Grosvenor Arch is a magnificent natural double arch set in a spectacular and isolated area of Grand Staircase-Escalante National Monument. The white sandstone arch is 152 feet above the ground and spans nearly 90 feet.
To reach the arch requires about 10 miles of rough road driving along Cottonwood Canyon Road. This road is a spectacular feature with grand scenery all along its nearly 40-mile stretch from Kodachrome Basin State Park nearly to Kanab, Utah. The road follows the "Cockscomb," a 50-mile-long fault crossing the Grand Staircase and Vermillion Cliffs from north to south, one of the most remarkable geologic formations on the Colorado Plateau. The road is gravel, but generally it is in good-enough condition for a passenger car to make the trip to the arch. After wet weather the road can be difficult, so it is a good idea to check with the BLM rangers in Cannonville before attempting the drive if there is any doubt.
The turnoff to the arch is marked, and it is a mile down the access road to the parking lot. There are restrooms and a paved path at the arch site. Be sure to not only walk up under the arch but to walk around the left side path behind it as well. This is a great spot for photos, especially early and late in the day.
Cottonwood Narrows, an easy hike down a very scenic slot canyon, is another 3.5 miles down Cottonwood Canyon Road from Grosvenor Arch.