Low Water, Low Flows Force Columbia River Hydro Managers To Drop Bonneville Dam Tailwater Levels Aimed At Protecting ESA-Listed Chum Salmon

There is so little water available from the upper reaches of the Columbia and Snake rivers that dam operators are dropping the tailwater elevation at Bonneville Dam to 10.2 feet above sea level. That’s a drop of more than 1.5 feet from the minimum tailwater elevation of 11.8 feet required to protect chum salmon nests, or redds, downstream of the dam.

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