Tongue River Dam
The Tongue River Dam is a dam in Big Horn County, Montana, United States, a few miles north of the Wyoming state border. It impounds the Tongue River, creating the Tongue River Reservoir.
The earthen dam was constructed in the river canyon in 1939, with a height of and a length at its crest of. It impounds Montana's north-flowing Tongue River for flood control and irrigation water storage. The dam and reservoir are owned and operated by the Montana Department of Natural Resources and Conservation.
The riverine reservoir it creates has a normal water surface of, a maximum capacity of, and normal storage of. Recreation includes boating, fishing for bass, crappie, walleye and northern pike, and camping in the Tongue River Reservoir State Park. For white-water rafters, the Tongue is a Class I river from the Dam downstream to its confluence with the Yellowstone River.