Jack's Arch is on a shelf in a tiny canyon to the left of the mouth of the San Juan River Arm of Lake Powell. It has a span of 56 feet and is number 7-8 in the Vreeland catalog. The man in the photo is John Emmerton. This unofficial name for the arch comes from National Park Service Ranger Jack Morehead, who reported the arch in 1971. However, the arch had been previously reported by Hugh Mizer in a U.S. Geological Survey paper in 1924, so it probably should be named Mizer Arch.
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