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Northwest Power and Conservation Council Science Policy Exchange September 12, 2007

Direct Survival of Migrating Salmonid Smolts in the Snake and Lower Columbia Rivers: Update with 2007 Results. Northwest Power and Conservation Council Science Policy Exchange September 12, 2007 Steve Smith steven.g.smith@noaa.gov John Williams john.g.williams@noaa.gov

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Northwest Power and Conservation Council Science Policy Exchange September 12, 2007

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  1. Direct Survival of Migrating Salmonid Smolts in the Snake and Lower Columbia Rivers: Update with 2007 Results Northwest Power and Conservation Council Science Policy Exchange September 12, 2007 Steve Smith steven.g.smith@noaa.gov John Williams john.g.williams@noaa.gov Bill Muir bill.muir@noaa.gov

  2. Outline • Juvenile survival and travel time through the hydropower system • Update with preliminary 2007 results • Annual summer “survival memo” released 31 August 2007

  3. Outline • SARs for Snake River spring-summer Chinook • Difference in SARs between PIT-tagged and untagged fish • Relationship between direct juvenile survival and SARs

  4. Survival and Travel Time for PIT-tagged Spring Migrants

  5. Juvenile detectors Chief Joseph Wells GrandCoulee Rocky Reach Rock Island Wanapum Ice Harbor Priest Rapids Lower Granite Little Goose Lower Monumental McNary John Day Bonneville The Dalles Hells Canyon Oxbow Brownlee Snake R. trap

  6. Many fish are transported Preliminary COMPASS estimates for 2007: • 46% of non-tagged stream type Chinook • 67% of non-tagged steelhead

  7. 82.0(90.6) 92.2 87.7 95.6 93.7 94.3 BON JDA MCN LMO LGO LGR SRT 81.4 (90.0) 85.1 85.5 90.3 92.4 93.2 Stream-type Chinook salmon reach survival LGR LGO LMO 93.0 SRT 96.0 ICE BON JDA TDA MCN

  8. 61.4(78.4) 94.7 84.8 91.3 88.6 100.0 BON JDA MCN LMO LGO LGR SRT 72.4 (84.9) 74.6 73.1 88.7 90.5 94.2 Steelhead reach survival LGR LGO LMO 90.1 SRT 95.4 ICE BON JDA TDA MCN

  9. Smolt-to-Adult Return (SAR) for Spring Migrants

  10. Questions

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