| Bighorn Lake | |
|---|---|
 Southwestern part | |
  Bighorn Lake  Bighorn Lake | |
| Location | Big Horn / Carbon counties in Montana; and Big Horn County in Wyoming |
| Coordinates | 45°18′28″N 107°57′27″W / 45.30778°N 107.95750°W |
| Type | reservoir |
| Primary inflows | Bighorn River |
| Primary outflows | Bighorn River |
| Catchment area | 20,000 square miles (50,000 km2) |
| Basin countries | United States |
Bighorn Lake is a reservoir behind Yellowtail Dam within the Bighorn Canyon National Recreation Area, located in northern Wyoming and extending into southern Montana.[1]