| Watts Bar Lake | |
|---|---|
 View from just north of TVA Watts Bar in Decatur, Tennessee | |
  Watts Bar Lake  Watts Bar Lake | |
| Location | Meigs / Rhea / Roane / Loudon counties, Tennessee, U.S. |
| Coordinates | 35°37′15″N 84°46′54″W / 35.62083°N 84.78167°W |
| Type | reservoir |
| Primary inflows | Tennessee River, Clinch River, Emory River |
| Primary outflows | Tennessee River |
| Basin countries | United States |
| Max. length | 72.4 mi (117 km) |
| Surface area | 39,000 acres (16,000 ha; 61 sq mi) |
| Max. depth | 108 ft (33 m) |
| Surface elevation | 741 feet (226 m) |
Watts Bar Lake is a reservoir on the Tennessee River created by Watts Bar Dam as part of the Tennessee Valley Authority system.