Water-eroded arches Natural arch

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a topographic map of coyote natural bridge in utah shows how meandering coyote gulch carved shorter route through rock under arch. old riverbed higher present water level.


some natural bridges may arches, form in path of streams wear away , penetrate rock. pothole arches form chemical weathering water collects in natural depressions , cuts through layer below.



rainbow bridge, natural bridge formed meandering watercourse


natural bridges national monument in utah protects area surrounding 3 large natural bridges of formed streams running through canyons. largest of named sipapu bridge span of 225 feet (69 m). rainbow bridge national monument s namesake formed flowing water created largest known natural bridge in western hemisphere span of 234 feet (71 m), based on laser measurement made in 2007. xianren bridge, known fairy bridge, in guangxi, china world s largest known natural bridge span recorded @ 400 feet (120 m) natural arch , bridge society in october 2010, precision of ±15 feet (4.6 m).








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