Flathead Lake

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Flathead Lake
Flathead Lake.jpeg
Coordinates47°54′6″N 114°6′15″W / 47.90167°N 114.10417°W / 47.90167; -114.10417Coordinates: 47°54′6″N 114°6′15″W / 47.90167°N 114.10417°W / 47.90167; -114.10417
TypeMoraine-dammed lake
Primary inflowsFlathead River
Swan River
Primary outflowsFlathead River
Catchment area8,587 square miles (22,240 km2)
Basin countriesUnited States
Max. length27.3 mi (43.9 km)
Max. width15.5 mi (24.9 km)
Surface area191.5 sq mi (496 km2)
Average depth164.7 ft (50.2 m)
Max. depth370.7 ft (113.0 m)
Water volume5.56 cu mi (23.2 km3)
Residence time3.4 years
Shore length1161.4 mi (259.7 km)
Surface elevation2,894 ft (882 m)
IslandsWild Horse Island, Cromwell, Bird, Bull, Melita, Shelter, Cedar, Mother-in-Law, Dream, etc.
1 Shore length is not a well-defined measure.

Flathead Lake is a lake in Montana. It covers 197 square miles (510 km2).