Wall Arch No More

Wall Arch - In Memory Of, originally uploaded by Crumblin Down.

This picture was taken by flickr user appropriately named Crumblin Down. The arch fell last Monday or Tuesday.

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.

The article linked above has before and after pictures.