Lake Buchanan was formed by the construction of Buchanan Dam by the Lower Colorado River Authority to provide a water supply for the region and to provide hydroelectric power. Buchanan Dam, a structure over 2 mi (3.2 km) in length, was completed in 1939. Lake Buchanan was the first of the Texas Highland Lakes to be formed, and with 22,333 acres (34.9 sq mi; 90.4 km2) of surface water, it is also the largest.
Fish and wildlife populations: Lake Buchanan has been stocked with several species of fish intended to improve the utility of the reservoir for recreational fishing. Fish present in Lake Buchanan include largemouth bass, catfish, white bass, and striped bass.
