The Numbers Class III-IV: Test your endurance and paddle experience with whitewater adventure in the high country with big splashes and fast rapids. On this 2-3-hour trip, you'll run the Numbers 1-10 rapids, an incredibly fun section with pine forest lining the river banks and the Collegiate Peaks towering over 14,000 feet above the river corridor. Highly experienced guides touting the highest credentials will lead you along this exciting trip.