The Snake River in southeastern Washington state is the most endangered river in the nation because four dams have brought salmon runs to the brink of extinction, an environmental group says. The announcement by American Rivers marks the second consecutive year that a Washington river tops the environmental group's annual list, now in its 14th year. A 51-mile undisturbed stretch of the Columbia River known as the Hanford Reach topped the group's list last year. The Snake receives the most attention because of the Ice Harbor, Lower Monumental, Little Goose and Lower Granite dams. Snake River in Washington state.
Dams threaten salmon.
Missouri River in Montana, North Dakota, South Dakota, Nebraska, Iowa, Kansas and Missouri. Dams and channels hurt river. Alabama, Coosa and Tallapoosa rivers in Georgia and Alabama. Atlanta sprawl threatens water supply and quality. Upper San Pedro River in Arizona.