Four Mile Bench spurs off Cottonwood Canyon Road, running 14 miles into the remote Kaparowitz Plateau. The trail climbs steeply along shelf roads up the face of the plateau. It also crosses Wahweep Wash, Blue Wash, and Tommy Smith Creek. These drainages are ordinarily dry but prone to flash flooding and washouts after heavy rains. Four Mile Bench ends at an intersection with Death Ridge Road, 313, marked as impassable by full-size vehicles.
The western end of Four Mile Bench passes Grosvenor Arch. The massive sandstone arch is actually two arches. They tower 150 feet above the desert, with the larger arch measuring 100 feet wide. There is a parking area with a vault toilet for those visiting this imposing natural wonder.
East of the arch, two small campsites sit on the south side of the road. One is a single-vehicle site very close to the trail, while the other is a lollipop site further off the trail. Neither are desirable campsites. Better camping options are available along Cottonwood Canyon Road.
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