NABSQNO 12S-685644-4335217![]() Hole in the Bridge Arch, Mesa County, Colorado Photo by Jay Wilbur Example Cave Natural ArchNABSQNO 12S-685644-4335217. Hole in the Bridge Arch is an adult cave natural arch eroded through Entrada sandstone. The secondary opening through the main lintel gives the arch its unusual name. It is considered an adult because most of the cave roof has collapsed. It is located above Rattlesnake Canyon in a wilderness study area west of Colorado National Monument, Mesa County, Colorado. To access the arch contact the BLM office in Grand Junction for a permit and directions.Hole in the Bridge Arch is listed in the Vreeland catalog as 18-24. He reported a span of 40 feet.
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