Medina Lake is actually a reservoir created by Medina Dam, along the Medina River. The lake is 18 miles long and 3 miles wide. This scenic oasis is located just west of Interstate 71, between Route 18 and Granger Road. Surface area is 5,426 acres. Maximum depth is over 150 feet, but it can be up to 40 feet lower when rainfall is sparse. More than 100 miles of shoreline encircle the lake. Medina Lake is just 24 miles southeast of Bandera, Texas.