The Summit Rock-Crater Trail is an abandoned Forest Service Road used primarily by ATVs and motorcycles in summer and snowmobiles in the winter. Views of Mt. Bailey, Mt. Thielsen and Diamond Lake are available along the way. The trail is closed to vehicles having a wheel base greater than 54 inches. The lower 4.5 miles consists of the old Summit Rock Road. The trail has two highway crossings, one near the gas station, the other at Hwy. 138. This trail parallels the Mt. Thielsen Wilderness and motorized vehicles are prohibited here. The soils are too fragile to allow any off trail riding anywhere along the length of this trail. Motorized use is restricted when you reach the Winema National Forest boundary. No water is available along the trail.
Directions from Prospect: Travel north on Highway 230 to its junction with Highway 138. Continue on 138 and turn west onto Road 4795, the north entrance to Diamond Lake Recreation Area. Proceed .3 miles and turn right at the gas station, keep going straight until you arrive at a large parking area near Hilltop Shop. Download here and follow signs to pick up the trail behind the gas station. The trail immediately crosses Rd 4795.