NABSQNO 12T-669720-4483380Sand Canyon Arch, Moffat County, Colorado Photo by Dave Kennedy NABSQNO 12T-669720-4483380. Sand Canyon Arch is a cave natural arch eroded through Weber sandstone. It is located in upper Sand Canyon, just north of the Echo Park Road (dirt) in Dinosaur National Monument, Moffat County, Colorado. It has a span of about 20 feet.
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