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Tongue River Reservoir
Tongue River Dam
Location Big Horn County, Montana
Lake type Reservoir
Primary inflows Tongue River
Primary outflows Tongue River
Basin countries United States
Max. length 5.5 miles (8.9 km)
Max. width 1.1 miles (1.8 km)
Surface area 3,700 acres (1,500 ha)
Water volume 79,071 acre feet (97,533,000 m3)
Surface elevation 4,222 feet (1,287 m)

The Tongue River Dam (National ID # MT00002) is a dam in Big Horn County, Montana, 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 91 feet and a length at its crest of 1824 feet. 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 12-mile-long riverine reservoir it creates has a normal water surface of 5.5 square miles, a maximum capacity of 150,000 acre-feet, and normal storage of 69,400 acre-feet. 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.

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