2002 Lower Snake Dam Feasibility Report

Walla Walla District USACE Website

Lower Snake River Juvenile Salmon Migration Feasibility Study

This contains the Final Feasibility Report/Environmental Impact Statement (Final FR/EIS), Executive Summary, and 21 Technical Appendices for the Lower Snake River Juvenile Salmon Migration Feasibility Study. All files are provided in PDF format and can be read using Adobe Acrobat Reader.

The U.S. Army Corps of Engineers spent seven years studying Snake River dam removal. The final environmental impact statement, released in 2002, evaluated four alternatives to help lower Snake River fall chinook get past the dams: 1) the existing condition; 2) maximum transport of juvenile salmon; 3) system improvements that could be accomplished without a drawdown and 4) dam breaching.

The study included engineering work; biological investigations (i.e., effects to salmon and steelhead, resident fish, and wildlife); effects on recreation, cultural resources, and water quality; and socioeconomic effects, including implementation costs, navigation, irrigation, and power. The development of an environmental impact statement and public involvement were also included in the study, both of which are essential to the National Environmental Policy Act process.

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Final Feasibility Report and Environmental Impact Statement

SUMMARY Improving Salmon Passage
Front Matter Abstract, Table of Contents, Acronyms and Abbreviations
Executive Summary Executive Summary
Section 1 Introduction
Section 2 Affected Projects and Programs
Section 3 Plan Formulation
Section 4 Affected Environment
Section 5 Environmental Effects of Alternatives
Section 6 Plan Selection and Implementation
Section 7 Regional Coordination and Public Outreach
Section 8 Compliance with Applicable Federal Environmental Statutes and Regulations
Section 9 Literature Cited
Section 10 Glossary
Section 11 List of Preparers
Section 12 Distribution List
Section 13 Index
Appendix A Anadromous Fish Modeling
Appendix B Resident FishÂ
Appendix C Water Quality
Appendix D Natural River Drawdown Engineering
Annex A Turbine Passage Modification Plan
Annex B Dam Embankment Excavation Plan
Annex C Temporary Fish Passage Plan
Annex D River Channelization Plan
Annex E Bridge Pier Protection Plan
Annex F Railroad and Highway Embankment Protection Plan
Annex G Drainage Structures Protection Plan
Annex H Railroad and Roadway Damage Repair Plan
Annex I Lyons Ferry Hatchery Modification Plan
Annex J Habitat Management Units Modification Plan
Annex K Reservoir Revegetation Plan
Annex L Cattle Watering Facilities Management Plan
Annex M Recreation Access Modification Plan
Annex N Cultural Resources Protection Plan
Annex O Irrigation Systems Modification Plan
Annex P Water Well Modification Plan
Annex Q Potlatch Corporation Water Intake Modification Plan
Annex R Other River Structures Modification Plan
Annex S Potlatch Corporation Effluent Diffuser Modification Plan
Annex T PG&E Gas Transmission Main Crossings Modification Plan
Annex U Hydropower Facilities Decommissioning Plan
Annex V Concrete Structures Removal Plan
Annex W Implementation Schedule
Annex X Comprehensive Baseline Cost Estimate
Appendix E Existing Systems and Major System Improvements Engineering
Appendix F Hydrology/Hydraulics and Sedimentation
Appendix G Hydroregulations
Appendix H Fluvial Geomorphology
Appendix I Economics
Appendix J Plan Formulation
Appendix K Real Estate
Appendix L Lower Snake River Mitigation History and Status
Appendix M Fish and Wildlife Coordination Act Report
Appendix N Cultural Resources
Appendix O Public Outreach Program
Appendix P Air Quality
Appendix Q Tribal Consultation and Coordination
Appendix R Historical Perspectives
Appendix S Snake River Maps
Annex A 1934 Survey Drawings:
Drawings 1-11 Sheet Numbers 1 Through 11
Drawings 12-23 Sheet Numbers 12 Through 23
Drawings 24-35 Sheet Numbers 24 Through 35
Drawings 36-47 Sheet Numbers 36 Through 47
Drawings 48-59 Sheet Numbers 48 Through 59
Drawings 60-71 Sheet Numbers 60 Through 71
Drawings 72-83 Sheet Numbers 72 Through 83
Drawings 84-95 Sheet Numbers 84 Through 95
Drawings 96-107 Sheet Numbers 96 Through 107
Drawings 108-119 Sheet Numbers 108 Through 119
Drawings 120-131 Sheet Numbers 120 Through 131
Annex B Pre- and Post-Dam Comparison Displays
Appendix T Clean Water Act, Section 404(b)(1) Evaluation
Appendix U Response to Public Comments


Drawdown Regional Economic Workgroup (DREW) Products

The potential economic effects of actions related to the lower Snake River have been analyzed by numerous entities throughout the region. To reduce conflicting analyses and pool resources for a more efficient effort, the Corps convened the Drawdown Regional Economic Workgroup (DREW). The purpose of DREW is to develop a combined regional economic analysis. Members of DREW include the Corps, Bonneville Power Administration (BPA), Bureau of Reclamation (BoR), National Marine Fisheries Service (NMFS), Northwest Power Planning Council (NPPC), the Columbia River Inter-Tribal Fish Commission (CRITFC), and representatives of other interested groups. The DREW meetings, held in various locations throughout the region, on roughly a bi-monthly basis, were regularly advertised and open to the public. Members of the public and representatives of various interest groups regularly participated in and contributed to these meetings.

Drawdown Regional Economic Workgroup (DREW) Products

Power System Analysis

  • Technical Report on Hydropower Costs and Benefits – 31 March 1999 – Final Report – PDF Version
  • Power System Analysis – July 1999 – PDF Version

Recreation and Tourism Analysis

  • Recreation and Tourism Analysis – April 1999 – PDF Version
  • Recreation Use and NED Benefits Technical Chapter – October 1999 – PDF Version

Transportation Analysis

  • Technical Report – Transportation – 14 October 1999 – PDF Version
  • Technical Exhibit A – Survey of Snake River Grain Facilities – Jack Faucett Associates, Inc. – September 1998 – PDF Version
  • Technical Exhibit B – The National and Regional Economic Benefits of Commercial Navigation on the Snake River – The Tennessee Valley Authority and The Center for Business and Economic Research, Lewis College of Business – June 1998 – PDF Version
  • Technical Exhibit C – Transportation Study – Implication of Changes in the Columbia-Snake River System Waterway on Grain Logistics from the Traditional Portland Market Gathering Territory – Upper Great Plains Transportation Institute, Fargo, North Dakota – August 1999 – PDF Version
  • Technical Exhibit D – Assumptions, Input Values and Example Reebie Modal Cost Estimates for Barge, Rail and Truck Transport – PDF Version
  • Technical Exhibit F – The Incremental Cost of Transportation Capacity in Freight Railroading: An Application to the Snake River Basin – The Tennessee Valley Authority and the Center for Business and Economic Research, Lewis College of Business – July 1998 – PDF Version
  • Transportation Analysis – October 1999 – PDF Version

Water Supply Analysis

  • Water Supply Analysis – November 1999 – PDF Version

Anadromous Fish Economic (Commercial) Analysis

  • Economic Impacts and Values for Changed Anadromous Fish Harvests Due to Lower Snake River Hydrosystem Management Actions and the Economic Impacts and Values for Anadromous Fish Harvests from the Columbia River Basin – October 1999 – PDF Version
    • Appendix 2.A, Anadromous Fish Size, Price, and Per Unit Economic Assumptions – PDF Version
    • Appendix 3.A, Snake River Anadromous Fish Run Size and Harvest Forecasts – PDF Version
    • Appendix 4.A, Hatchery Origin and Wild Origin Smolt Production – PDF Version
  • Anadromous Fish Economic Analysis – October 1999 – PDF Version

Implementation/Avoided Costs Analysis

  • Implementation/Avoided Costs – November 1999 – PDF Version

Passive Use Analysis

  • Passive Use Values of Wild Salmon and Free-Flowing Rivers – October 1999 – PDF Version

Tribal Circumstances and Perspectives Analysis

  • Tribal Circumstances and Perspectives Analysis of Impacts of the Lower Snake River Project on the Nez Perce, Yakima, Warm Springs, and Shoshone-Bannock Tribes – September 1999 – PDF Version
  • Tribal Circumstances and Perspectives Analysis – September 1999 – PDF Version

Regional Economic Analysis

Social Analysis

  • Social Analysis Report – June 1999 – PDF Version
  • Social Impact Analysis – October 1999 – PDF Version

Risk and Uncertainty Analysis

  • Risk and Uncertainty Assessment – December 1999 – PDF Version

Cost Effectiveness Analysis

  • Cost Effectiveness – November 1999 – PDF Version

Summary of Effects

  • Summary of Effects – December 1999 – PDF Version

Cost Allocation

Financial Analysis

  • Financial Analysis – December 1999 – PDF Version

Compensatory Actions

  • Compensatory Actions – November 1999 – PDF Version