Sycamore Highlands trailhead, Norfork Trail. We'll clear away tornado blowdowns, both sawyers & Swampers needed. Bring work gloves, loppers. Directions. Trailhead at Sycamore Highlands aka Devils Backbone. From Mountain Home Bypass, drive 4.6 miles south on state highway 5, then turn left on highway 342. Highway 342 is known as Sycamore Springs Road. Drive 2.5 miles (stay right at fork), and turn right on Lake Heights Drive into the Sycamore Highlands subdivision. Follow Lake Heights Drive 0.7 mile straight through the subdivision, past dead end sign and the last house in the subdivision. Trailhead parking is just beyond the tree line. Spur trail leads 100 yards to Norfork Trail, which forks north and south. GPS N36 16'55", W92 15'38" (36.282070 -92.260499).