The U.S. Army Corps of Engineers, Bureau of Reclamation, and Bonneville Power Administration, as co-lead agencies, developed the EIS in response to the need to review and update management of the Columbia River System, which is comprised of 14 Federal dam and reservoir projects in Idaho, Montana, Oregon, and Washington.  The EIS, developed in accordance with the National Environmental Policy Act, documents the review of potential actions and discloses the environmental effects of taking those actions, including evaluating impacts to resources in the context of new information and changed conditions in the Columbia River basin and in response to a court order by the U.S. District Court for the District of Oregon.


The Record of Decision was issued September 28, 2020.


Notice of Intent published on September 30, 2016
Public scoping period:  September 30, 2016 – February 7, 2017
Scoping public meetings: October – January 2017
Draft EIS released for public comment on February 28, 2020
Draft EIS public comment period:  February 28, 2020 – April 13, 2020
Draft EIS public hearings:  March 17, 2020 – March 31, 2020
Final EIS July 31, 2020
Record of Decision issued September 28, 2020


For more information, please visit the project website at 

You may also contact by mail, email, or telephone:
Bonneville's Public Information Center
P.O. Box 3621
Portland, Oregon 97208-3621

or at 

or by telephone at 1800 - 622 - 4519


Supplement Analysis 03  (10/31/2022)
Supplement Analysis 02  (08/04/2022)
Supplement Analysis 01  (10/20/2021)

Federal Register Notice  (10/08/2020)
Record of Decision  (09/28/2020)

Notice of Availability  (07/31/2020)
Executive Summary
Chapters 1 & 2
Chapter 3
Chapters 4 - 13
Appendices A & B
Appendix C
Appendix D
Appendix E
Appendices F - S
Appendix T
Appendix U
Appendix V part 1
Appendix V part 2
Appendix V part 3
Appendix W - X

Notice of Availability  (02/28/2020)
Chapters 1 & 2
Chapter 3
Chapters 4 - 13
Appendices A & B
Appendix C
Appendix D
Appendices E - O
Appendices P - U
Appendix V

Notice to Extend Public Comment Period  (01/03/2017)
Notice of Intent  (09/30/2016)