NABSQNO 12S-686355-4334590Trap Arch, Mesa County, Colorado Photo by Jay Wilbur NABSQNO 12S-686355-4334590. Trap Arch is a pothole natural arch eroded through Entrada sandstone. It is located above Rattlesnake Canyon in a BLM wilderness area west of Grand Junction in Mesa County, Colorado. Access requires a permit and directions from the BLM ranger station in Grand Junction. Vreeland included this arch in his catalog as number 18-17 and reported a span of about 30 feet.
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