Our Colorado whitewater rafting trips run through the grand canyons of every major Colorado River tributary and offer spectacular scenery and landscapes unlike anything you’ll find anywhere else in the world. River trips have a class rating according to the difficulty of their toughest rapid. Class II trips consist of flat water and gentle waves. Trips rated Class III include moderate waves and obstructions (rocks, gravel bars etc.) in the river. Class IV is bigger and faster than class III. Trips rated Class V are the most difficult with large waves, powerful currents, and unpredictable hazards.