Road 400 (Cottonwood Canyon Road) is a scenic 47 mile dirt road connecting U.S. Highway 89 with Utah S.R 12 at Cannonville. It traverses portions of Grand Staircase-Escalante National Monument offering a unique view into the heart of the Monument. The only other road (Smoky Mountain Road) crossing the entire Grand Staircase is also unpaved, nearly twice as long, and requires at a minimum a high clearance vehicle.
Road 400 is a reasonably good quality dirt road (mostly sand and clay over a sandstone foundation) during dry weather. If the road has been recently graded it may be suitable for passenger cars, however high clearance vehicles are recommended.