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Kerr Dam . The Kerr Dam, officially known since 2015 as the Seli''š Ksanka Qlispe'' Dam, is a concrete gravity-arch dam located at river mile 72 of the Flathead River.Built in 1938, it raises the level and increases the size of Flathead Lake near Polson, Montana.The dam was designed to generate hydroelectricity but also serves recreational and irrigation uses. ...