Twin Buttes Reservoir is a man-made lake located near San Angelo, Texas. The reservoir was built in 1963 for flood control and municipal water supply purposes. The reservoir is fed by the South Concho River, which flows through the city of San Angelo. The hydrology of the reservoir is mainly associated with surface water flow from the South Concho River. The reservoir is the primary water source for the city of San Angelo and the surrounding area. The reservoir also provides irrigation water for agriculture and is a popular destination for recreational activities such as fishing, boating, and camping. The reservoir's snowpack is minimal and does not significantly contribute to the water supply. Overall, Twin Buttes Reservoir is an important resource for the region's water supply and recreation.