Wall Arch, one of the most accessible major arches in the Devils Garden area of Arches National Park, collapsed sometime Monday night.
"Not being a geologist, I can't get very technical but it just went kaboom," Chief Ranger Denny Ziemann said. "The middle of the arch just collapsed under its own weight. It just happens."
Wall Arch, located along the popular Devils Garden Trail, was 71 feet tall and 33 1/2 feet wide, ranking it 12th in size among the known arches inside the park. Lewis T. McKinney first reported and named Wall Arch in 1948.
No one reported observing the arch collapse and there were no visitor injuries,
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