NABSQNO 15S-465360-3985680Lost Valley Natural Bridge, Newton County, Arkansas Photo by Jay Wilbur NABSQNO 15S-465360-3985680. Lost Valley Natural Bridge is a small waterfall natural bridge eroded through limestone of the Boone Formation by Clark Creek. It is located in Newton County, Arkansas, in the Lost Valley area of the Buffalo National River complex. Access is via a well maintained hiking trail.
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