They don't call it the Roaring Fork River for nothin'. Some areas of the 70-mile waterway produce churning, Class V rapids, the highest rating for rapids that exists. Luckily, the guides at Aspen Whitewater Rafting hit the roiling waterways with more than 25 years of experience navigating every part of the river—and the Arkansas River, as well. The staff puts that know-how to use during a number of trips that cater to all stripes of paddlers. Brand new rafters can take on the class II and III rapids of the Middle Roaring Fork, while advanced boatswains and river otters can plunge into class IV and V rapids of Slaughter House Falls.