Rattlesnake Canyon is a scenic area within the Black Ridge Canyons Wilderness which in turn forms the core of the Bureau of Land Management administered McInnis Canyons National Conservation Area in west central Colorado. The canyon contains 9 natural arches, the second highest concentration of such arches in the United States, after the much better known Arches National Park. Limited access and primitive facilities limit visitation and help preserve the wilderness in its natural state.
Access to the canyon is either by a strenuous 7 mile hike from the Pollack Bench trailhead or by the Black Ridge access roads. The latter are reached via the adjacent Colorado National Monument. These dirt roads are open seasonally and should only be attempted in a high ground clearance four wheel drive vehicle under dry conditions due to steep, rocky grades [1]. According to BLM rangers, at least four vehicles were stranded on these roads during the 2006 season after unexpected rains made the roads impassable.2
The arches loop trail starts with steep descent through the first arch and continues past 6 more arches before ascending to join the Pollack Bench trail. An easy trail leads along the cliff top but affords only a limited view of the arches.
2 - Personal contact with BLM Ranger, 11/11/06