The Barkley is considered one of the toughest 100 mile races in the world. It has 52,900 feet of climb (and 52,900 feet of descent), more than any other 100 mile race, more than the 33,000 ft. of climb at Hardrock, and more than the 45,000 ft. at Nolan's 14.

Since the race began in 1986, only 6 runners out of about 600 have finished within the 60 hour cutoff. Mark Williams of the UK finished first in 1995 in 59:28. Here is his race report. In 2001, after several failed attempts, Blake Wood, 42, NM, and David Horton, 50, VA, finished together in 58:21, only to be disqualified for inadvertently leaving the course to follow a parallel route for about 200 yards. This route (on the south side of the stream instead of the north side) has slightly better footing and had been the normal route until 2000.

To give you some idea of the difficulty of this course, Blake had won the 2001 Rocky Raccoon 100 in 16:13, and the 1999 Hardrock 100 in 30:11. David Horton won Hardrock in 29:35 in 1993 and held the course record for the Appalachian Trail (2160 miles in 52 days) until recently.