Wall Arch was a natural stone arch located in the Arches Natural Park in the state of Utah. The formation managed to reach 71 feet of length. It was ranked 12th among the park's largest arches.
The arch collapsed at some time during the night of August 4th, 2008. The processes involved in this phenomenon where:
- Dilatation which caused numerous rock fractures along the arch.
- Erosion, which caused the rocks that were supporting the arch to slightly slide and break the equilibrium.
- The gravity that was the force which brought the weakened structure down.
