The trail leaves Gray's Arch Picnic Area on the ridge top passing through mixed pine/hardwood stands with Blueberry and Huckleberry understory. It then descends into a deep gorge under towering cliffs. Below the cliff lines are cove hardwoods with moist heath rhododendron understory and rich flora of Showy Orchids, American Ginseng, and lush Hay-scented Ferns. This trail leads to a large fenced rockshelter where historic saltpeter miners built crude wooden troughs which were filled with sandstone fragments and then poured water through the sand to leach out potassium nitrate -the Ingredient used to make gunpowder during the civil war. This dry rockshelter now contains a historical feature of a hut claimed to have been a winter residence of pioneer Daniel Boone. A few rockhouses In this area have pre-historic Indian pertroglyphs and some can be seen from short spurs along this trail.

• Start: Gray's Arch Picnic Area
  
• End: Daniel Boons Hut
  
• Trail Connections: Martin's Fork Trail
  
• Elevation: 1000'- 1270'

Turn South off the Mountain Parkway at Slade. KY to Highway 11. Follow Hwy. 11 North 0.1 miles to Hwy. 15. Travel East on Hwy. 15 3.2 miles to Tunnel Ridge Road on the left. Follow Tunnel Ridge Road 0.9 miles to Gray's Arch Picnic Area on the right.

A few rockhouses In this area have pre-historic Indian pertroglyphs.