NABSQNO 13S-247057-4420345An unnamed buttress natural arch, Rio Blanco County, Colorado Photo by Jay Wilbur NABSQNO 13S-247057-4420345. This unnamed buttress natural arch has eroded through Williams Fork sandstone. It is located on private property just west of Colorado Highway 13, about 9 miles south of its intersection with CO Highway 64 near Meeker, in Rio Blanco County, Colorado. It is easily visible from the highway. This arch was included in the Vreeland catalog as number 23-129. It has a span of about 8 feet and a height of about 16 feet.
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