what county is canyon lake in
Canyon Lake. Canyon Dam and Reservoir, located on the Guadalupe River, Comal County, is a joint project between the U.S. Army Corps of Engineers and the Guadalupe-Blanco River Authority (GBRA) . The dam was built for two reasons: 1) to control flood events that originated in the watershed of the Guadalupe River in the Texas Hill Country. 2) for GBRA to have a stored supply of water available for citizens in the Guadalupe River Basin during times of drought. Built in the early 1960's, the dam is constructed of rolled, compacted earth.