Flathead Lake is a large natural lake in northwest Montana and is the largest natural freshwater lake by surface area that is west of the source of the Missouri River in the contiguous United States.
The lake is a remnant of the ancient, massive glacial dammed lake, Lake Missoula of the era of the last interglacial. Flathead Lake is a natural lake along the mainline of the Flathead River. It was dammed in 1930 by Kerr Dam at its outlet on Polson Bay, and the lake level was raised by 10 feet . It is one of the cleanest lakes in the populated world for its size and type.
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