Cottonwood Canyon Road runs from Highway 89 north to Cannonville, Utah. It lies along the western side of the Kaparawitz Plateau and follows the Cockscomb Monocline. The Cockscomb is a geologic uplift that exposed ancient rock formations in a very colorful display. Cottonwood Canyon Road also passes near another geologic wonder, the Grosvenor Arch. Named for Gilbert Hovey Grosvenor, president of the National Geographic Society and the first full-time editor of National Geographic Magazine, the double sandstone arch towers 150 feet above the surrounding terrain. The north end of the road is paved to the entrance to Kodachrome Basin State Park with its colorful sandstone arches and comfortable campgrounds. Cottonwood Canyon Road can be driven by two-wheel drive vehicles when dry. Sections of the road turn very muddy and slick after significant rain and become impassable.