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Black Canyon of the Gunnison National Park

Black Canyon of the Gunnison
IUCN category II (national park)
Gunnison River at the base of Black Canyon of the Gunnison
Map showing the location of Black Canyon of the Gunnison
Map showing the location of Black Canyon of the Gunnison
Location Montrose County, Colorado, United States
Nearest city Montrose
Coordinates
Area 30,750 acres (12,440 ha)[1]
Established October 21, 1999
Visitors 183,045 (in 2014)[2]
Governing body National Park Service

Black Canyon of the Gunnison National Park is a [3]

Contents

  • Geology 1
    • Precambrian 1.1
    • Cretaceous - Tertiary 1.2
    • Quaternary 1.3
  • History 2
  • Biology 3
  • Attractions 4
  • References 5
  • External links 6

Geology

Black Canyon of the Gunnison

The Gunnison River drops an average of 34 feet per mile (6.4 m/km) through the entire canyon, making it the 5th steepest mountain descent in North America. By comparison, the Colorado River drops an average of 7.5 feet per mile (1.42 m/km) through the Grand Canyon. The greatest descent of the Gunnison River occurs within the park at Chasm View dropping 240 feet per mile (45 m/km).[4] The Black Canyon is so named due its steepness which makes it difficult for sunlight to penetrate into its depths. As a result, the canyon is often shrouded in shadow, causing the rocky walls to appear black. At its narrowest point the canyon is only 40 ft (12 m) wide at the river.[4][5]

The extremely narrow walls of the canyon
Overview Black Canyon with Gunnison River

The extreme steepness and depth of the Black Canyon formed as the result of several geologic processes acting together. The Gunnison River is primarily responsible for carving the canyon, though several other geologic events had to occur in order to form the canyon as it is seen today.[6]

Painted Wall on the north side of the canyon. It is the tallest sheer cliff in Colorado at 2,250 feet (690 m). Lighter-colored pegmatite dikes are clearly visible.

Precambrian

The Precambrian gneiss and schist that make up the majority of the steep walls of the Black Canyon formed 1.7 billion years ago during a metamorphic period brought on by the collision of ancient volcanic island arcs with the southern end of what is present-day Wyoming. The lighter-colored pegmatite dikes that can be seen crosscutting the basement rocks formed later during this same period.[7]

Cretaceous - Tertiary

The entire area underwent uplift during the Laramide orogeny between 70 and 40 million years ago which was also part of the Gunnison Uplift. This raised the Precambrian gneiss and schist that makes up the canyon walls. During the Tertiary from 26 to 35 million years ago large episodes of volcanism occurred in the area immediately surrounding the present day Black Canyon. The West Elk Mountains, La Sal Mountains, Henry Mountains, and Abajo Mountains all contributed to burying the area in several thousand feet of volcanic ash and debris.[8]

The modern Gunnison River set its course 15 million years ago as the run-off from the nearby La Sal and West Elk Mountains and the Sawatch Range began carving through the relatively soft volcanic deposits.[8]

Quaternary

With the Gunnison River’s course set, a broad uplift in the area 2 to 3 million years ago caused the river to cut through the softer volcanic deposits. Eventually the river reached the Precambrian rocks of the Gunnison Uplift. Since the river was unable to change its course, it began scouring through the extremely hard metamorphic rocks of the Gunnison Uplift. The river’s flow was much larger than currently, with much higher levels of turbidity. As a result, the river dug down through the Precambrian gneiss and schist at the rate of 1-inch (25 mm) every 100 years. The extreme hardness of the metamorphic rock along with the relative quickness with which the river carved through them created the steep walls that can be seen today.[8]

A number of feeder canyons running into the Black Canyon slope in the wrong direction for water to flow into the canyon. It is believed that less-entrenched streams in the region shifted to a more north-flowing drainage pattern in response to a change in the tilt of the surrounding terrain. The west-flowing Gunnison, however, was essentially trapped in the hard Precambrian rock of the Black Canyon and could not change its course.[9]

History

The Ute Indians had known the canyon to exist for a long time before the first Europeans saw it. They referred to the river as "much rocks, big water," and are known to have avoided the canyon out of superstition.[3] By the time the United States declared independence in 1776, two Spanish expeditions had passed by the canyons. In the 1800s, the numerous fur trappers searching for beaver pelts would have known of the canyon's existence but they left no written record. The first official account of the Black Canyon was provided by Captain John Williams Gunnison in 1853, who was leading an expedition to survey a route from Saint Louis and San Francisco. He described the country to be "the roughest, most hilly and most cut up," he had ever seen, and skirted the canyon south towards present-day Montrose. Following his death at the hands of Ute Indians later that year, the river that Captain Gunnison had called the Grand was renamed in his honor.[10]

In 1881, William Jackson Palmer's

  • Black Canyon of the Gunnison National Park (National Park Service)
  • Geology and photo gallery of Black Canyon
  • Chicago Tribune - A slash in the mesa
  • , a symphonic poem which has been performed on the rim of the canyonBlack Canyon of the GunnisonFrank Erickson (1923–1996),

External links

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  22. ^ and accompanying photos
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  24. ^ Beatty, B.L., W.F. Jennings, and R.C. Rawlinson (2004, February 9). M.E. Jones (Black Canyon gilia): a technical conservation assessment.Gilia penstemonoides [Online]. USDA Forest Service, Rocky Mountain Region.
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References

Rafting opportunities exist in the region, but the run through the park itself is a difficult technical run for only the best kayakers. There are several impassable stretches of water requiring long, sometimes dangerous portages. The remaining rapids are class III - V, and are only for expert river runners.[29] Downstream, in the Gunnison Gorge National Conservation Area, the river is somewhat easier to navigate, though still very remote and only for experienced runners, with rapids that are Class III - IV.[30][31]

The Black Canyon is a center for rock climbing in a style known as traditional climbing. Most of the climbs are difficult and attempted only by advanced climbers.[28]

The Gunnison River is designated as a Gold Medal Water from 200 yards downstream of Crystal Reservoir Dam to the North Fork. This includes the 12 miles within the Black Canyon of the Gunnison National Park. Only artificial flies and lures are permitted, and all rainbow trout are catch and release. Additionally, fishing is prohibited within 200 yards downstream of Crystal Dam.[27]

The river can also be accessed by steep, unmaintained trails called routes or draws on the north and south rim. These routes require about two hours to hike down and two to four hours to hike back up, depending on which route is taken. All inner canyon descents are strenuous and require Class 3 climbing and basic route finding skills. Steep talus, impassable ledges, and lack of cover are some of the challenges hikers are faced with. Poison ivy also grows abundantly in the draws and on the canyon floor. Long sleeves and hiking boots are strongly recommended. The flow rate of the Gunnison River should also be considered for those planning on camping in the canyon, as high river levels can wash out the camp sites. The National Park Service warns the following: "Routes are difficult to follow, and only individuals in excellent physical condition should attempt these hikes ... Hikers are expected to find their own way and to be prepared for self-rescue."[26] A free back country permit is required for all inner canyon use except at the west end.

An estimated 250,000 tourists visit the park annually. The main attraction of the park is the scenic drive along US Highway 50 and Colorado Highway 92, as well as the south rim. The west end of the park, where it meet Blue Mesa Reservoir at Blue Mesa Point, is the area most developed for camping. It includes tent camping and RV parking with full hookups as well as canyon tours, hiking, fishing and boat tours. The west end of the park has river access by automobile, as well as guided tours of the canyon. A short hike at Blue Mesa Point Information Center heads down to Pine Creek and the Morrow Point boat tours, boating, fishing and hiking. At the south rim there are two campgrounds and several hiking and nature trails. The north rim is quite beautiful. It is also accessible by automobile and has a small, primitive campground. Automobiles can access the river via the East Portal Road at the south rim; this road has a 16% grade and is prohibited to vehicles over 22 feet (7 m) in length.

Attractions

The Black Canyon of the Gunnison National Park contains a wide variety of flora and fauna. Some common plants native to the park include aspen, Ponderosa pine, sagebrush, desert mahogany (Cercocarpus ledifolius), Utah juniper, gambel oak (scrub oak) and single-leaf ash.[23] The Black Canyon gilia (Aliciella penstemonoides) is a species of wildflower native to the park.[24] Wildlife in the park include the coyote, elk, magpie, eagle, and mule deer. In addition, the canyon is the home of a number of resident birds including the great horned owl, American dipper and Steller's jay as well as migratory birds such as the mountain bluebird, peregrine falcon, white-throated swift and canyon wren.[25]

Juniper tree near the top of the canyon
Great horned owl chicks nesting in the Rocky Mountains

Biology

The Black Canyon of the Gunnison was established as a U.S. National Monument on March 2, 1933. It became a National Park on October 21, 1999.[21] During 1933-35, the Civilian Conservation Corps built the North Rim Road to design by the National Park Service. This includes fives miles of roadway and five overlooks; it is listed on the U.S.National Register of Historic Places as a historic district.[22]

Construction on the tunnel began 4 years later, and was fraught with difficulties right from the onset. "Working conditions at the tunnel were difficult due to the high levels of carbon dioxide, excessive temperatures, humidity, water, mud, shale, sand, and a fractured fault zone...It took the tunneling crew almost one year to bore through 2000 feet of water-filled rock. The tunnel was driven through granite, quartzite, gneiss, and shale as well as layers of sandstone, coal, and limestone. Work on the Gunnison Tunnel was first done manually and by candlelight. One miner would hold the drill and rotate it while the second miner would use a sledgehammer to drive the drill into the rock. This work required strong, hard-working men. In spite of good pay and fringe benefits, most disliked the dangerous underground conditions and stayed an average of only 2 weeks." 26 men were killed during the 4 year undertaking. The tunnel was finally completed in 1909, stretching a distance of 5.8 miles and costing nearly 3 million dollars. At the time, the Gunnison Tunnel held the honor of being the world's longest irrigation tunnel. On September 23, President William Howard Taft dedicated the tunnel in Montrose.[19] The East Portal of the Gunnison Tunnel is accessible via East Portal Road which is on the South Rim of the canyon. Although the tunnel itself is not visible, the diversion dam can be seen from the campground.[20]

In 1901, the U.S. Geological Survey sent Abraham Lincoln Fellows and William Torrence into the canyon to look for a site to build a diversion tunnel bringing water to the Uncompahgre Valley, which was suffering from water shortages due to an influx of settlers into the area.[17] Torrence, a Montrose native and an expert mountaineer, had taken part in a failed expedition the previous year, and his experience proved valuable on his second excursion. He opted to bring a single rubber air mattress instead of the heavy wooden boats that had doomed his previous journey into the canyon. They entered the canyon on August 12 equipped with "only hunting knives, two silk lifeline ropes, and rubber bags to encase their instruments." After a harrowing 10 days braving rock falls, waterfalls, and 76 river crossings, they emerged from the canyon with a suitable tunnel site.[18]

By 1890, an alternate route through Glenwood Springs had been completed and the route through the Black Canyon, being more difficult to operate, lost importance for through trains. The route was finally abandoned in 1955.[16]

Heeding Bryant's advice, Palmer decided to route the railroad south of the canyon and in March 1883, it completed its connection to [15]

In the hopes of running the railroad through the rest of the Black Canyon, Palmer sent his top engineer Bryan Bryant on an inner canyon exploration. Bryant set off with a 12-man crew in December 1882 expecting to complete the survey in 20 days; he returned in 68. "Eight of the twelve-man crew left after a few days, terrified of the task in front of them. What the rest of the men saw was spectacular and had never been seen by another human." Bryant reported that the Black Canyon was impenetrable, and that it was impossible to build anything in its depths.[13]

On August 13, 1882, the first passenger train passed through the Black Canyon. The editor of the Gunnison Review-Press rode in one of the observation cars; he remarked that the canyon was "undoubtedly the largest and most rugged canon in the world traversed by the iron horse. We had often heard of the scenery of this canyon, but no one can have the faintest conception of its grandeur and magnificence until they have made a trip through it. It is a narrow gorge with walls of granite rising in some places to a height of thousands of feet…Throughout its entire length there is probably not a quarter of a mile of straight track on it. It is a serpentine road in every respect and the curves are frequent and sharp. In hundreds of places the walls of granite are perpendicular and in many places the road bed is blasted out in the side of the walls of rock which overhang the track." He went on to proclaim, "Another such a feat of railroad engineering probably can not be found in the world, and there is probably no section of Colorado or of the whole country where such a varied and interesting lot of scenery can be found."[12]

[11]

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