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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.
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.
The Colorado River in the Grand Canyon has rapids, and the park service described it as “a highly technical river, not something for the inexperienced to try.” It runs 277 miles in the Grand ...
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]
It draws visitors from around the world to its Class III rapids and mountain scenery. ... Niagara Falls in high season and 10 times stronger than the Class IV rapids in the Colorado River at the ...
Westwater Canyon is a canyon located on the Colorado River in Eastern Utah between the Utah/Colorado state line and Cisco, Utah.The inner gorge of the canyon is made up of black Precambrian rock and contains class III and IV rapids which are sought after by whitewater enthusiasts.
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]