EXECUTION COPY


================================================================================
                          Fourth Supplemental Indenture


                           Dated as of October 6, 1999


                                      among


                             American Skiing Company


                                       and


                    United States Trust Company of New York,
                                   as Trustee,


                                       and


                           the Guarantors named herein


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

                              Series A and Series B
                          12% Senior Subordinated Notes
                                    Due 2006

================================================================================






         FOURTH SUPPLEMENTAL INDENTURE (this "Supplemental Indenture"), dated as
of October 6, 1999, among American Skiing Company, a Maine corporation  ("ASC"),
the Guarantors  listed on the signature pages hereof under the heading  Existing
Guarantors (the "Existing Guarantors"), each of Blunder Bay Development Co., ASC
Leasing, Inc., Orlando Resort Corporation,  ASC Transportation,  Inc., ASC Utah,
Steamboat Development Corporation,  Steamboat Ski & Resort Corporation, Heavenly
Corporation,  Heavenly Valley,  Limited  Partnership,  and Heavenly Ski & Resort
Corporation  (each, an "Additional  Guarantor"  and,  together with the Existing
Guarantors,  the "Guarantors"),  and United States Trust Company of New York, as
trustee under the Indenture referred to below (the "Trustee").

                               W I T N E S S E T H

         WHEREAS,  pursuant to the Indenture,  dated as of June 28, 1996,  among
ASC East,  Inc.  ("ASC  East"),  the  Guarantors  named  therein (the  "Original
Guarantors"),  and the Trustee (the "Original Indenture"),  ASC East duly issued
its 12% Senior  Subordinated  Notes Due 2006 (the "Securities") in the aggregate
principal amount of $120 million;

         WHEREAS,   the  Original   Indenture  was  amended  by  (i)  the  First
Supplemental  Indenture,  dated as of November  12,  1997,  among ASC East,  the
Original Guarantors,  and the Trustee,  (ii) the Second Supplemental  Indenture,
dated as of September 4, 1998, among ASC East, the Existing Guarantors,  and the
Trustee, and (iii) the Third Supplemental Indenture, dated as of August 6, 1999,
among  ASC  East,  the  Existing  Guarantors,  and  the  Trustee  (the  Original
Indenture, as so amended and supplemented, the "Indenture");

         WHEREAS,  on or prior to the date hereof,  ASC East and ASC West,  Inc.
shall have merged with and into their parent, ASC (the "Merger");

         WHEREAS,  it is intended  that,  upon the effective date of the Merger,
ASC shall succeed to, and be  substituted  for and may exercise  every right and
power of ASC East under the Indenture,  and shall,  pursuant to Section 5.01(ii)
of the Indenture,  enter into this  Supplemental  Indenture with the Trustee and
the  Guarantors,  agreeing to be bound by all of the terms and provisions of the
Indenture as amended hereby;

         WHEREAS,  upon  the  effective  date  of the  Merger,  each  Additional
Guarantor shall have become a subsidiary of ASC, and ASC shall have provided the
Trustee with an Officers'  Certificate to the effect that none of the Additional
Guarantors has been designated as an Unrestricted  Subsidiary under the terms of
the Indenture;

         WHEREAS,  it is intended  that,  upon the effective date of the Merger,
each of the Additional  Guarantors shall become a Guarantor under the Indenture,
and each Additional Guarantor shall,  pursuant to Section 4.16 of the Indenture,
(i) enter into this  Supplemental  Indenture  agreeing to be bound by all of the
terms and  provisions  of the  Indenture  as amended  hereby and (ii)  execute a
Subsidiary Guarantee;






         WHEREAS,  pursuant to Section 9.01 of the Indenture,  the Indenture may
be  amended  or  supplemented  without  the  consent  of any Holder of a Note to
provide for the assumption of ASC East's rights and obligations  under the Notes
and the  Indenture  in the case of a merger and for the  addition of a Guarantor
pursuant to Section 4.16 of the Indenture;

         WHEREAS,  ASC, each of the  Guarantors  and the Trustee desire and have
agreed to execute and deliver this Supplemental Indenture as herein provided and
all conditions and requirements  necessary to make this Supplemental Indenture a
valid,  binding  and legal  instrument  in  accordance  with its terms have been
performed and  fulfilled and the execution and delivery  hereof have been in all
respects duly authorized by all necessary parties.

         NOW  THEREFORE,  for and in  consideration  of the  premises  contained
herein,  it is mutually  covenanted and agreed for the benefit of all Holders of
the Securities as follows:

         Section 1. Capitalized terms used herein without  definition shall have
the meanings assigned to them in the Indenture.

         Section 2. ASC agrees,  by its  execution and delivery  hereof,  (a) to
assume  all the  rights  and  obligations  of ASC East  under  the Notes and the
Indenture, (b) that it does hereby become the primary obligor of the Notes, and,
accordingly,  may exercise every right and power of ASC East under the Indenture
with the same effect as if it had been named as the Company in the Indenture (so
that from and after the  effective  date of the Merger,  the  provisions  of the
Indenture   referring  to  the  "Company"  shall  refer  to  ASC,  as  successor
corporation, and not to ASC East), and (c) that it is bound by all the terms and
provisions of the Indenture as hereby supplemented.

         Section 3. Each  Additional  Guarantor  agrees,  by its  execution  and
delivery hereof,  that it does hereby become a Guarantor under the Indenture and
that it is bound by all the  terms and  provisions  of the  Indenture  as hereby
supplemented.  Exhibit C to the Indenture is hereby amended to read as set forth
in Annex I attached hereto.

         Section 4. The Trustee accepts this  Supplemental  Indenture and agrees
to execute the trust created by the Indenture as hereby  supplemented,  but only
upon the terms and conditions  set forth in the  Indenture,  including the terms
and provisions defining and limiting the liabilities and responsibilities of the
Trustee,  which terms and  provisions  shall in like manner define and limit its
liabilities and  responsibilities in the performance of the trust created by the
Indenture as hereby supplemented.

         Section 5. The Indenture,  supplemented as hereinabove set forth, is in
all  respects  ratified and  confirmed,  and the terms and  conditions  thereof,
supplemented  as  hereinabove  set forth,  shall be and remain in full force and
effect.

         Section 6. The recitals contained in this Supplemental  Indenture shall
be  taken as the  statements  made  solely  by ASC and the  Guarantors,  and the
Trustee shall have no liability or  responsibility  for their  correctness  and,
without  limiting the  generality  of the  foregoing,  the Trustee  shall not be
responsible in any manner  whatsoever for or with respect to (i) the validity or
sufficiency  of this  Supplemental  Indenture or any of the terms or  provisions
hereof,  (ii) the  proper  authorization  hereof  by ASC and the  Guarantors  by
corporate  action or otherwise,  (iii) the due  execution  hereof by ASC and the
Guarantors or (iv) the consequences  (direct or indirect and whether  deliberate
or inadvertent)  of any amendment  herein provided for, and the Trustee makes no
representation with respect to any such matters.

         Section 7. This Supplemental  Indenture shall become effective upon the
execution and delivery hereof by ASC, the Guarantors and the Trustee.

         SECTION  8. 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.

         Section 9. This  Supplemental  Indenture may be signed in any number of
counterparts, each of which shall be an original, with the same effect as if the
signatures thereto and hereto were upon the same instrument.






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

                                            AMERICAN SKIING COMPANY



ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President


                                    Existing Guarantors


                                    AMERICAN SKIING COMPANY RESORT
                                    PROPERTIES, INC.
ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President


                                    THE CANYONS RESORT PROPERTIES, INC.

ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President


                                    STEAMBOAT RESORT PROPERTIES, INC.

ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President









                                    HEAVENLY PROPERTIES, INC.
                                    (f/k/a Heavenly Resort Properties, Inc.)

ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President


                                    SUGARLOAF RESORT PROPERTIES, INC.


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President



                                    KILLINGTON RESORT PROPERTIES, INC.


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President



                                    MOUNT SNOW RESORT PROPERTIES, INC.


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President



                                    SUGARBUSH RESORT PROPERTIES, INC.


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President








                                    SUNDAY RIVER RESORT PROPERTIES, INC.


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President



                                    ATTITASH RESORT PROPERTIES,INC.


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President


                                    SUNDAY RIVER SKIWAY CORPORATION


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President



                                    SUNDAY RIVER, LTD.


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President



                                    PERFECT TURN, INC.

ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President




                                    L.B.O. HOLDING, INC.


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President



                                    SUNDAY RIVER TRANSPORTATION, INC.

ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President



                                    SUGARBUSH RESORT HOLDINGS, INC.


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President


                                    SUGARBUSH LEASING COMPANY


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President



                                    SUGARBUSH RESTAURANTS, INC.


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President






                                   AJT, INC. (f/k/a CI, Inc. and CRANMORE, INC.)


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President



                                    MOUNTAIN WASTEWATER TREATMENT, INC.


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President



                                    GRAND SUMMIT RESORT PROPERTIES, INC.
                                    (f/k/a LBO HOTEL CO.)

ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President



                                    S-K-I LIMITED


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President



                                    KILLINGTON LTD.


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President







                                    MOUNT SNOW LTD.


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President



                                    WVSAL, INC. (f/k/a WATERVILLE
                                    VALLEY SKI AREA, LTD.)


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President



                                    SUGARLOAF MOUNTAIN CORPORATION


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President



                                    KILLINGTON RESTAURANTS, INC.


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President



                                    DOVER RESTAURANTS, INC.


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President







                                    RESORTS TECHNOLOGIES, INC.


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President



                                    RESORT SOFTWARE SERVICES, INC.


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President



                                    MOUNTAINSIDE


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President


                                    SUGARTECH


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President



                                    PICO SKI AREA MANAGEMENT COMPANY


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President









                                    Additional Guarantors

                                    BLUNDER BAY DEVELOPMENT CO.

ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President



                                    ASC LEASING, INC.


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President




                                    ORLANDO RESORT CORPORATION

ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President


                                    ASC TRANSPORTATION, INC.


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President




                                    ASC UTAH


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President




                                    STEAMBOAT DEVELOPMENT CORPORATION

ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President




                                    STEAMBOAT SKI & RESORT CORPORATION

ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President



                                    HEAVENLY CORPORATION



ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President



                                    HEAVENLY VALLEY LIMITED PARTNERSHIP

                                    By:  HEAVENLY CORPORATION,
                                         its general partner



ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President


                                    HEAVENLY SKI & RESORT CORPORATION


ATTEST: /s/ Donna Godish             By:  /s/ Christopher E. Howard
        ------------------              -----------------------------------
                                       Name: Christopher E. Howard
                                       Title: Executive Vice President


                                    UNITED STATES TRUST COMPANY OF
                                    NEW YORK, as Trustee



ATTEST: Unable to read               By:/s/ Louis P. Young
                                       Name: Louis P. Young
                                       Title: Vice President






                                                                         Annex I

                                    EXHIBIT C

                                   GUARANTORS



1.       Sunday River Skiway Corporation
2.       Sunday River Ltd.
3.       Perfect Turn, Inc.
4.       L.B.O. Holding, Inc.
5.       Sunday River Transportation, Inc.
6.       Sugarbush Resort Holdings, Inc.
7.       Sugarbush Leasing Company
8.       Sugarbush Restaurant, Inc.
9.       AJT, Inc.
10.      S-K-I Limited
11.      Killington Ltd.
12.      Mount Snow Ltd.
13.      WVSAL, Inc.
14.      Sugarloaf Mountain Corporation
15.      Killington Restaurants, Inc.
16.      Dover Restaurants, Inc.
17.      Resorts Technologies, Inc.
18.      Resort Software Services, Inc.
19.      Mountain Wastewater Treatment, Inc.
20.      Grand Summit Resort Properties, Inc.
21.      Mountainside
22.      Sugartech
23.      Pico Ski Area Management Company
24.      American Skiing Company Resort Properties, Inc.
25.      The Canyons Resort Properties, Inc.
26.      Steamboat Resort Properties, Inc.
27.      Heavenly Properties, Inc.
28.      Sugarloaf Resort Properties, Inc.
29.      Killington Resort Properties, Inc.
30.      Mount Snow Resort Properties, Inc.
31.      Sugarbush Resort Properties, Inc.
32.      Sunday River Resort Properties, Inc.
33.      Attitash Resort Properties, Inc.
34.      Blunder Bay Development Co.
35.      ASC Leasing, Inc.
36.      Orlando Resort Corporation
37.      ASC Transportation, Inc.
38.      ASC Utah
39.      Steamboat Development Corporation
40.      Steamboat Ski & Resort Corporation
41.      Heavenly Corporation
42.      Heavenly Valley Limited Partnership
43.      Heavenly Ski & Resort Corporation