Lake McQueeney is a reservoir on the Guadalupe River located 5 miles (8 km) west of Seguin in Guadalupe County, Texas, USA. It was formed in 1928 by the construction of a dam to provide hydroelectric power to the area. Management of the dam and lake was assumed by the Guadalupe-Blanco River Authority on May 1, 1963. The lake's prominent feature is Treasure Island, a residential area that has been subjected to major flooding in 1972, 1998, and 2002. Most of it is approximately 10 feet (3 m) deep, with deeper sections along the center channel of the river.