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ESA-listed Snake River Salmon: What’s the link to Snake River dams?

ESA-listed Snake River Salmon: What’s the link to Snake River dams?. Conference on Large Scale Water Infrastructure: GLOBAL PERSPECTIVES ON LARGE DAMS 3-5 November 2006 - New Haven, Connecticut, USA. John G. Williams NOAA Northwest Fisheries Science Center Seattle

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ESA-listed Snake River Salmon: What’s the link to Snake River dams?

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  1. ESA-listed Snake River Salmon: What’s the link to Snake River dams? Conference on Large Scale Water Infrastructure: GLOBAL PERSPECTIVES ON LARGE DAMS 3-5 November 2006 - New Haven, Connecticut, USA John G. Williams NOAA Northwest Fisheries Science Center Seattle john.g.williams@noaa.gov

  2. Poll

  3. Snake River dams or salmon Can we have both?

  4. Decision makers need to know --- Is dam removal necessary?

  5. Decision makers need to know --- Is dam removal necessary? Is dam removal sufficient?

  6. Road Map • Salmon stocks pre- and post • dam construction • Direct dam impacts • Modifications to dams • Where are we now? • Can we answer the questions?

  7. No data

  8. Changes to the hydropower system

  9. Improvements or installation of juvenile bypass systems at dams

  10. Transportation by barge

  11. Changes in water storage

  12. Changes in turbine operations

  13. Spill designated for fish

  14. Columbia River salmon ESUs (13 of 17 listed under the U.S. Endangered Species Act) Snake River – Sockeye Salmon - Sockeye Salmon Chinook salmon - spring-summer run; fall-run Steelhead - Steelhead Columbia River – Sockeye Salmon - Lake Wenatchee/Okanogan River Chinook salmon - Upper spring-run, Upper summer-fall run, Middle spring-run, Deschutes River summer-fall run, Lower Steelhead - Upper, Middle, and Lower Coho salmon - Lower Chum salmon - Lower Upper Willamette River - Chinook salmon; Steelhead

  15. Other significant changes

  16. Context Stocks naturally fluctuate

  17. Baumgartner et al. 1992 CalCofi

  18. Schindler et al. 2006 CJFAS

  19. In 1811 and in the late 1820s the middle Columbia River (between the confluence of the Snake River and Kettle Falls) had salmon populations so low that settlers and Native Americans relied on horseflesh for survival Chance (1973) - information from early pioneer diaries:

  20. R2=0.71 Scheuerell and Williams 2005 Fisheries Oceanography

  21. Do dams effect fish?

  22. Do dams effect fish? Could we harvest adults at higher rates without dams?

  23. Do dams effect fish? Could we harvest adults at higher rates without dams? Is recovery limited by dams?

  24. If the evidence was clear, the debate would not rage

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