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Photo: Jason Hickey, CC BY 2.0 via Wikimedia Commons
A small monument located about 50 miles uplake (about a two-hour boat ride) from the Glen Canyon Dam, set around the world's largest known natural bridge. The monument can be accessed from a wharf on the lake, followed by a short walk up the canyon.
Rainbow Bridge is a natural arch in southern Utah, United States. With a span of 275 feet (84 m), as reported in 1974 by the Bureau of Reclamation, and height of 290 feet (88 m), it is one of the largest natural arches in the world. At the top it is 42 feet (13 m) thick and 33 feet (10 m) 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. Rainbow Bridge National Monument was protected in 1910, and it is administered by Glen Canyon National Recreation Area.
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A geological feature of the Colorado River consisting of a grotto with high, vaulting walls and a deep central pool of water.