The Forest Service designed the Spearfish Quarry Trailhead for beginners to practice their motorized riding skills. The former gravel pit near the parking area is open to cross-country travel and there are four short trails accessible from the trailhead. Access the trailhead from Spearfish via Interstate 90, Exit 8, traveling south on McGuigan Road which merges to Tinton Road. Stay on Tinton Road (also National Forest Service Road, NFSR 134) for 1.6 miles. At Trail 8000, turn west (right) and proceed approximately 0.1 mile to the trailhead. [There is also a non-motorized trailhead on the east (left) side of the road as you travel up Tinton. Continue past the non-motorized trailhead another 0.25 mile to TR 8000 to access the motorized trailhead.