O.C. Fisher Reservoir (also known as O.C. Fisher Lake, formerly known as San Angelo Lake) is an artificial lake located west of the city of San Angelo, Texas. With the financial support of the Upper Colorado River Authority, construction on the dam to form the reservoir was begun by the United States Army Corps of Engineers in 1947 and the lake was officially impounded in 1952. Originally named San Angelo Lake, the reservoir was renamed in 1975 for local U.S. Congressman O.C.