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The CENWP technical lead was Mr. Brad Eppard. This report presents survival, behavioral, and fish passage results for tagged yearling Chinook salmon and juvenile steelhead as part of a survival study conducted at John Day Dam during spring 2011. This study was designed to evaluate the passage and survival of yearling Chinook salmon and juvenile steelhead to assist managers in identifying dam operations for compliance testing as stipulated by the 2008 Federal Columbia River Power System Biological Opinion and the 2008 Columbia Basin Fish Accords. Survival estimates were based on a paired-release survival model.

Pacific Northwest National Laboratory (PNNL) and subcontractors conducted an acoustic-telemetry study of juvenile salmonid fish passage and survival at Bonneville Dam in 2010. The study was conducted to assess the readiness of the monitoring system for official compliance studies under the 2008 Biological Opinion and Fish Accords and to assess performance measures including route-specific fish passage proportions, travel times, and survival based upon a single-release model. This also was the last year of evaluation of effects of a behavioral guidance structure installed in the Powerhouse 2 forebay. The study relied on releases of live Juvenile Salmon Acoustic Telemetry System tagged smolts in the Columbia River and used acoustic telemetry to evaluate the approach, passage, and survival of passing juvenile salmon. This study supports the U.S. Army Corps of Engineers continual effort to improve conditions for juvenile anadromous fish passing through Columbia River dams.v PrefaceThe U.S. Army Corps of Engineers (USACE) Portland District, contracted with the Pacific Northwest National Laboratory (PNNL), in Richland, Washington, to conduct an acoustic-telemetry survival study at the Bonneville Dam in 2010. The PNNL assembled a study team consisting of staff from PNNL, the Pacific States Marine Fisheries Commission (PSMFC), and the University of Washington. The Portland District provided all funding and oversight.This final report presents behavioral and fish passage results for tagged yearling and subyearling Chinook salmon smolts and juvenile steelhead as part of a survival study conducted at Bonneville Dam during 2010.This report was originally published in December 2011. It was revised in August 2012 to address review comments from the Studies Review Work Group of the USACE's Anadromous Fish Evaluation Program. One important change was to revise the fish collection section to clearly present numbers and percents of fish rejected, excluded, tagged and released alive or dead, and to list the sum of extra fish that were collected but not needed to fulfill the daily tagging quota. The fish passage efficiency statitics were added to Tables ES-2 and ES-3. A paragraph describing comparisons of spill treatment and day and night effects in summer and Table 6.8 were added to Section 6.6. We also added tables of subyearling Chinook survival results for combinations of day, night, and spill level to the appendices. We did not accept the recommendation of one reviewer to limit reporting to single-release survival estimates and to avoid using passage survival through the Bonneville Powerhouse 2 Corner Collector as a virtual reference release to make surrogate estimates of paired-release survival. All capture histories and single-release survival results were the primary focus of this report and were tabled in the Executive Summary and appendices. Estimation of surrogate paired-release survival estimates was a reasonable and informative exercise that was retained for readers that might be interested, but those estimates...