Relative Survival of Juvenile Chinook Salmon Through Bonneville Dam on the Columbia River

by John Ferguson, Corps of Engineers, Portland, United States,

Document Type: Proceeding Paper

Part of: Waterpower '91: A New View of Hydro Resources


Preliminary results of a multiple year study indicate that juvenile chinook salmon passing through the juvenile bypass system at Bonneville Dam second powerhouse during the summer have significantly lower survival rates compared to other treatment groups (upper and lower turbine, spillway, and downstream control). The spillway groups had the highest survival rate, followed by the downstream, frontroll, turbines, and finally, the bypass groups. There was no significant difference between the survival rates of the upper and lower turbine groups. Estimates of long term survival using adult returns are incomplete at this time. However, both the juvenile and adult data indicate that passage through the juvenile bypass system versus the turbines does not improve the survival of subyearling juvenile chinook salmon.

Subject Headings: Dams | Rivers and streams | Hydro power | Power plants | Fish management | Comparative studies | Fishways | Hydraulics | Oregon | United States

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