Hell’s Backbone Road (Forest Road 153) is a 38-mile mostly unpaved road that connects the towns of Boulder, Utah and Escalante, Utah.
Halfway along the road is Hell’s Backbone Bridge, which is 109 feet (33 m) long, and 14 feet (4.3 m) wide. A 1,500-foot (460 m) drop is on either side. Near the bridge are views of the Box-Death Hollow Wilderness. From late spring to autumn, the road, which climbs to more than 9,000 feet (2,750 m) elevation, is passable by ordinary passenger vehicles, but it is very narrow and winding.
The road was built by the Civilian Conservation Corp (CCC) in the 1930’s. A side road branches off to an excellent campground at Posey Lake.