Water & Geography
The Concho River and Three Reservoirs Shape This County
Tom Green County sits where three branches of the Concho River meet, and three reservoirs supply water to the San Angelo area.
The North, Middle, and South Concho rivers converge in Tom Green County and form the main Concho River. Three reservoirs — O.C. Fisher Lake, Twin Buttes Reservoir, and Lake Nasworthy — provide water supply and recreation for the region.
Water is scarce in West Texas. The county averages about 18 inches of rain a year. Drought conditions are common over long periods. If you are buying land with a water well, ask about aquifer depth and reliability. The Texas Water Development Board maintains groundwater data you can check online.
Source to confirm: Texas Almanac — Tom Green County