NABSQNO 15S-527640-4004130Ralph Natural Bridge, Marion County, Arkansas Photo by Jay Wilbur NABSQNO 15S-527640-4004130. Ralph Natural Bridge is a small waterfall natural bridge eroded through layers of Everton Formation dolomite and limestone by Mill Creek. It is located about a mile west of the small community of Ralph in Marion County, Arkansas. A public road goes over the top of the arch so access is easy.
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