Twin Buttes Reservoir
| Twin Buttes Reservoir | |
|---|---|
| Location | Tom Green County, southwest of San Angelo, Texas |
| Coordinates | 31°22′37″N 100°32′01″W / 31.37694°N 100.53361°W |
| Type | Water supply reservoir |
| Primary inflows | Middle Concho River, South Concho River, Spring Creek |
| Primary outflows | Lake Nasworthy |
| Basin countries | United States |
| Surface area | 9,080 acres (3,670 ha) |
| Max. depth | 46 ft (14 m) |
| Water volume | 186,000 acre⋅ft (229,000,000 m3) |
| Surface elevation | 1,940 ft (590 m) |
| Settlements | San Angelo, Texas |
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Twin Buttes Reservoir is an artificial lake located about 6 mi (9.7 km) southwest of the city of San Angelo, Texas, and immediately upstream from Lake Nasworthy. Construction on Twin Buttes Dam to form the reservoir was completed in 1963. The dam is an unusual one – it dams the Middle and South Concho Rivers separately; a stabilization channel runs between the two sides of the lake. Water levels fell significantly during the 2010–13 Southern United States drought and remained low into 2014.