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Landscape Arch, in Arches Nat'l Park, is the longest, thinnest arch in the world. In its thinnest section the arch is
only 11 feet thick, yet it supports a span of rock approximately 300 feet long. This arch could collapse any time.
On September 1, 1991, a 73-foot slab of rock fell out from underneath the thinnest
section of the span,
reducing the thickness of the span from 16 feet to 11 feet.
On June 5, 1995, a 47-foot mass of rock
fell from the thinnest section of the
arch, followed by another 30-foot rock fall on June 21, 1995.
The short loop
trail that went directly underneath the arch is now closed because of
government
liability should more rock fall.
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