Cottonwood/Marble Road
10.5mi (17km). The first 8 miles (13km) is typically passable to a high clearance vehicle. After the 8 mile point, the road drops steeply into a deep wash where 4x4 is required due to pockets of deep gravel and small boulders for the next 2.1mi (3.4km) to the junction with Marble Canyon Road.