"Wall Arch, located along the popular Devils Garden Trail at Arches National Park collapsed sometime during the night of August 4, 2008. Rock has continued to fall from the arms of the remaining portion of the arch necessitating the closure of the Devils Garden Trail just beyond Landscape Arch.
On August 7, 2008, representatives from both the National Park Service Geologic Resources Division and the Utah Geological Survey visited the site and noted obvious stress fractures in the remaining formation. Rock debris has completely blocked this section of the trail. The closure will remain in effect until visitor safety issues can be resolved.
First reported and named by Lewis T. McKinney in 1948, Wall Arch was a free standing arch in the Slickrock member of the Entrada sandstone. The opening beneath the span was 71-feet wide and 33-1/2 feet high. It ranked 12th in size among the over 2,000 known arches in the park."