The way From Fontana Dam Rd., head west on NC 28. In 7.8 miles, turn right; drive .1 mile to parking.
Maps USGS quads Fontana Dam, Cades Cove, Calderwood, and Tapoco ($8 each, store.usgs.gov)
Permit Required for overnight stays; free. Pick up in person at the Twentymile Ranger Station. Reservations are required for Campsite 13 (make them up to one month in advance).
Contact Backcountry Information Office, (865) 436-1297; Backcountry Reservation Office, (865) 436-1231; nps.gov/grsm
Trip data Download a complete tracklog and key waypoints at backpacker.com/hikes/twentymile