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Roza Reach Smolt Survival Study 2012-2014

This study investigates smolt survival between Roza Dam and Naches-Yakima River confluence, assessing flow effects and passage mortality. Analyzing data collected since 2012, the research aims to address competing hypotheses and quantify the impact of environmental factors on smolt survival rates.

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Roza Reach Smolt Survival Study 2012-2014

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  1. Cramer Fish Sciences Tommy Garrison Ian Courter U.S. Geological Survey Tobias Kock Russell Perry Roza Reach Smolt Survival Study 2012-2014 Photo Credit David Child

  2. Funding and Collaboration Funding provided by: U.S. Bureau of Reclamation Yakima Basin Joint Board U.S. Bureau of Reclamation Joel Hubble Quentin Kreuter Jeff Sullivan Ron Moores Chris Lynch Jason Hennessey Systems Operations Advisory Committee David Child, JB John Easterbrooks, WDFW Mark Johnston, YN Jeff Thomas, USFWS Yakama Nation Fisheries Mark Johnston Joe Hoptowit Ray Decoteau Antoine Marek National Marine Fisheries Service Sean Gross Dale Bambrick US Fish and Wildlife Service Pat Monk Jeff Thomas Yakima Basin Joint Board David Child

  3. Competing Hypotheses • Low flows are causing abnormally high mortality between Roza Dam and the Naches-Yakima River confluence (“Roza Reach”). • Low mortality in the Roza Reach due to short residence time of emigrating smolts.

  4. Study Objectives • Quantify flow effects on smolt survival in the Roza Reach. • Partition effects of Roza Dam passage mortality from migration survival estimates.

  5. Progress Since 2014 Science Conf. • Comprehensive analysis of flow-survival for the entire length of the Yakima River. • Detailed evaluation of passage survival conditions at Roza Dam.

  6. 6 points of detection • 12 upstream release groups 2012-14 • 5 Roza tailrace release groups • 50-130 yearling Chinook/release group • Prescribed flow treatments Richland

  7. Treatment Groups Low Moderate High

  8. Travel Time

  9. Median Survival, 2012-2014 0.83 0.93 0.61 0.67 Richland

  10. Survival / 10 km 0.89(17 km) 0.97 (22 km) 0.95 (95 km) 0.95 (74 km) Richland

  11. 68% Mortality ReleaseRichland 17% (10083) 6% (8377) 30% (7747) 15% (4732) Richland

  12. Release Roza Naches Sunnyside

  13. 2014 Tommy, insert new content here.

  14. Tommy, insert new content here.

  15. Photo Credit: WA Dept. of Ecology

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