Lake Nasworthy (Colorado River Basin)
Lake Nasworthy is located approximately six miles southwest of San Angelo in Tom Green County, on the South Concho River, a tributary of the Concho River which is a tributary of the Colorado River. The lake is named for John R. Nasworthy who sold the land the lake is currently located on to the city. The project is owned by the city of San Angelo (originally by West Texas Utilities Company) for municipal and industrial water supply and recreational purposes. Authorization (Water Right Permit No. 1120) for the dam was issued by the State Board of Water Engineers in April 15, 1929. Construction of the dam started in January 1929 and was completed in June 1930. Deliberate impoundment of water began March 28, 1930. Nasworthy Dam is an earthfill embankment of 5,480 feet long (including spillways which is made by concrete) with a maximum height of about 50 feet. According to TWDB 1993 survey, the lake has a capacity of 10,108 acre-feet encompassing a surface area of 1,596 acres at the top of the conservation pool, elevation 1,872.2 feet above mean sea level. The lake drains an area of 3,833 square miles, including the areas controlled by other lakes upstream.