Relative Survival of Juvenile Chinook Salmon Through Bonneville Dam on the Columbia Riverby John Ferguson, Corps of Engineers, Portland, United States,
Abstract: 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 | Power plants | Turbines | Spillways | Hydro power | Comparative studies | Hydrologic data | Oregon
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