The team made vibration measurements four times at the site in 2017, focusing on a prominent crack working through the center of the span that appeared to be putting the structure in jeopardy. The “before-after” comparison below was assembled by Holly Walker. The “before collapse” photos here were taken by Jeff Moore, and the “after collapse” photos were taken by Paul Geimer. The arch was cataloged by Stevens and McCarrick as SA-137 and had a reported span of 11.7 feet.Ī research team from the University of Utah, including Jeff Moore and Paul Geimer, had actually been studying this arch not long before the collapse. A park ranger noticed it was no longer standing during a hike in February.
But for now, at least, Landscape Arch is still standing, its sandstone span creating a natural bridge in the blue skies above Arches National Park.Rainbow Arch, located just above the visitor center in Arches National Park, collapsed sometime this winter. The Park Service was forced to close the trail that ran beneath the arch. Then, in June 1995, two more rocks fell from the arch, one measuring 47 feet and the second 30 feet. In 1991, a 73-foot slab of rock fell from underneath the thinnest section of Landscape Arch.
And while Fairy Bridge looks like it could survive for many more centuries, Landscape Arch, like other arc natural arches, is presumed to be very old and near the end of its lifecycle. Landscape Arch-an arc natural arch-is a spindly thing in comparison. The latter-an example of a meander natural bridge-is a gargantuan arch with a mighty girth. Landscape Arch and Fairy Bridge, however, are very different arches. At around 400 feet (across the span of its opening), the Fairy Bridge has, since 2010, been considered the longest natural arch in the world. The longest of these was Fairy Bridge (Xian Ren Qiao), a natural bridge carved through limestone karst by the Buliu River in the Guangxi Province. Its potential as a world-record setter, however, was scuppered by accurate measurements of a handful of arches in China. Landscape Arch, therefore, was the largest natural stone arch in the United States. But when they measured Kolob in 2006, they found it had a span of 287.4 feet, just a little shorter than Landscape Arch. When they published their findings, the researchers believed that Kolob Arch in Zion National Park, Utah, was slightly longer, and therefore potentially the longest in the world. They found that it had a span of 290.1 feet (plus or minus 0.8 feet), a height of 77.5 feet, a width of 18 feet, a thickness of 6 feet, and an opening breadth of 295 feet. In 2004, a team used laser technology to measure Landscape Arch. Landscape Arch is located inside Arches National Park, a 76,679-acre park named for the 2,000 or so natural sandstone arches that dot its high-desert landscape. But then comes Landscape Arch in Arches National Park, Utah, recognized by NABS as the fifth-longest natural arch in the world, and the longest outside China. And in these rankings China is most definitely king, with all four of the world’s longest natural arches located within its territory. NABS, however, has ranked the world’s longest natural rock arches by span, defined as the horizontal extent of unsupported rock in the arch.
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Not only is the available data not always consistent, there’s also the problem of how to define “largest” or “longest” when it comes to arches. Ranking the world’s natural arches by size isn’t a precise science, as the Natural Arch and Bridge Society (NABS) is quick to point out in its global rankings.
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