Flathead (flătˈhĕd) [key], river, c.240 mi (390 km) long, rising as the North Fork, in SE British Columbia, Canada, and flowing generally SE through NW Montana, to Coram, where it is joined by the Middle Fork (c.85 mi/140 km long) and the South Fork (c.80 mi/130 km long). It continues S through Flathead Lake, then W and S to Clark Fork River. A 78-mi (125-km) section of the river borders Glacier National Park and is administered by the National Park Service. Hungry Horse Dam and Kerr Dam are the centers of hydroelectric, irrigation, and flood control projects in the river's basin.
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