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Roza Reach Smolt Survival Study
2012-2014
Cramer Fish Sciences
Tommy Garrison
Ian Courter
U.S. Geological Survey
Tobias Kock
Russell Perry
Photo Credit David Child
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Funding and Collaboration
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
Funding provided by:
U.S. Bureau of Reclamation
Yakima Basin Joint Board
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
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Competing Hypotheses
1. Low flows are causing abnormally high
mortality between Roza Dam and the
Naches-Yakima River confluence (“Roza
Reach”).
2. Low mortality in the Roza Reach due to
short residence time of emigrating smolts.
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Study Objectives
1. Quantify flow effects
on smolt survival in
the Roza Reach.
2. Partition effects of
Roza Dam passage
mortality from
migration survival
estimates.
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Progress Since 2014 Science Conf.
1. Comprehensive analysis of flow-
survival for the entire length of the
Yakima River.
2. Detailed evaluation of passage survival
conditions at Roza Dam.
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• 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
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Treatment Groups
date flow
3/29-4/2, 2013 575
4/7, 2012 588
3/26-3/30, 2014 937
3/21-3/27, 2013 1,317
4/17-4/19, 2013 1,396
4/4-4/9, 2014 1,778
4/25-4/29, 2013 2,093
4/18-4/25, 2014 2,487
4/29-5/4, 2014 2,718
5/12-5/13, 2012 2,806
4/5-4/8, 2013 3,351
5/19-5/22, 2012 4,324
Low
Moderate
High
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Travel Time
Days From Release (Median)
Roza Dam Tailrace 0.3 (0.1–1.7)
Wenas Creek 0.7 (0.1–2.7)
Naches River 1.0 (0.2–4.9)
Sunnyside 1.3 (0.6–6.1)
Prosser 8.8 (2.7–16.9)
Richland 9.9 (3.8–25.0)
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0.83
0.93
0.61
0.67
Median Survival, 2012-2014
Richland
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0.89 (17 km)
0.97 (22 km)
0.95 (95 km)
0.95
Richland
Survival / 10 km
(74 km)
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17%(10083)
6%(8377)
30%(7747)
15%(4732)
Richland
68% Mortality
ReleaseRichland
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Release
Roza
Sunnyside
Naches
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Tommy, insert new content here.
2014
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Tommy, insert new content here.
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Photo Credit: WA Dept. of Ecology