An unnamed cave natural arch, Rio Blanco County, Colorado
Photo by Jay Wilbur
NABSQNO 12S-693532-4412747. This unnamed cave natural arch has eroded through Mesa Verde sandstone. It is the southernmost of a pair of cave natural arches located just west of Colorado Highway 139 between mile markers 53 and 54, about 18 miles south of Rangely in Rio Blanco County, Colorado. It has a span of about 10 feet.