The Tongue River Dam () is a dam in

Big Horn County, Montana Big Horn County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 13,124. The county seat is Hardin. The county, like the river and the mountain range, is named after the bighorn sheep in the Rocky Mou ...

, 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 (northward) to its confluence with the Yellowstone River.

References

{{Authority control Dams in Montana Reservoirs in Montana United States state-owned dams Buildings and structures in Big Horn County, Montana Dams completed in 1939 Landforms of Big Horn County, Montana 1939 establishments in Montana