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Bonneville Dam Location: Bonneville, Oregon Columbia River mile: 146.1 Operator: U.S. Army Corps of Engineers Type: Run of river dam and reservoir Completed: 1938 (Powerhouse I: 10 turbine units); 1982 (Powerhouse II: 8 turbine units and 4 fishways) Generating capacity: 1,050 megawatts Juvenile fish passage facilities: Screens on all turbine units with a bypass system to tailwater. Adult fish passage facilities: Fish ladders with fish counting stations at both powerhouses. Additional notes: A juvenile bypass was completed in 1999 for powerhouse II. More info about this dam (off-site link)