NABSQNO 14R-623151-3340365An unnamed arch in Travis County, Texas Photo by Jay Wilbur NABSQNO 14R-623151-3340365. This unnamed arch is a double waterfall natural bridge eroded through volcanic tuff. Although small, its unusual shape makes it quite photogenic. It is located at Lower McKinney Falls on Onion Creek in McKinney Falls State Park, Travis County, Texas. The larger opening has a span of about 5 feet.
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