| Registry Numbers | US 1731, VA 32 (view other lookout sites in United States, Virginia) |
| Date Registered | July 31, 2018 |
| Nominated by | Kristin Reynolds |
| Location |
Jefferson National Forest Craig County, Virginia |
| Coordinates |
N 37° 26.500' W 080° 10.867' (view using Google Maps) N 37° 26' 30" W 080° 10' 52" N 37.441667° W 080.181111° |
| Elevation | 3,608 ft (1,100 m) |
| Built | 1930s |
| Administered by | U.S. Forest Service |
Earn Knob, also known as Sinking Creek Mountain Tower, was neighbor to towers on both Potts Mountain and Butt Mountain.