Called seeds-ke-dee by the Native Americans, the river was first explored by John Wesley Powell in 1869, who compared the sight with "a mountain drinking a river." Today, the wild waters of the Green River are regulated by Flaming Gorge Dam, which makes the river accessible to recreational floaters who enjoy the scenery, history, and Indian ruins in this area. One of the southwest's deepest canyons, Lodore Canyon, is located within Dinosaur National Monument and offers exciting rapids like Disaster Falls, Hell's Half-Mile, and Triplet Falls. The river averages descents of 13 feet per mile. Below Desolation and Gray canyons, the Green winds through Labyrinth and Stillwater canyons.