The railroad bridge at Flat Swamp has the lowest clearance of any overhead obstruction as far as i have seen. I went to savehighrock.org and did a little math for the actual clearance. So today the lake is 3.09 feet below full pool and the clearance is 5.44ft. So 5.44 minus 3.09 will leave 2.35 ft. at normal pool. Pretty close to what Sundance said. To be sure this lake is full of crappie. Good luck in your fishing.