“a low mountain pass in eastern Idaho”
Red Rock Pass is a low mountain pass in eastern Idaho, south of Downey in southern Bannock County. It is geologically significant as the spillway of ancient Lake Bonneville. It is located along highway US-91 at an elevation of 4785 feet (1458 m) above sea level, bounded by two mountain ranges; the Portneuf to the east and the Bannock to the west. The pass was cut through resistant Paleozoic shale, limestone, and dolomite, and forms a narrow gap two miles (3 km) in length. At one time the pass was 300 feet (100 m) higher, where the shoreline of Pleistocene Lake Bonneville stood.
Daily Pass $5.00 (one calendar day)
This pass is valid for use as a parking permit to recreate in Red Rock Country including access to Red Rock Country Heritage Sites. It is not valid for the use of other fee areas, developed campgrounds, or these day-use sites operated by private permittee: Grasshopper Point Picnic and Swimming Area, Crescent Moon Day Use Area and Call O' the Canyon (West Fork Trailhead).
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Red Rock Pass
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