Passage and Survival of Yearling and Subyearling Chinook Salmon and Steelhead Smolts at Lower Granite Dam, 2018
The purpose of this passage and survival study was to estimate fish performance metrics associated with passage through Lower Granite Dam (LGR) for emigrating yearling and subyearling Chinook salmon and steelhead smolts in 2018. The performance metrics estimated during this study included dam passage survival, forebay-to-tailrace survival, forebay residence time, tailrace egress time, and spill passage efficiency (SPE). Under the 2008 Federal Columbia River Power System (FCRPS) Biological Opinion (BiOp), dam passage survival probability is required to be greater than or equal to 0.96 for spring migrants, greater than or equal to 0.93 for summer migrants, and estimated with a standard error (SE) less than or equal to 0.015. This 2018 study was designed to achieve a standard error of 0.025 to reduce the number of tagged fish required during testing. The study also estimated smolt passage survival from the forebay (1 km upstream of the dam) to the tailrace (2 km below the dam). These areas coincide with the boundaries of the Boat Restricted Zone (BRZ) upstream or downstream of the dam, so this metric is also known as “BRZ-to-BRZ survival.” Forebay residence time, tailrace egress time, and SPE were also estimated, as required in the Columbia Basin Fish Accords (Fish Accords).
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 2007416
- Report Number(s):
- PNNL-28579
- Country of Publication:
- United States
- Language:
- English
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