Yakima Dams Fish Passage Study

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The Phase 1 assessment process determined that there are a range of options and opportunities for providing fish passage and potentially reestablishing populations of anadromous salmonids in some tributaries of the five Yakima Project storage reservoirs. Some combinations of passage options and associated biological benefits are more feasible than others. All five reservoirs have some tributary habitat that would be available if passage were provided at the dams. However, the amount and quality of the habitat varies considerably from reservoir to reservoir. The effective passage window also varies considerably from one option to another and would significantly affect the feasibility of a given proposal.

From this initial assessment, it appears that some form of upstream and downstream passage for anadromous salmonids and bull trout connectivity is technically possible at all of the storage projects. Passage at some would be much more expensive in relation to available habitat than at other locations.

Optimizing fish passage at one storage project might require changing operations at another in order to ensure continuity of water delivery obligations and other Yakima Project purposes. For purposes of the Phase I Assessment, each project was considered separately, based on existing operational considerations and constraints.

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Phase 1 Assessment Report

Entire Document PDF 25 mb
Cover PDF 3.4 mb
Contents PDF 51 kb
Summary PDF 114 kb
River Mile Index PDF 46 kb
1. Introduction PDF 123 kb
2. Current Project Operations PDF 153 kb
3. Storage Facilities, Operations, and Descriptions PDF 107 kb
4. Fisheries and Fish Passage Considerations PDF 126 kb
5. Tributary Habitat Conditions PDF 128 kb
6. Passage Concepts PDF 135 kb
7. Upstream and Downstream Fish Passage Options by Dam PDF 123 kb
8. Integrating Biological, Engineering, & Operational Considerations PDF 100 kb
9. Conclusions and Recommendations PDF 92 kb
10. References PDF 101 kb
11. Participants PDF 99 kb
12. Glossary, Acronyms, Abbreviations PDF 119 kb

Appendices
Cover and Contents PDF 45 kb
Appendix A PDF 932 kb
Appendix B PDF 310 kb
Appendix C PDF 147 kb
Appendix D Cover and Contents PDF 50 kb
Appendix D Figures 1-6 PDF 7.9 mb
Appendix D Drawings 1-5 PDF 7.9 mb
Appendix D Drawings 6-10 PDF 7.2 mb
Appendix D Drawings 11-15 PDF 4.2 mb
Appendix D Drawings 16-20 PDF 3.1 mb
Appendix D Drawings 21-23 PDF 10 mb
Appendix E PDF 31 kb

Ellen Berggren, Activity Manager
Bureau of Reclamation
1150 N Curtis Road, Suite 100
Boise, ID 83706

eberggren@pn.usbr.gov
(208) 378-5090
(208) 378-5102 FAX