Lake Georgetown is a reservoir on the north fork of the San Gabriel River in central Texas in the United States. Lake Georgetown is a U.S. Army Corps of Engineers reservoir formed on the San Gabriel by the North San Gabriel Dam, which is located about three miles west of Georgetown, Texas. The dam, lake, and all adjacent property are managed by the Fort Worth District of the U.S. Army Corps of Engineers. The dam was officially completed on October 5, 1979, and serves to provide flood control for the community of Georgetown. Lake Georgetown is also a source of drinking water for Georgetown and the nearby city of Round Rock.