View uncertainty details

UncertaintyHow does multiple dam passage versus transportation affect juvenile-to-adult survival rates for each species?
ThemeHydrosystem flow and passage operations
SubthemeIn-river versus transportation
Sources ISAB 2010-2: Review of NOAA 2010 Low Flow Fish Transport
ISRP/ISAB 2009-1: Tagging Report
NPCC Science Policy Exchange Summary 2007
NPCC 2006-3: Research Plan 2006
Criticality Level Priority
Rationale Recent studies (e.g., CSS reports) have shown that transportation benefits appear to be marginal for some stock, under certain flows at different times of the year. But other research studies indicate a potential problem with non-random sampling of fish for the transportation studies. Delayed mortality (D) is the ratio of ocean survival of Snake River fish that were transported to the ocean survival of similar fish migrating in-river. The CSS concluded that “Estimated D values for subyearling Snake River fall Chinook were below 1, for nearly all groups in the years 2006 to 2012. That was similar to patterns seen in yearling Chinook and steelhead (hatchery and wild groups) in the same years. A longer time series for subyearling Chinook would be helpful to determine if D estimates would have been higher prior to 2005 (the beginning of court-ordered summer spill) similar to the pattern seen for hatchery and wild steelhead groups that had D values that were well above 1 for several years prior to 2006.” Smith et al. (2013) found that with some exceptions, the estimated benefit of transportation was usually nearly constant throughout the season or steadily increasing for both wild and hatchery Chinook salmon. Estimated benefits of transportation for wild steelhead were relatively constant throughout the season for 8 of the 10 migration years. Hatchery steelhead exhibited more variation in patterns of transportation benefits than did wild steelhead. The reasons for the variation in results are unknown. However, Hostetter et al. (2015) indicated that juvenile bypass systems tend to select smaller fish in poorer condition compared to fish that use the spillway or turbine systems. Because the juvenile bypass system is used to select fish for transport, this may explain the negative findings of the effect of transport. Further studies on this question would benefit from incorporating multiple populations and collection locations plus multiple years to address these additional complexities.


Projects that address this uncertainty:

(click to view projects at cbfish.org)

ID Title Sponsor Locations Purpose Emphasis Addresses
199302900 Survival Estimate for Passage through Snake and Columbia River Dams and Reservoirs National Oceanic and Atmospheric Administration Hydrosystem RM and E Directly
199403300 Fish Passage Center Fish Passage Center, Pacific States Marine Fisheries Commission Programmatic RM and E Directly
199602000 Comparative Survival Study (CSS) Columbia Basin Fish and Wildlife Foundation, Fish Passage Center, Pacific States Marine Fisheries Commission, US Fish and Wildlife Service (USFWS) Programmatic RM and E Directly
199701501 Imnaha River Smolt Monitoring Nez Perce Tribe Blue Mountain/Imnaha Artificial Production RM and E Directly
200890800 FCRPS Water Studies & Passage of Adult Salmon & Steelhead Colville Confederated Tribes Hydrosystem RM and E Directly
198335003 Nez Perce Tribal Hatchery Monitoring and Evaluation (M&E) Nez Perce Tribe Mountain Snake/Clearwater Artificial Production RM and E Indirectly
198712700 Smolt Monitoring by Non-Federal Entities Fish Passage Center, Pacific States Marine Fisheries Commission Programmatic RM and E Indirectly
198802200 Umatilla Fish Passage Operations Umatilla Confederated Tribes (CTUIR) Columbia Plateau/Umatilla Habitat Restoration/Protection Indirectly
198902401 Evaluate Umatilla Juvenile Salmonid Outmigration Oregon Department of Fish and Wildlife Columbia Plateau/Umatilla Artificial Production RM and E Indirectly
198910700 Statistical Support For Salmon University of Washington Programmatic RM and E Indirectly
199000500 Umatilla Hatchery Monitoring and Evaluation (M&E) Oregon Department of Fish and Wildlife Columbia Plateau/Umatilla Artificial Production RM and E Indirectly
199000501 Umatilla Basin Natural Production Monitoring and Evaluation (M&E) Umatilla Confederated Tribes (CTUIR) Columbia Plateau/Umatilla Artificial Production RM and E Indirectly
199005500 Idaho Steelhead Monitoring and Evaluation (M&E) Studies Idaho Department of Fish and Game (IDFG) Mountain Snake/Clearwater Artificial Production RM and E Indirectly
199008000 Columbia Basin Pit-Tag Information Pacific States Marine Fisheries Commission Programmatic RM and E Indirectly
199105100 Modeling and Evaluation Statistical Support for Life-Cycle Studies University of Washington Programmatic RM and E Indirectly
199404700 Lake Pend Oreille Kokanee Mitigation Idaho Department of Fish and Game (IDFG) Intermountain/Pend Oreille Habitat RM and E Indirectly
199601900 Data Access in Real Time (DART) University of Washington Hydrosystem Data Management Indirectly
199604000 Mid-Columbia Reintroduction Feasibility Study Yakama Confederated Tribes Columbia Cascade/Methow, Columbia Cascade/Wenatchee Artificial Production Supplementation Indirectly
200003900 Walla Walla River Basin Monitoring and Evaluation (M&E) Umatilla Confederated Tribes (CTUIR) Columbia Plateau/Walla Walla Programmatic RM and E Indirectly
200302300 Chief Joseph Hatchery Program Colville Confederated Tribes Columbia Cascade/Okanogan Artificial Production Supplementation Indirectly
200729900 Investigation of Relative Reproductive Success of Stray Hatchery & Wild Steelhead & Influence of Hatchery Strays on Natural Productivity in Deschutes Oregon Department of Fish and Wildlife Columbia Plateau/Deschutes Programmatic RM and E Indirectly
200740200 Snake River Sockeye Captive Propagation Idaho Department of Fish and Game (IDFG) Mountain Snake/Salmon Artificial Production Supplementation Indirectly
200830700 Deschutes River Sockeye Development Confederated Tribes of Warm Springs Columbia Plateau/Deschutes Programmatic RM and E Indirectly
200850300 Studies into Factors Limiting the Abundance of Okanagan and Wenatchee Sockeye Salmon Columbia River Inter-Tribal Fish Commission (CRITFC) Columbia Cascade/Entiat, Columbia Cascade/Methow, Columbia Cascade/Okanogan, Columbia Cascade/Wenatchee Programmatic RM and E Indirectly
200851800 Upstream Migration Timing Columbia River Inter-Tribal Fish Commission (CRITFC) Programmatic RM and E Indirectly
200890700 Genetic Assessment of Columbia River Stocks Columbia River Inter-Tribal Fish Commission (CRITFC) Programmatic RM and E Indirectly
200900100 Expanded Multi-Species Acclimation in the Wenatchee/Methow Basins Yakama Confederated Tribes Columbia Cascade/Methow, Columbia Cascade/Wenatchee Artificial Production Supplementation Indirectly
201002600 Chinook and Steelhead Genotyping for Genetic Stock Identification (GSI) at Lower Granite Dam Idaho Department of Fish and Game (IDFG) Blue Mountain/Grande Ronde, Blue Mountain/Imnaha, Columbia Plateau/Snake Lower, Mountain Snake/Clearwater, Mountain Snake/Salmon Programmatic RM and E Indirectly
201003100 Snake River Chinook and Steelhead Parental Based Tagging Idaho Department of Fish and Game (IDFG) Blue Mountain/Grande Ronde, Blue Mountain/Imnaha, Columbia Plateau/Snake Lower, Mountain Snake/Clearwater, Mountain Snake/Salmon Programmatic RM and E Indirectly
201005700 B-run steelhead supplementation effectiveness research Idaho Department of Fish and Game (IDFG), Nez Perce Tribe Artificial Production RM and E Indirectly
201007600 Characterizing migration and survival for juvenile Snake River sockeye salmon between the upper Salmon River basin and Lower Granite Dam Idaho Department of Fish and Game (IDFG) Upper Snake/Snake Headwaters Predation RM and E Indirectly
201007700 Tucannon River Programmatic Habitat Project Snake River Salmon Recovery Board Columbia Plateau/Tucannon Habitat Restoration/Protection Indirectly

last updated: Jan 26, 2016