Lake Amistad Fishing Map An impoundment of the Rio Grande River, Lake Amistad stretches approximately 81 miles along the Rio Grande River and is an excellent fishery for Largemouth Bass, White Bass, Striped Bass, Channel Catfish, and Smallmouth Bass. Made of durable, waterproof material Shaded depth areas Expertly researched, color coded, marked fishing areas included and boat accesses clearly marked