'Double Arch' at Glen Canyon National Recreation Area has collapsed: National Park Service | FOX 10 Phoenix
The Double Arch, per park officials, was a frequently visited geological feature, and it collapsed on Aug. 8. Changing water levels and erosion are believed to have contributed to the collapse.
https://www.fox10phoenix.com/news/double-arch-glen-canyon-national-recreation-area-has-collapsed-national-park-service