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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.
Because of the large range of difficulty that exists beyond Class IV, Class V is an open-ended, multiple-level scale designated by class 5.0, 5.1, 5.2, etc. Each of these levels is an order of magnitude more difficult than the last. That is, going from Class 5.0 to Class 5.1 is a similar order of magnitude as increasing from Class IV to Class 5.0.
Cataract Canyon, near the Big Drop Rapids. Cataract Canyon is a 46-mile-long (74 km) canyon of the Colorado River located within Canyonlands National Park and Glen Canyon National Recreation Area in southern Utah. It begins at Colorado's confluence with the Green River, and its downstream terminus is the confluence with the Dirty Devil River.
Murl [sic] Emory and the ring bolt in Black Canyon. from The Otis Marston Colorado River Collection, Huntington Digital Library; hdl.huntington.org accessed June 22, 2015. Photo of a ring bolt in Ringbolt Rapids, taken with Merl Emory lead boatman during the construction of Hoover Dam.
It draws visitors from around the world to its Class III rapids and mountain scenery. The sun sets as the French Broad River is seen in Madison County in North Carolina on Oct. 13, 2024.
A rafting party on the Colorado River. Famed for its dramatic rapids and canyons, the Colorado is one of the most well-known whitewater rivers in the United States, and its Grand Canyon section—run by more than 22,000 people annually [329] —has been called the "granddaddy of rafting trips". [330]
A new global analysis finds U.S. states along the Colorado River are under extremely high water stress. The region is grappling with how to reduce water use.
The Roaring Rapids were one of two of the significant hazards to navigation to steamboats, barges, and other shipping when ascending or descending the Colorado River between El Dorado Canyon and Callville, in the 19th Century. [2]: 47, 49 The other was the Ringbolt Rapids, 12 miles farther up the river. [3]