by (i) deleting the
     figure "$385,000,000" in the second line thereof and replacing such figure
     with the phrase "(together with the aggregate amount outstanding under
     subsection (B) above) $475,000,000" and (ii) deleting the parenthetical
     therein.

         (e)   The second column for each fiscal quarter of the year 2000 of the
     tables in the following Sections are hereby amended in their entirety to
     read:


                                       3


                           (i)      for Section 5.04(a) as follows:

                           "                               2000

                                 1/st/ Quarter             2.5:1
                                 2/nd/ Quarter             1.25:1
                                 3/rd/ Quarter             1.20:1
                                 4/th/ Quarter             1.25:1    "

                           and

                           (ii)     for Section 5.04(b) as follows:

                            "                               2000

                                1/st/ Quarter          $25,000,000
                                2/nd/ Quarter          $32,000,000
                                3/rd/ Quarter          $41,000,000
                                4/th/ Quarter          $69,000,000 "

         (f)   The third, fourth, fifth and sixth lines of the tables in the
     following Sections are hereby amended in their entirety to read:

                           (i)      for Section 5.04(c) as follows:

                           "March 31, 2000                  3.00:1
                            June 30, 2000                   4.00:1
                            September 30, 2000              4.00:1
                            December 31, 2000               3.00:1"

                           and

                           (ii)     for Section 5.04(d) as follows:

                           "March 31, 2000                  9.00:1
                            June 30, 2000                   10.00:1
                            September 30, 2000              10.00:1
                            December 31, 2000               7.00:1"

         (g)   Section 5.04(e) is hereby amended by deleting the ratio "3.75:1"
     in the fourth line thereof and substituting therefor the following:


                                       4

         "(A) For each fiscal quarter set forth below, the ratio set forth below
     for such fiscal quarter:

                         "Fiscal Quarter Ending In            Ratio
                          -------------------------           ------
                          March 31, 2000                      3.75:1
                          June 30, 2000                       3.00:1
                          September 30, 2000                  2.50:1
                          December 31, 2000                   2.75:1

         and (B) for each fiscal quarter thereafter, 3.75:1."

         (h)   The third, fourth, fifth and sixth lines of the tables in the
     following Sections are hereby amended in their entirety to read:

                           (i)      for Section 6.01(p)(i) as follows:

                             "March 31, 2000               $134,000,000
                              June 30, 2000                $145,000,000
                              September 30, 2000           $190,000,000
                              December 31, 2000            $253,000,000"

                           (ii)     for Section 6.01(p)(ii) as follows:

                             "March 31, 2000               $62,400,000
                              June 30, 2000                $57,100,000
                              September 30, 2000           $77,500,000
                              December 31, 2000            $128,000,000"

                           and

                           (iii)    for Section 6.01(p)(v) as follows:

                             "March 31, 2000                 1.75:1
                              June 30, 2000                  1.75:1
                              September 30, 2000             1.25:1
                              December 31, 2000              1.50:1"


                                       5

         (i)   Section 6.01(p)(ii) is also amended by deleting the phrase "the
     fiscal quarter ended June 30, 2000" in clause (B) therein and replacing
     such phrase with the phrase "the fiscal quarters ended June 30, 2000,
     September 30, 2000 and December 31, 2000".

         (j)   The third, fourth, fifth and sixth lines of the table in Section
     6.01(q) are hereby amended in their entirety to read as follows:

                             "March 31, 2000              232,000,000
                              June 30, 2000               407,000,000
                              September 30, 2000          402,000,000
                              December 31, 2000           183,000,000"

         (k)   The proviso in Section 6.01(q) is amended by (i) adding
     immediately after the word "period " in the first line thereof the phrase
     "commencing with the period ending March 31, 2000 " and (ii) adding at the
     end thereof the following:

         "; provided further that ICG and its Subsidiaries shall be entitled to
            ----------------
     make additional Capital Expenditures, in any such period commencing with
     the period March 31, 2000 and ending with the period September 30, 2000, in
     an amount equal to 10% of the amount permitted in the immediately
     succeeding period in accordance with the chart above and the amount
     permitted in such succeeding period shall be reduced by the amount of such
     additional Capital Expenditures."

         SECTION 2. Acknowledgment. Each of the Lender Parties hereby
                    --------------
acknowledges that it has received the forecast for the Fiscal Year 2000 in
satisfaction of the obligations of each applicable Loan Party pursuant to
Section 5.03(d) of the Credit Agreement.

         SECTION 3. Conditions of Effectiveness. This Amendment shall become
                    ---------------------------
effective as of the date first above written when and only when:

         (a)   the Lead Arranger shall have received the following:

         (i)   counterparts of this Amendment executed by the Borrowers, the
     Parent, and the Required Lenders or, as to any of the Lender Parties,
     advice satisfactory to the Lead Arranger that such Lender Party has
     executed this Amendment,

         (ii)  any filings, or recordings, or consents of any Persons requested
     by the Lead Arranger in order to create or perfect a security interest in
     favor of the Secured Parties in any Collateral of the Borrowers, and


                                       6

         (iii) any other items reasonably requested by any Lender Party;

          (b)  all of the accrued fees and expenses of the Agents and the Lender
     Parties (including the accrued fees and expenses of counsel to the Lead
     Arranger, the fees and expenses referred in Sections 7 and 8 of this
     Amendment and all other fees payable in connection with this Amendment)
     shall have been paid in full.

         SECTION 4. Representations and Warranties of the Borrower. The Parent
                    ----------------------------------------------
and each Borrower represent and warrant as follows:

          (a)  Each Loan Party and each of its Subsidiaries (i) is a corporation
     duly organized, validly existing and in good standing under the laws of the
     jurisdiction of its incorporation, (ii) is duly qualified and in good
     standing as a foreign corporation in each other jurisdiction in which it
     owns or leases property or in which the conduct of its business requires it
     to so qualify or be licensed except where the failure to so qualify or be
     licensed could not be reasonably likely to have a Material Adverse Effect
     and (iii) has all requisite corporate power and authority (including,
     without limitation, all governmental licenses, permits and other approvals)
     to own or lease and operate its properties and to carry on its business as
     now conducted and as proposed to be conducted.

          (b)  The execution, delivery and performance by each Loan Party of
     this Amendment and the Transaction Documents as amended hereby, to which it
     is or is to be a party, are within such Loan Party's corporate powers, have
     been duly authorized by all necessary corporate action, and do not (i)
     contravene such Loan Party's charter or bylaws, (ii) violate any law, rule,
     regulation (including, without limitation, Regulation X of the Board of
     Governors of the Federal Reserve System), order, writ, judgment,
     injunction, decree, determination or award, (iii) conflict with or result
     in the breach of, or constitute a default or require any payment to be made
     under, any contract, loan agreement, indenture, mortgage, deed of trust,
     lease or other instrument binding on or affecting any Loan Party, any of
     its Subsidiaries or any of their properties in such a manner as would be
     reasonably likely to have a Material Adverse Effect or (iv) except for the
     Liens created under the Transaction Documents, result in or require the
     creation or imposition of any Lien upon or with respect to any of the
     properties of any Loan Party or any of its Subsidiaries. No Loan Party or
     any of its Subsidiaries is in violation of any such law, rule, regulation,
     order, writ, judgment, injunction, decree, determination or award or in
     breach of any such contract, loan agreement, indenture, mortgage, deed of
     trust, lease or other instrument, the violation or breach of which could be
     reasonably likely to have a Material Adverse Effect.

         (c)   No authorization or approval or other action by, and no notice to
     or filing with, any governmental authority or regulatory body or any other
     third party is required for the due execution, delivery or performance by
     any Loan Party of this Amendment or any of the Transaction Documents, as
     amended hereby, to which it is or is to be a party.


                                       7

         (d)   This Amendment has been duly executed and delivered by the Parent
     and the Borrowers. This Amendment and each of the other Transaction
     Documents, as amended hereby, to which any Loan Party is a party are legal,
     valid and binding obligations of each Loan Party thereto, enforceable
     against such Loan Party in accordance with their respective terms.

         (e)   There is no action, suit, investigation, litigation or proceeding
     affecting any Loan Party or any of its Subsidiaries, including any
     Environmental Action, pending or threatened before any court, governmental
     agency or arbitrator that (i) could be reasonably likely to have a Material
     Adverse Effect or (ii) purports to affect the legality, validity or
     enforceability of this Amendment or any of the other Transaction Documents
     as amended hereby.

         (f)   All filings and other actions necessary or desirable to perfect
     and protect the security interest in the Collateral created under the
     Collateral Documents have been duly made or taken and are in full force and
     effect, and the Collateral Documents create in favor of the Collateral
     Agent for the benefit of the Secured Parties a valid and, together with
     such filings and other actions, perfected first priority security interest
     in the Collateral, securing the payment of the Secured Obligations, and all
     filings and other actions necessary or desirable to perfect and protect
     such security interest have been duly taken. The Loan Parties are the legal
     and beneficial owners of the Collateral free and clear of any Lien, except
     for the liens and security interests created or permitted under the Loan
     Documents.

         (g)   The representations and warranties set forth in each of the
     Transaction Documents are correct on and as of this date, before and after
     giving effect to this Amendment, as though made on and as of such date.

         (h)   No event has occurred and is continuing that constitutes a
     Default. No event has occurred and is continuing that constitutes, or
     would, with the lapse of time or the giving of notice constitute, a default
     under any material agreement to which any Loan Party is a party.

         SECTION 5. Reference to and Effect on the Credit Agreement, the
                    ----------------------------------------------------
Security Agreement, the Notes and the Transaction Documents. (a) On and after
- -----------------------------------------------------------
the effectiveness of this Amendment, each reference in the Credit Agreement to
"this Agreement", "hereunder", "hereof" or words of like import referring to the
Credit Agreement, and each reference in the, Notes and each of the other
Transaction Documents to "the Credit Agreement", "thereunder", "thereof" or
words of like import referring to the Credit Agreement, shall mean and be a
reference to the Credit Agreement, as amended by this Amendment.


                                       8

         (b)   On and after the effectiveness of this Amendment, each reference
     in the Security Agreement to "this Agreement", "hereunder", "hereof" or
     words of like import referring to the Security Agreement, and each
     reference in the Credit Agreement, Notes and each of the other Transaction
     Documents to "the Security Agreement", "thereunder", "thereof" or words of
     like import referring to the Security Agreement, shall mean and be a
     reference to the Security Agreement, as amended by this Amendment.

         (c)   The Credit Agreement, the Security Agreement, the Notes and each
     of the other Transaction Documents, as specifically amended by this
     Amendment, are and shall continue to be in full force and effect and are
     hereby in all respects ratified and confirmed. Without limiting the
     generality of the foregoing, the Collateral Documents and all of the
     Collateral described therein do and shall continue to secure the payment of
     all Obligations of the Loan Parties under the Transaction Documents, in
     each case as amended by this Amendment.

         (d)   The execution, delivery and effectiveness of this Amendment shall
     not, except as expressly provided herein, operate as a waiver of any right,
     power or remedy of any Lender or the Agents under any of the Transaction
     Documents, nor constitute a waiver of any provision of any of the
     Transaction Documents.

         SECTION 6. Consent of the Parent. The Parent, as guarantor under the
                    ---------------------
Parent Guaranty, hereby consents to this Amendment and hereby confirms and
agrees that notwithstanding the effectiveness of this Amendment, the Parent
Guaranty is, and shall continue to be, in full force and effect and is hereby
ratified and confirmed in all respects, except that, on and after the
effectiveness of this Amendment, (i) each reference in the Parent Guaranty to
the "Credit Agreement", "thereunder", "thereof" or words of like import shall
mean and be a reference to the Credit Agreement, as amended by this Amendment,
and (ii) each reference in the Parent Guaranty to the "Security Agreement",
""thereunder", thereof or words of like import shall mean and be a reference to
the Security Agreement as amended by this Amendment.

         SECTION 7. Costs and Expenses. The Borrowers agree jointly and
                    ------------------
severally to pay on demand all reasonable costs and expenses of the Lead
Arranger in connection with the preparation, execution, delivery and
administration, modification and amendment of this Amendment and the other
instruments and documents to be delivered hereunder (including, without
limitation, the reasonable fees and expenses of counsel for the Lead Arranger)
in accordance with the terms of Section 9.04 of the Credit Agreement.

         SECTION 8. Amendment Fee. The Borrowers agree to pay an amount equal to
                    -------------
0.25% of the sum of (i) the aggregate Tranche A Term Commitments held by those
Lenders that have, on or prior to February 11, 2000, executed this Amendment,
(ii) the aggregate Tranche B Term Commitments held by those Lenders that have,
on or prior to February 11, 2000, executed this Amendment and (iii) the
aggregate Working Capital Commitments held by those Lenders


                                       9

that have, on or prior to February 11, 2000, executed this Amendment, payable to
the Administrative Agent for the account of such Lenders, ratably in accordance
with their respective interests in such Tranche A Term Commitments, Tranche B
Term Commitments and Working Capital Commitments.

         SECTION 9. Execution in Counterparts. This Amendment may be executed in
                    -------------------------
any number of counterparts and by different parties hereto in separate
counterparts, each of which when so executed shall be deemed to be an original
and all of which taken together shall constitute but one and the same agreement.
Delivery of an executed counterpart of a signature page to this Amendment by
telecopier shall be effective as delivery of a manually executed counterpart of
this Amendment.

         SECTION 10. Governing Law. This Amendment shall be governed by, and
                     -------------
construed in accordance with, the laws of the State of New York.


         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed by their respective officers thereunto duly authorized, as of the date
first above written.


                                            ICG EQUIPMENT, INC., as Borrower


                                            By /s/ Don Teague
                                               ------------------------------
                                               Title:  Executive Vice President,
                                                       General Counsel and
                                                       Secretary


                                            ICG NETAHEAD, INC., as Borrower


                                            By /s/ Don Teague
                                               ------------------------------
                                               Title:  Executive Vice President,
                                                       General Counsel and
                                                       Secretary


                                            ICG SERVICES, INC., as Parent
                                            Guarantor


                                            By /s/ Don Teague
                                               ------------------------------
                                               Title:  Executive Vice President,
                                                       General Counsel and
                                                       Secretary


                                            MORGAN STANLEY SENIOR FUNDING, INC.,
                                              as Sole Book-Runner, Lead Arranger
                                              and Lender Party


                                            By /s/ T. Morgan Edwards II
                                               Title: Vice President


                                            ROYAL BANK OF CANADA,
                                             as Administrative Agent, Collateral
                                             Agent and Lender Party


                                           By /s/ Kevin K. Cornwell
                                              ------------------------------
                                              Title:  Managing Director


                                            BANK OF AMERICA, N.A.,
                                               as Documentation Agent and Lender
                                               Party

                                            By /s/ Julie A. Schell
                                               ------------------------------
                                               Title:  Vice President


                                            BARCLAYS BANK PLC
                                               as Co-Documentation Agent and
                                               Lender Party

                                            By /s/ Daniele Iacovone
                                               ------------------------------
                                               Title:  Associate Director


                                          Initial Lenders

                                            PARIBAS, LOS ANGELES AGENCY

                                            By  /s/  Darlynn Ernst Kitcher/
                                                /s/  Thomas G. Brandt
                                               ------------------------------
                                               Title:  Vice President/
                                                       Managing Director


                                            FINOVA CAPITAL CORPORATION


                                            By /s/ Andrew J. Pluta
                                               ------------------------------
                                               Title:  Vice President


                                            FIRST UNION NATIONAL BANK


                                            By /s/ Mark L. Cook
                                               ------------------------------
                                               Title:  Senior Vice President


                                            GENERAL ELECTRIC CAPITAL
                                            CORPORATION

                                            By /s/ Thomas P. Waters
                                               ------------------------------
                                               Title:  Senior Vice President


                                            IBM CREDIT
                                            as a Lender

                                            By /s/ Thomas S. Curcio
                                               ------------------------------
                                               Title:  Manager of Credit

                                     S-31


                                            STEIN ROE FLOATING RATE LIMITED
                                            LIABILITY COMPANY


                                            By /s/ Brian W. Good
                                               ------------------------------
                                               Title:  Vice President,
                                                       Stein Roe & Farnham
                                                       Incorporated, as Advisor
                                                       to the Stien Roe Floating
                                                       Rate Limited Liability
                                                       Company


                                            STEIN ROE AND FARNHAM
                                            INCORPORATED
                                            AS AGENT FOR KEYPORT LIFE
                                            INSURANCE COMPANY


                                            By /s/ Brian W. Good
                                               ------------------------------
                                               Title:  Vice President and
                                                       Portfolio Manager


                                           STEIN ROE FARNHAM CLO 1 LTD.
                                           By: Stein Roe & Farnham Incorporated,
                                               as Portfolio Manager

                                           By /s/ Brian W. Good
                                              ------------------------------
                                              Title:  Vice President and
                                                      Portfolio Manager


                                            PILGRIM PRIME RATE TRUST
                                            By: Pilgrim Investment, Inc., as its
                                                Investment Manager

                                            By /s/ Robert L. Wilson
                                               ------------------------------
                                               Title:  Vice President


                                            KZH HIGHLAND-2 LLC


                                            By /s/ Peter Chin
                                               ------------------------------
                                               Title:  Authorized Agent


                                            PILGRIM CLO 1999 - 1 LTD.
                                              By:  Pilgrim Investments, Inc., as
                                                   its investment manager

                                            By /s/ Robert L. Wilson
                                               ------------------------------
                                               Title:  Vice President


                                            FRANKLIN FLOATING RATE TRUST


                                            By /s/ Chauncey Lufkin
                                               ------------------------------
                                               Title:  Vice President


                                            ELT LTD.

                                            By /s/ Kelly C. Walker
                                              ------------------------------
                                              Title:  Authorized Agent


                                           ELF FUNDING TRUST 1
                                           By: Highland Capital Management, L.P.
                                               As Collateral Managers

                                           By /s/ Mark K. Okada
                                              ------------------------------
                                              Name:  Mark K. Okada CFA
                                              Title: Executive Vice President


                                           PAMCO CAYMAN LTD.
                                           By: Highland Capital Management, L.P.
                                               As Collateral Manager

                                           By /s/ Mark K. Okada
                                              ------------------------------
                                              Name:  Mark K. Okada CFA
                                              Title: Executive Vice President


                                            GLENEAGLES TRADING LLC

                                            By /s/ Kelly C. Walker
                                               ------------------------------
                                               Name:  Kelly C. Walker
                                               Title: Vice President