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The Grand Canyon [a] is a steep-sided canyon carved by the Colorado River in Arizona, United States. The Grand Canyon is 277 miles (446 km) long, up to 18 miles (29 km) wide and attains a depth of over a mile (6,093 feet or 1,857 meters).
The last part of the Colorado River to be surveyed was the Grand Canyon itself. In 1869, John Wesley Powell with nine men set out on an expedition from Green River Station, Wyoming. They were the first part of non-natives to travel the length of the Grand Canyon, and the first to successfully travel by boat from the upper Green River to the ...
The approximately 350 miles (560 km) of the Colorado above the confluence of the Green, including the entire section within Colorado, was known as the Grand River. [2] [3] [4] Below the Green River the Colorado flows through Cataract Canyon, which contains some of its most difficult rapids.
Grand Canyon National Park is a national park of the United States located in northwestern Arizona, the 15th site to have been named as a national park.The park's central feature is the Grand Canyon, a gorge of the Colorado River, which is often considered one of the Wonders of the World.
The Grand Canyon section of the Colorado River, like several other big-water Western rivers, uses a rapids scale developed by Otis R. Marston of 1–10 for rapids, 10 being the most difficult. The International Scale of River Difficulty , which classifies rapids from class I to VI, is more common elsewhere in the US and internationally.
The resulting Grand Canyon of the Colorado River trends roughly east to west for 278 miles (447 km) between Lake Powell and Lake Mead. [69] In that distance, the Colorado River drops 2,000 feet (610 m) and has excavated an estimated 1,000 cubic miles (4,200 km 3) of sediment to form the canyon. [70]