U.S. Elevation    - Highest point Clingmans Dome [ 2 ] [ 3 ] 6,643 ft (2025 m)  - Mean 900 ft  (270 m)  - Lowest point Mississippi River at Mississippi border [ 2 ] [ 3 ] 178 ft (54 m) Before statehood Southwest Territory Admission to Union   June 1, 1796 (16th) Governor Bill Haslam