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Brian Burke, Kinsey Frick Northwest Fisheries Science Center, NOAA Fisheries, Seattle

Evaluation of adult salmon passage behavior in relation to fishway modifications at The Dalles and John Day Dams. Brian Burke, Kinsey Frick Northwest Fisheries Science Center, NOAA Fisheries, Seattle

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Brian Burke, Kinsey Frick Northwest Fisheries Science Center, NOAA Fisheries, Seattle

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  1. Evaluation of adult salmon passage behavior in relation to fishway modifications at The Dalles and John Day Dams Brian Burke, Kinsey Frick Northwest Fisheries Science Center, NOAA Fisheries, Seattle Christopher Caudill, Eric Johnson, Tami Clabough, Mike Jepson, Matt Keefer, Steve Lee, Jeff Garnett, Les Layng, Travis Dick Department of Fish and Wildlife Sciences, University of Idaho, Moscow

  2. Outline • The Dalles Dam • Ladder use • Side switching • John Day Dam • Entrance efficiency and time

  3. F1 E1 A1 Are fish avoiding the North ladder? If so, is this related to spill, fish size, etc.?

  4. Fork Length Distribution

  5. Logistic Regression North Ladder East Ladder

  6. Probability of Using the North Shore/Ladder F1 A1 E1

  7. Probability of Using the North Shore/Ladder A1 for Chinook A1 for Sockeye

  8. (816) (790) (907) (965) (888) (1072) (445) (462) (528) (410) (480) (254) (353) 2013

  9. Side Switching 1TD N = 603 2TD N = 249 Logistic Regression

  10. Probability of Switching Sides Between F1 and E1

  11. Travel time from F1 to A1

  12. Entrance Efficiency North Ladder East Ladder 48 11 21 455 245 325

  13. John Day Dam

  14. Summary • The Dalles • Most Chinook use the south side of the river (downstream of The Dalles Dam) • Larger fish use the North side more than small fish • All are less likely to approach the North with higher spill • Fish switch sides – influenced by spill (jacks) • Approaching the North does not cause significant delays • John Day • Entrance efficiency and entrance time look good (may have improved?)

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