ESA-listed Snake River Salmon: What’s the link to Snake River dams? John G. Williams NOAA Northwest Fisheries Science Center Seattle

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Presentation transcript:

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

Poll

Snake River dams or salmon Can we have both?

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

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

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

No data

Changes to the hydropower system

Improvements or installation of juvenile bypass systems at dams

Transportation by barge

Changes in water storage

Changes in turbine operations

Spill designated for fish

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

Other significant changes

Context Stocks naturally fluctuate

Baumgartner et al CalCofi

Schindler et al CJFAS

Chance (1973) - information from early pioneer diaries: 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

Scheuerell and Williams 2005 Fisheries Oceanography R 2 =0.71

Do dams effect fish?

Could we harvest adults at higher rates without dams?

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

If the evidence was clear, the debate would not rage