SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                   FORM 10-K/A

                  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

   FOR FISCAL YEAR ENDED DECEMBER 31, 2004     COMMISSION FILE NUMBER 0-11688

                          AMERICAN ECOLOGY CORPORATION
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

                 DELAWARE                              95-3889638
     (STATE OR OTHER JURISDICTION OF               (I.R.S. EMPLOYER
      INCORPORATION OR ORGANIZATION)               IDENTIFICATION NO.)

     300 E. MALLARD, SUITE 300, BOISE, IDAHO                 83706
     (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)             (ZIP CODE)

  REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE:         (208) 331-8400

           SECURITIES REGISTERED PURSUANT TO SECTION 12(B) OF THE ACT:

                                      NONE

           SECURITIES REGISTERED PURSUANT TO SECTION 12(G) OF THE ACT:
                     Common Stock, $.01 par value per share
                                (Title of Class)

Indicate by check mark whether the Registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding  12  months  (or  for such shorter period that the Registrant was
required  to  file  such  reports),  and  (2)  has  been  subject to such filing
requirements  for  the  past  90  days.
                               Yes  [X]    No  [_]

Indicate  by  check mark if disclosure of delinquent filers pursuant to Item 405
of  Regulation  S-K  is  not contained herein, and will not be contained, to the
best  of  Registrant's  knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form  10-K.  [_].

Indicate  by  check  mark  whether  the  registrant  is an accelerated filer (as
defined  in  Rule  12b-2  of  the  Act).
                              Yes  [X]     No  [_]

The  aggregate  market  value  of  the  Registrant's  voting  stock  held  by
non-affiliates  on  June  30,  2004  was approximately $134,800,000 based on the
closing price of $11.98 per share as reported on the NASDAQ Stock Market, Inc.'s
National  Market  System.

At March 1, 2005, Registrant had outstanding 17,411,294 shares of its Common
Stock.

                       Documents Incorporated by Reference
Portions of the Proxy Statement for the Annual Meeting of Stockholders to be
held May 25, 2005.       Part III


                                        1

EXPLANATORY  NOTE

This  Amendment  No.  1 to American Ecology Corporation's Form 10-K for the year
ended  December  31,  2004  is being filed to report the results of Management's
Assessment  of  Internal Control over Financial Reporting as well as the results
of  the  Company's  Independent  Registered  Public  Accounting  Firm's audit of
Internal  Controls  over  Financial  Reporting.


                                        2

                                TABLE OF CONTENTS

                                     PART II
Item     9A.     Controls and Procedures. . . . . . . . . . . . . . . . . . 

                                     PART IV
Item     15.     Exhibits, Financial Statement Schedules. . . . . . . . . . 


                                        3

ITEM 9A.   CONTROLS AND PROCEDURES

As  of  the  end  of  the  quarter  prior  to the filing of this report, Company
management,  under  the  direction  of  the  Chief  Executive  Officer and Chief
Financial  Officer, carried out an evaluation of the effectiveness of the design
and  operation  of  the Company's disclosure controls and procedures pursuant to
Rule  13a-14  of the Securities Exchange Act of 1934 (Exchange Act).  Based upon
that evaluation, the Chief Executive Officer and Chief Financial Officer believe
that  the Company's disclosure controls and procedures are effective in alerting
them  timely  to  material information required to be disclosed in the Company's
Exchange  Act  filings.

During  the  year  ending  December  31,  2004,  there  were improvements to the
Company's  systems  used to record and summarize transactions.  The improvements
have  enabled  the Company to identify and modify internal controls, operational
procedures  and  environmental  compliance  programs.

MANAGEMENT'S ANNUAL REPORT ON INTERNAL CONTROLS OVER FINANCIAL REPORTING.
Management  is  responsible for and maintains a system of internal controls over
financial  reporting  that  is designed to provide reasonable assurance that its
records  and  filings accurately reflect the transactions engaged in Section 404
of  Sarbanes-Oxley  Act  of  2002 and related rules issued by the Securities and
Exchange  Commission require managementto issue a report onits internal controls
over  financial  reporting.

Management  has  conducted  an assessment of its internal controlsover financial
reporting  utilizing  the  criteria  set  forth  by  the Committee of Sponsoring
Organizations  ("COSO")  of  the  Treadway  Commission  in  Internal  Control  -
Integrated  Framework  and concluded that, as of December 31, 2004, the internal
controls  over  financial  reporting  were  operating  effectively.

The Company's independent registered public accounting firm, Moss Adams LLP, has
audited  management's  assessment  of the effectiveness of internal control over
financial  reporting  and  has  expressed  unqualified  opinions on management's
assessment  and  on  the  effectiveness  of  the Company's internal control over
financial  reporting  as  of  December  31,  2004.

While both Management and the Company's independent registered public accounting
firm have concluded that the Company's internal control over financial reporting
were  effective  at  December  31,  2004,  there  were  two areas, one involving
revenue,  and  one  involving  financial  reporting, that were identified by the
Company's  independent  registered  public  accounting  firm  as  containing
"significant  deficiencies,"  as  defined by Public Company Accounting Oversight
Board  Auditing  Standard  No.  2  ("AS  2).  As required by AS 2, the Company's
independent  registered  public  accounting  firm  reported  these  significant
deficiencies  to  the  Company's  Audit  Committee.

             REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To  the  Shareholders  and  Board  of  Directors
American  Ecology  Corporation

We  have  audited  management's  assessment,  included  in  the  accompanying
Management's  Report  on Internal Control over Financial Reporting that American
Ecology  Corporation  maintained  effective  internal  control  over  financial
reporting  as of December 31, 2004, based on criteria set forth by the Committee
of  Sponsoring  Organizations  of  the  Treadway  Commission  (COSO) in Internal
Control  -  Integrated  Framework.  American Ecology Corporation's management is
responsible  for maintaining effective internal control over financial reporting
and  for  its assessment of the effectiveness of internal control over financial
reporting.  Our  responsibility  is  to  express  an  opinion  on  management's
assessment and an opinion on the effectiveness of the company's internal control
over  financial  reporting  based  on  our  audit.

We  conducted  our  audit in accordance with the standards of the Public Company
Accounting Oversight Board (United States). Those standards require that we plan
and  perform  the  audit  to obtain reasonable assurance about whether effective
internal  control  over  financial  reporting  was  maintained  in  all material
respects. Our audit included obtaining an understanding of internal control over
financial  reporting, evaluating management's assessment, testing and evaluating
the  design and operating effectiveness of internal control, and performing such
other  procedures  as  we  considered necessary in the circumstances. We believe
that  our  audit  provides  a  reasonable  basis  for  our  opinion.


                                        4

A  company's  internal control over financial reporting is a process designed to
provide  reasonable  assurance  regarding the reliability of financial reporting
and  the preparation of financial statements for external purposes in accordance
with  accounting  principles generally accepted in the United States of America.
A  company's  internal  control over financial reporting includes those policies
and  procedures  that  (1)  pertain  to  the  maintenance  of  records  that, in
reasonable  detail,  accurately  and  fairly  reflect  the  transactions  and
dispositions of the assets of the company; (2) provide reasonable assurance that
transactions  are  recorded  as  necessary  to  permit  preparation of financial
statements in accordance with generally accepted accounting principles, and that
receipts  and expenditures of the company are being made only in accordance with
authorizations  of  management  and  directors  of  the company; and (3) provide
reasonable  assurance  regarding  prevention or timely detection of unauthorized
acquisition,  use,  or  disposition  of  the  company's assets that could have a
material  effect  on  the  financial  statements.

Because  of  its inherent limitations, internal control over financial reporting
may  not prevent or detect misstatements. Also, projections of any evaluation of
effectiveness to future periods are subject to the risk that controls may become
inadequate  because  of  changes in conditions, or that the degree of compliance
with  the  policies  or  procedures  may  deteriorate.

In  our  opinion,  management's  assessment  that  American  Ecology Corporation
maintained  effective  internal  control over financial reporting as of December
31,  2004,  is  fairly  stated,  in all material respects, based on criteria set
forth  by  the  Committee of Sponsoring Organizations of the Treadway Commission
(COSO)  in  Internal  Control  -  Integrated  Framework.  Also  in  our opinion,
American  Ecology  Corporation  maintained,  in all material respects, effective
internal  control  over  financial  reporting  as of December 31, 2004, based on
criteria  set forth by the Committee of Sponsoring Organizations of the Treadway
Commission  (COSO)  in  Internal  Control  -  Integrated  Framework.

We  have  also  audited,  in accordance with the standards of the Public Company
Accounting  Oversight  Board  (United  States),  the  consolidated  financial
statements of American Ecology Corporation as of and for the year ended December
31, 2004, and our report dated January 28, 2005 expressed an unqualified opinion
on  those  financial  statements  and  financial  statement  schedule.



Moss  Adams  LLP
Los  Angeles,  California
April  15,  2005


                                        5

                                     PART IV

ITEM 15.     EXHIBITS, FINANCIAL STATEMENT SCHEDULES

             1.  Financial statements and reports of Independent Auditors
                       Independent Auditors' Reports
                       Consolidated Balance Sheets - December 31, 2004 and
                            2003
                       Consolidated Statements of Operations for the years
                            ended December 31, 2004, 2003 and 2002
                       Consolidated Statements of Shareholders' Equity for the
                            years ended December 31, 2004, 2003 and 2002
                       Consolidated Statements of Cash Flows for the years
                            ended December 31, 2004, 2003, and 2002
                       Notes to Consolidated Financial Statements

             2.  Financial statement schedules
                       Other schedules are omitted because they are not
                       required or because the information is included in the
                       financial statements or notes thereto

             3.  Exhibits



------------------------------------------------------------------------------------------------------------------------
Exhibit                          Description                                          Incorporated by Reference from
  No.                                                                                          Registrant's
-------  ------------------------------------------------------------------------  -------------------------------------
                                                                             
    3.1  Restated Certificate of Incorporation, as amended                         1989 Form 10-K
-------  ------------------------------------------------------------------------  -------------------------------------
    3.2  Certificate of Amendment to Restated Certificate of Incorporation dated   Form S-4 dated 12-24-92
         June 4, 1992
-------  ------------------------------------------------------------------------  -------------------------------------
    3.3  Amended and Restated Bylaws dated February 28, 1995                       1994 Form 10-K
-------  ------------------------------------------------------------------------  -------------------------------------
   10.1  Sublease dated February 26, 1976, between the State of Washington, the    Form 10 filed 3-8-84
         United States Dept. of Commerce and Economic Development, and
         Nuclear Engineering Company with Amendments dated January 11,
         1980, and January 14, 1982.
-------  ------------------------------------------------------------------------  -------------------------------------
   10.2  Lease Agreement as amended between American Ecology Corporation           2002 Form 10-K
         and the State of Nevada
-------  ------------------------------------------------------------------------  -------------------------------------
   10.6  State of Washington Radioactive Materials License issued to US            1986 Form 10-K
         Ecology, Inc. dated January 21, 1987
-------  ------------------------------------------------------------------------  -------------------------------------
  10.11  Agreement between the Central Interstate Low-Level Radioactive            2nd Quarter 1988 10-Q
         Waste Compact Commission and US Ecology, Inc. for the development
         of a facility for the disposal of low-level radioactive waste dated
         January 28, 1988 ("Central Interstate Compact Agreement")
-------  ------------------------------------------------------------------------  -------------------------------------
  10.12  Amendment to Central Interstate Compact Agreement May 1, 1990             1994 Form 10-K
-------  ------------------------------------------------------------------------  -------------------------------------
  10.13  Second Amendment to Central Interstate Compact Agreement dated            1994 Form 10-K
         June 24, 1991
-------  ------------------------------------------------------------------------  -------------------------------------
  10.14  Third Amendment to Central Interstate Compact Agreement dated July        1994 Form 10-K
         1, 1994
-------  ------------------------------------------------------------------------  -------------------------------------
  10.18  Memorandum of Understanding between American Ecology                      1989 Form 10-K
         Corporation and the State of California dated August 15, 1988
-------  ------------------------------------------------------------------------  -------------------------------------
  10.35  Lease Agreement for Corporate Office Space between American               2nd Qtr 2002 Form 10-Q filed 8-14-02
         Ecology Corporation and M&S Prime Properties dated April 18, 2002
-------  ------------------------------------------------------------------------  -------------------------------------
 10.50a  First Security Bank Credit Agreement                                      3rd Qtr 2000 Form 10-Q filed 11-13-00
-------  ------------------------------------------------------------------------  -------------------------------------
 10.50c  Term Loan Agreement between American Ecology Corporation and              Form 8-K filed 10-25-02
         Wells Fargo Bank dated October 22, 2002
-------  ------------------------------------------------------------------------  -------------------------------------
 10.50d  Sixth Amendment to Credit Agreement between American Ecology              Form 8-K filed 12-16-03
         Corporation and Wells Fargo Bank dated December 16, 2003
-------  ------------------------------------------------------------------------  -------------------------------------


                                        6

------------------------------------------------------------------------------------------------------------------------
 10.50e  Seventh Amendment to Credit Agreement between American Ecology            Form 8-K filed 8-31-04
         Corporation and Wells Fargo Bank dated August 30, 2004
-------  ------------------------------------------------------------------------  -------------------------------------
 10.50f  First Amendment to Term Loan Agreement between American Ecology           Form 8-K filed 8-31-04
         Corporation and Wells Fargo Bank dated August 30, 2004
-------  ------------------------------------------------------------------------  -------------------------------------
 10.50g  Eighth Amendment to Credit Agreement between American Ecology             Form 8-K filed 12-16-04
         Corporation and Wells Fargo Bank dated December 16, 2004
-------  ------------------------------------------------------------------------  -------------------------------------
  10.52  *Amended and Restated American Ecology Corporation 1992 Director          Proxy Statement dated 3-28-01
         Stock Option Plan
-------  ------------------------------------------------------------------------  -------------------------------------
  10.53  *Amended and Restated American Ecology Corporation 1992                   Proxy Statement dated 4-16-03
         Employee Stock Option Plan
-------  ------------------------------------------------------------------------  -------------------------------------
  10.55  *Management Incentive Plan Effective January 1, 2003                      2002 Form 10-K
-------  ------------------------------------------------------------------------  -------------------------------------
  10.56  *Form of Management Incentive Plan Participation Agreement Dated          2002 Form 10-K
         February 11, 2003
-------  ------------------------------------------------------------------------  -------------------------------------
  10.57  *Form of Executive Employment Agreement Dated February 11, 2003           2002 Form 10-K
-------  ------------------------------------------------------------------------  -------------------------------------
  10.58  *Form of Stock Option Agreement Dated February 11, 2003                   2002 Form 10-K
-------  ------------------------------------------------------------------------  -------------------------------------
  10.70  Form of Royalty Agreement for El Centro Landfill Dated February 13,       Form 8-K filed 2-13-03
         2003
-------  ------------------------------------------------------------------------  -------------------------------------
   14.1  Code of Ethics for Chief Executive and Senior Financial Officers          Proxy Statement dated 4-2-04
-------  ------------------------------------------------------------------------  -------------------------------------
   14.2  Code of Ethics for Directors                                              2004 Form 10-K
-------  ------------------------------------------------------------------------  -------------------------------------
     21  List of Subsidiaries                                                      2004 Form 10-K
-------  ------------------------------------------------------------------------  -------------------------------------
   23.1  Consent of Moss Adams LLP
-------  ------------------------------------------------------------------------  -------------------------------------
   31.1  Certifications of December 31, 2003 Form 10-K by Chief Executive
         Officer dated March 1, 2005
-------  ------------------------------------------------------------------------  -------------------------------------
   31.2  Certifications of December 31, 2003 Form 10-K by Chief Financial
         Officer dated March 1, 2005
-------  ------------------------------------------------------------------------  -------------------------------------
   32.1  Certifications of December 31, 2003 Form 10-K by Chief Executive
         Officer dated March 1, 2005
-------  ------------------------------------------------------------------------  -------------------------------------
   32.2  Certifications of December 31, 2003 Form 10-K by Chief Financial
         Officer dated March 1, 2005
------------------------------------------------------------------------------------------------------------------------


*Management contract or compensatory plan.


                                        7

SIGNATURES

     Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, Registrant has duly caused this annual report to be signed
on its behalf by the undersigned, thereunto duly authorized.


                          AMERICAN ECOLOGY CORPORATION




SIGNATURE                 TITLE                                   DATE
---------                 -----                                   ----

/s/ James R. Baumgardner  Senior Vice President, Chief Financial  April 22, 2005
------------------------  Officer, Treasurer and Secretary        --------------
JAMES R. BAUMGARDNER


                                        8