Twin Hollow Trail Professional Review and Guide
"The Twin Hollow Trail begins at the end of Cottonwood Canyon Trail, at the same starting point as Northern #19: Green River Overlook Trail. After a couple of miles, the trail climbs about 600 feet out of Cottonwood Canyon. Special Attractions: The top end of Cottonwood Canyon, which is less traveled and very scenic; A network of remote 4WD trails, popular in hunting season; The high desert country of the Tavaputs Plateau; Endless remote backcountry campsites well away from the crowds. High-clearance 4WDs are recommended, though most stock SUVs are acceptable.
Expect a rough road surface with rocks larger than 6 inches, but there will be a reasonable driving line available. Patches of mud are possible but can be readily negotiated; sand may be deep and require lower tire pressures. There may be stream crossings up to 12 inches deep, substantial sections of single-lane shelf road, moderate grades, and sections of moderately loose road surface."