List of Colorado River rapids and features

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The following is a list of major rapids and other notable features on the Colorado River through Marble Canyon and Grand Canyon below Glen Canyon Dam, in order of their position downstream of Lee's Ferry. Ratings are given for how difficult the rapid is to navigate by whitewater raft or other water craft. The Grand Canyon section of the Colorado River, like several other big-water Western rivers, uses a scale 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.

Grand Canyon A steep-sided canyon carved by the Colorado River in Arizona, United States

The Grand Canyon 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.

Glen Canyon Dam dam on the Colorado River, Arizona, USA

Glen Canyon Dam is a concrete arch-gravity dam on the Colorado River in northern Arizona, United States, near the town of Page. The 710-foot (220 m) high dam was built by the U.S. Bureau of Reclamation (USBR) from 1956 to 1966 and forms Lake Powell, one of the largest man-made reservoirs in the U.S. with a capacity of 27 million acre feet (33 km3). The dam is named for Glen Canyon, a series of deep sandstone gorges now flooded by the reservoir; Lake Powell is named for John Wesley Powell, who in 1869 led the first expedition to traverse the Colorado's Grand Canyon by boat.

Lees Ferry

Lees Ferry is a site on the Colorado River in Coconino County, Arizona in the United States, about 7.5 miles (12.1 km) southwest of Page and 9 miles (14 km) south of the Utah–Arizona border.

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Paria River river in southern Utah and northern Arizona

The Paria River is a tributary of the Colorado River, approximately 95 miles (153 km) long, in southern Utah and northern Arizona in the United States. It drains a rugged and arid region northwest of the Colorado, flowing through roadless slot canyons along part of its course.

Navajo Bridge

Navajo Bridge is a pair of steel spandrel arch bridges that cross the Colorado River near Lee's Ferry in northern Arizona. The newer bridge of the pair carries vehicular traffic on U.S. Route 89A (US 89A) over Marble Canyon between southern Utah and the Arizona Strip, allowing travel into a remote region north of the Colorado River including the North Rim of Grand Canyon National Park.

Georgie White Clark (1911–1992) was a river-running guide in the Grand Canyon. She was the first woman to run the Grand Canyon as a commercial enterprise, and she introduced several innovations and adjustments to the way that guides ran the Colorado. In particular, she used large army-surplus rafts, often lashing together multiple rafts, to maintain stability in the large rapids. In 2001, the United States Board on Geographic Names renamed Mile 24 Rapid in her honor.

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Rafting recreational outdoor activity

Rafting and white water rafting are recreational outdoor activities which use an inflatable raft to navigate a river or other body of water. This is often done on whitewater or different degrees of rough water. Dealing with risk and the need for teamwork is often a part of the experience.

Disappearance of Glen and Bessie Hyde

Glen and Bessie Hyde were newlyweds who disappeared while attempting to run the rapids of the Colorado River through Grand Canyon, Arizona in 1928. Had the couple succeeded, Bessie Hyde would have been the first woman known to accomplish this feat.

Oak Creek Canyon river gorge located in northern Arizona between the cities of Flagstaff and Sedona

Oak Creek Canyon is a river gorge located in northern Arizona between the cities of Flagstaff and Sedona. The canyon is often described as a smaller cousin of the Grand Canyon because of its scenic beauty. State Route 89A enters the canyon on its north end via a series of hairpin turns before traversing the bottom of the canyon for about 13 miles (21 km) until the highway enters the town of Sedona. The Oak Creek Canyon–Sedona area is second only to Grand Canyon as the most popular tourist destination in Arizona.

Cape Final Trail

The Cape Final Trail is a hiking trail on the North Rim of the Grand Canyon National Park, located in the U.S. state of Arizona.

Lewis R. Freeman American journalist

Lewis Ransome Freeman was an American explorer, journalist and war correspondent who wrote over twenty books chronicling his many travels, as well as numerous articles.

Haldane "Buzz" Holmstrom (1909–1946) was a pioneer of running the Colorado River through the Grand Canyon. He was the first person to float all the way from Green River, Wyoming to Boulder Dam solo. He built his own rowboats, often of his own design, to run whitewater rivers.

Norman Nevills American businessman

Norman D. Nevills was a pioneer of commercial river-running in the American Southwest, particularly the Colorado River through the Grand Canyon. He led trips including Dr. Elzada Clover and Lois Jotter, the first two women to successfully float the Grand Canyon, and Barry Goldwater.

Bert Loper American river runner

Albert A. "Bert" Loper was a pioneer of the sport of whitewater river-running in the American Southwest, particularly the Colorado River and its tributaries. He along with many of the noted boatmen of his era, including Charles Russell, Julius Stone, Ellsworth Kolb, and others, were among the first people to navigate the Colorado River before the construction of Glen Canyon Dam and Navajo Dam.

<i>Facing Your Danger</i> 1946 film

Facing Your Danger is a 1946 American short film. The cameraman was amateur filmmaker Edwin E. Olsen. Using a Cine-Kodak and 16mm Kodachrome film, Olsen shot the film in 1942 on a Grand Canyon river trip conducted by Norman Nevills. Another amateur cameraman on the trip was Otis R. Marston. When Olsen ran out of film, Marston, who had brought 6,000 feet of Kodachrome magazines, provided Olsen with what he needed. Olsen edited the film and sold it to Warner Brothers in 1946. Lee Anthony and Gordon Hollingshead collaborated to re-edit and shorten the film to a one reel for theater release.

Diamond Creek is an intermittent stream that flows through the Hualapai tribal reservation generally north from Peach Springs, Arizona to the Colorado River.

Unkar Group

The Unkar Group is a sequence of strata of Proterozoic age that are subdivided into five geologic formations and exposed within the Grand Canyon, Arizona, Southwestern United States. It is about 1,600 to 2,200 m thick and composed, in ascending order, of the Bass Formation, Hakatai Shale, Shinumo Quartzite, Dox Formation, and Cardenas Basalt. It accumulated approximately between 1250 and 1104 Ma. In ascending order, the Unkar Group is overlain by the Nankoweap Formation, about 113 to 150 m thick; the Chuar Group, about 1,900 m (6,200 ft) thick; and the Sixtymile Formation, about 60 m (200 ft) thick. The Nankoweap and Sixtymile formations together with the Chuar and Unkar groups comprise the Grand Canyon Supergroup.

Nankoweap Formation

The Neoproterozoic Nankoweap Formation, is a thin sequence of distinctive red beds that consist of reddish brown and tan sandstones and subordinate siltstones and mudrocks that unconformably overlie basaltic lava flows of the Cardenas Basalt of the Unkar Group and underlie the sedimentary strata of the Galeros Formation of the Chuar Group. The Nankoweap Formation is slightly more than 100 m in thickness. It is informally subdivided into informal lower and upper members that are separated and enclosed by unconformities. Its lower (ferruginous) member is 0 to 15 m thick. The Grand Canyon Supergroup, of which the Nankoweap Formation is part, unconformably overlies deeply eroded granites, gneisses, pegmatites, and schists that comprise Vishnu Basement Rocks.

Grand Canyon Supergroup

The Grand Canyon Supergroup is a Mesoproterozoic to Neoproterozoic sequence of sedimentary strata, mostly exposed in the eastern Grand Canyon of Arizona. This group is composed of the Unkar Group, Nankoweap Formation, Chuar Group and the Sixtymile Formation, which overlie Vishnu Basement Rocks. Several notable landmarks of the Grand Canyon, such as the "Isis Temple and Cheops Pyramid" and the "Apollo Temple," are surface manifestations of the Grand Canyon Supergroup.

Tanner Graben mountain in United States of America

Located directly downstream of the Little Colorado River confluence with the Colorado River, the Tanner Graben, in the Grand Canyon, Arizona, USA is a prominence and cliffside rock formation below the East Rim. Tanner Graben is located riverside, on the Colorado River, on a north-northwest bank at Mile 68.5, and lies opposite Tanner Canyon. The Tanner Rapid, created by Tanner Creek lies at the riverside foot of the graben. The graben is a pronounced feature because of the black Cardenas Basalt that forms the middle section of the graben, presumably free of debris accumulation by its cliff face steepness, and winds, and airflow drainage that course through the Colorado River's canyons; unprotected side canyons of Cardenas Basalt show accumulations as a slope-forming geologic unit, with little showing of black basalt.

Robert Brewster Stanton American civil engineer

Robert Brewster Stanton was a United States civil and mining engineer. He was chief engineer of an expedition investigating the Grand Canyon for a possible railroad line in 1889-90, and investigated many mining properties.

Bass Formation lithostratigraphic unit

The Bass Formation, also known as the Bass Limestone, is a Mesoproterozoic rock formation that outcrops in the eastern Grand Canyon, Coconino County, Arizona. The Bass Formation erodes as either cliffs or stair-stepped cliffs. In the case of the stair-stepped topography, resistant dolomite layers form risers and argillite layers form steep treads. In general, the Bass Formation and associated strata of the Unkar Group rocks dip northeast (10°-30°) toward normal faults that dip 60+° toward the southwest. This can be seen at the Palisades fault in the eastern part of the main Unkar Group outcrop area. In addition, thick, prominent, and dark-colored basaltic sills intrude across the Bass Formation.

Mary Ogden Abbott

Mary Ogden Abbott was an American wood carving and line drawing artist, world traveler, equestrian and an early Grand Canyon River runner.

Otis R. Marston American river runner

Otis Reed "Dock" Marston was an American author, historian, and Grand Canyon river runner who participated in a large number of river-running firsts. Marston was the eighty-third person to successfully complete the water transit of the Grand Canyon. He spent the last thirty years of his life writing his magnum opus on the history of the first 100 Grand Canyon river runners. In researching his book, he amassed a vast collection of material on early river runners in the American Southwest, especially runners of the Green and Colorado Rivers. His collection is housed in the Huntington Library in San Marino, California.

Elzada Clover American botanist

Elzada Clover (1897–1980) was an American botanist who was the first to catalog plant life in the Grand Canyon on the Colorado River. She and Lois Jotter became the first two women to raft the entire length of the Grand Canyon.

References

  1. Marston, Otis R., (2014). "From Powell To Power; A Recounting of the First One Hundred River Runners Through the Grand Canyon. Flagstaff, Arizona: Vishnu Temple Press, p. 130 ISBN   978-0990527022
  2. Marston, Otis R., (2014). "From Powell To Power; A Recounting of the First One Hundred River Runners Through the Grand Canyon. Flagstaff, Arizona: Vishnu Temple Press, p. 454 ISBN   978-0990527022
  3. Marston, Otis R., (2014). "From Powell To Power; A Recounting of the First One Hundred River Runners Through the Grand Canyon. Flagstaff, Arizona: Vishnu Temple Press, p. 132 ISBN   978-0990527022
  4. Marston, Otis R., (2014). "From Powell To Power; A Recounting of the First One Hundred River Runners Through the Grand Canyon. Flagstaff, Arizona: Vishnu Temple Press, p. 182 ISBN   978-0990527022
  5. Marston, Otis R., (2014). "From Powell To Power; A Recounting of the First One Hundred River Runners Through the Grand Canyon. Flagstaff, Arizona: Vishnu Temple Press, p. 325 ISBN   978-0990527022
  6. Lucas, Joel (February 10, 2016). "The Drought Has Created New Gnarly Rapids in the Grand Canyon". Outside . Retrieved November 26, 2016.

Sources

International Standard Book Number Unique numeric book identifier

The International Standard Book Number (ISBN) is a numeric commercial book identifier which is intended to be unique. Publishers purchase ISBNs from an affiliate of the International ISBN Agency.