Nowhere on its entire course does the Colorado River descend more precipitously than through Cataract Canyon. On night three of our river rafting adventure, the Colorado River will not rest. The roar of the cataracts will lull you to sleep, dance in your dreams, only to awaken you the next morning with a new song. Time to batten down the hatches and hold on because this is Cataract Canyon whitewater rafting at its best. Twenty-three BIG ONES, among them Mile Long, Ben Hurt and the grand-daddy of them all, The Big Drops, which is a succession of three heavy-hitters that will leave you laughing and cheering. We move 30 feet closer to sea level in less than a mile. Colorado River Rafting trips through Cataract Canyon begin in May and run through September.