Landscape Arch is STILL standing and is considered to be the longest natural arch in the world, with a measured span of 290.1 feet(88.4 m). Since 1991, however three slabs of sandstone measuring 30, 47, and 70 feet (9.1,14,and21m long) have fallen from the thinnest section of Landscape Arch, prompting the Park Service to close the trail that once passed beneath it.
So, Landscape Arch still stands, despite what the MSM tries to say.
For more info and picture of Landscape Arch, See: http://en.wikipedia.org/wiki/Landscape_Arch