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Elevations range from 8,000 to 12,183 feet, according to the NPS. There are 60 miles of hard-surfaced road with a 5 to 7 percent grade. New Venture Cycling downhill guided bicycle tours are a good way to experience the famous park. You will ride by gorgeous plants, amazing wildlife and intimidating peaks. Rocky Mountain Rush offers the Epic Downhill Descent (Down Trail Ridge Road), starting in the land above the trees and clouds, in the company of marmots and elk.