Tribes, Corps Studying Impacts Of Sediment Buildup (Deltas) At Mouths Of Columbia River Tribs; Impacts Temps, Predation, Salmon Survival

The amount of sediment carried by Columbia River waters to the Pacific Ocean has declined by about half since Bonneville Dam was built in 1935. Much of the sediment no longer moved by the river has found a home at the mouths of tributaries, creating shallow sediment fans or deltas where warm water and predators impact juvenile salmon and steelhead, some listed under the federal Endangered Species Act.

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