Canyon Ferry Dam is a concrete gravity dam in a narrow valley of the Missouri River USA where the Big Belt Mountains and the Spokane Hills merge approximately 68 miles (109 km) downstream from the confluence of the Gallatin Madison and Jefferson Rivers and about 20 miles (32 km) east of the city of Helena Montana. The dam is for flood control irrigation recreation and hydroelectric power. The building of the dam created a reservoir known as Canyon Ferry Lake.
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