|Location||Big Horn / Carbon counties in Montana; and Big Horn County in Wyoming|
|Primary inflows||Bighorn River|
|Primary outflows||Bighorn River|
|Catchment area||20,000 square miles (50,000 km2)|
|Basin countries||United States|
The reservoir is 40 mi (64 km) south of Billings, Montana. It stretches the entire 72 mi (115 km) length of the Bighorn Canyon at full pool. The Lake was created by the 1965 construction of Yellowtail Dam on the Bighorn River, near Fort Smith, Montana.
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