Lake Alan Henry is a reservoir situated in the upper Brazos River Basin in the United States. Created by the construction of the John T. Montford Dam in 1993, it is operated and used as a future tertiary water supply by the city of Lubbock, Texas and serves as a recreational spot for the region of West Texas. The surface area of the lake is 2,880 acres with a me…Lake Alan Henry is a reservoir situated in the upper Brazos River Basin in the United States. Created by the construction of the John T. Montford Dam in 1993, it is operated and used as a future tertiary water supply by the city of Lubbock, Texas and serves as a recreational spot for the region of West Texas. The surface area of the lake is 2,880 acres with a mean depth of 40 ft. Lake Alan Henry is located 4 miles east of Justiceburg, Texas, and 45 miles south of Lubbock.