The Sun River (also called the Medicine River) is a tributary of the Missouri River, approximately 130 mi (209 km) long, in Montana in the United States.
It rises in the Rocky Mountains in two forks, the North Fork and South Fork , which join in the Flathead National Forest above Gibson Reservoir along the county line between Teton and Lewis and Clark counties. It flows E, SE, and E away from the mountains, past Simms, Sun River, and Vaughn and joins the Missouri at Great Falls.
The water of the river is used extensively for irrigation, through the Sun River Project of the United States Bureau of Reclamation. The irrigation area covers approximately 92,000 acres (372 km²).
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