Cataract Canyon

Cataract Canyon is a formidable 74-kilometer (46-mile) stretch of the Colorado River situated in southern Utah, traversing both Canyonlands National Park and Glen Canyon National Recreation Area. Its dramatic landscape is carved into the vast Colorado Plateau, a region significantly uplifted millions of years ago. The canyon begins at the confluence of the Green and Colorado Rivers and concludes at its junction with the Dirty Devil River. A significant characteristic of Cataract Canyon is that its lower half becomes submerged beneath the waters of Lake Powell when the lake reaches its normal high water elevation of 1,100 meters (3,700 feet).

Geology

The geological narrative of Cataract Canyon is deeply intertwined with the history of the Colorado Plateau. This plateau, a substantial continental uplift in the American Southwest, was once near sea level up until approximately 80 million years ago. Over eons, a cycle of transgressing and regressing inland seas deposited horizontal layers of rock. A pivotal event was the Laramide orogeny, a series of mountain-building episodes occurring 70 to 80 million years ago, which elevated the entire region. Subsequently, the Colorado River began its erosive work, cutting through these rock strata and exposing their ancient layers. The oldest rock formation visible within Cataract Canyon is the Paradox Formation, which dates back an estimated 320 million years.

History and Exploration

Evidence suggests that indigenous peoples, most likely from the Fremont culture, inhabited the Canyonlands region long before the arrival of European settlers. Within Cataract Canyon, rock art and ancient ruins dating back at least 800 years have been discovered, attesting to this early human presence. Due to its remote and challenging terrain, European explorers and settlers were slow to reach the area, viewing the Colorado River and its canyons more as obstacles than as destinations for exploration. The first European documented to reach Cataract Canyon was fur trapper Denis Julien in 1836; his carved inscription is now lost beneath Lake Powell.

The year 1869 marked the first organized exploration of the canyon's entire length by the Powell Expedition, led by John Wesley Powell. This expedition navigated wooden boats from Wyoming down the Green River to its confluence with the Colorado River, at the head of Cataract Canyon. The powerful rapids of Cataract Canyon presented a significant challenge, forcing Powell and his crew to portage their boats around each rapid, a strenuous undertaking. It was the intensity of these rapids that led Powell to name the canyon "Cataract Canyon." Following their passage through Cataract, Powell's expedition continued downstream through Glen Canyon (now inundated by Lake Powell) and ultimately the Grand Canyon.

Following Powell, other river runners ventured through the canyon. Nathanial Galloway made multiple trips in 1894, later pioneering rowing techniques still in use. The Kolb brothers, Emery and Ellsworth, traversed the canyon in 1911, eventually establishing a studio at the Grand Canyon's South Rim to showcase their exploits. Buzz Holmstrom completed a solo journey in 1937, ending at the Hoover Dam. The first commercial outfitter, Norman Nevills, began offering trips in 1938. The introduction of surplus World War II rubber rafts in the early 1950s revolutionized river running, making navigation easier and more forgiving, which led to a surge in commercial expeditions through Cataract Canyon and the Grand Canyon.

Whitewater Rafting

Cataract Canyon continues to be a premier destination for whitewater rafting, renowned for its "big water" rapids that share characteristics with those found in the Grand Canyon. The canyon's rapids are rated on the Class I-VI International Scale of River Difficulty. A key factor distinguishing Cataract Canyon from the Grand Canyon is the largely unregulated flow of the Colorado River through it, being downstream from any major dam. This can lead to extreme water levels during the spring runoff, particularly following winters with substantial snowpack throughout the Colorado River watershed. During an average spring runoff, the river can peak around 1,500 cubic feet per second (1,500 m³/s), though a record flow of 114,900 cu ft/s (3,250 m³/s) was recorded on May 27, 1984. The rapids become challenging at flows above 30,000 cu ft/s (850 m³/s) and are considered extreme above 50,000 cu ft/s (1,400 m³/s).

While many rapids are sequentially numbered, some possess distinct names due to their location or notoriety. The "Big Drops" are a particularly infamous set of three rapids close together, which during high water, effectively merge into a single, massive rapid. This section features formidable hydraulic features such as "Little Niagara," "Satan's Gut," and "The Claw." During periods of high runoff, the National Park Service may establish a riverside camp below the Big Drops to assist with rescues of capsized rafts. However, it is generally expected that all river runners attempting Cataract Canyon, regardless of water level, should possess the capability for self-rescue and not rely on NPS support.

Historically, Cataract Canyon contained other notable rapids like "Gypsum Canyon Rapid" and "Dark Canyon Rapid," which are now submerged under Lake Powell and buried in sediment. River trips traversing Cataract Canyon typically begin with flatwater sections above the Green and Colorado River confluence. Most groups launch from Potash or Mineral Bottom, spending up to five days on the river before entering the canyon. Motorized trips can cover this initial distance in a single day. Regardless of the watercraft, all groups must navigate across Lake Powell to reach their take-out point, often at the Dirty Devil River or Hite Marina. Depending on the lake's water level, this final segment can extend up to 56 kilometers (35 miles) of flatwater.

Several commercial outfitters provide guided excursions through Cataract Canyon, with trip durations ranging from one to six days and employing both motorized and non-motorized boats. Private groups are required to obtain a permit from the National Park Service before commencing their journey.