STS062-104-009 San Angelo, Texas, U.S.A. March 1994 Situated between large Twin Buttes Reservoir and smaller O. C. Fisher Lake is San Angelo, a west-central Texas city on the Edwards Plateau. Visible are numerous streams that feed Twin Buttes Reservoir; the dam, which appears as a white linear feature on the northeast side of the reservoir; and numerous cultivated fields east of San Angelo within the Concho River drainage basin.