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Concept
Rainbow Bridge National Monument
Summary
Rainbow Bridge National Monument is administered by Glen Canyon National Recreation Area, southern Utah, United States. Rainbow Bridge is often described as the world's highest natural bridge. The span of Rainbow Bridge was reported in 1974 by the Bureau of Reclamation to be . At the top it is thick and wide. The bridge, which is of cultural importance to a number of area Native American tribes, has been designated a Traditional Cultural Property by the National Park Service.
Two other natural arches, Kolob Arch and Landscape Arch, both also in southern Utah, have confirmed spans several meters longer than Rainbow Bridge, but by most definitions of the terms they are considered to be arches rather than bridges. With a height of Rainbow Bridge does indeed stand taller than either of its longer competitors, but it is outdone by Aloba Arch in Chad at . The world's tallest (though less easily accessible) arch is Töshük Tagh, better known as Shipton's Arch, in China at an estimated . Finally, Xianren Bridge (also known as Fairy Bridge), in Guangxi Province, China, with a span of about , and a height of the opening of , appears to be the natural bridge with the largest span in the world.
Rainbow Bridge is one of the most accessible of the large arches of the world. It can be reached 2 different ways. One is by a two-hour boat ride on Lake Powell from either of two marinas near Page, Arizona, followed by a mile-long walk from the National Park wharf in Bridge Canyon and this is the most common for most people, or second by hiking one or more days overland from a trailhead on the south side of Lake Powell which requires both hiking experience and a permit (obtain a permit from the Navajo Nation in Window Rock, Arizona).
Rainbow Bridge is made up of sandstone originally deposited by wind as sand dunes during the end of the Triassic and the Jurassic periods. The bridge lintel consists of Navajo Sandstone while Bridge Creek incises the Kayenta Formation below.
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