Great Basin

Great Basin
Region
Relief Map with Great Basin Overlay
Countries	United States, Mexico
Coordinates
Highest point	Mount Whitney summit
- location	Sierra Nevada
- elevation	14,505 ft (4,421.1 m)
- coordinates
Lowest point	Badwater Basin
- location	Death Valley
- elevation	-279 ft (-85 m)
- coordinates
Area	209,162 sq mi (541,727 km2) GIS files used for both the acreage calculations and the overlay of the above map.
- persistent water (average area)	4,079 sq mi (10,565 km2)
Geology	Basin and Range Province
GNIS code	2087988

The Great Basin is the largest area of contiguous endorheic watersheds in North America. It is noted for both its arid climate and the basin and range topography that varies from the North American low point at Badwater Basin to the highest point of the contiguous United States, less than 100 miles (160 km) away at the summit of Mount Whitney. The region spans several physiographic divisions, biomes/ecoregions, and deserts.

Definition

The hydrographic Great Basin (magenta outline), distinguished from the Great Basin Desert (black), and the Basin and Range Geological Province (teal).

The term "Great Basin" is applied to hydrographic, biological, floristic, physiographic, topographic, and ethnographic geographic areas. The name was originally coined by John C. Frémont who, with information gleaned from Joseph R. Walker as well as his own travels, recognized the hydrographic nature of the landform as "having no connection to the ocean". The hydrographic definition is the most commonly used, and is the only one with a definitive border. The other definitions not only yield different geographical boundaries of "Great Basin" regions, but regional borders that vary from source to source.

The Great Basin Desert is defined by plant and animal communities, and, according to the National Park Service, its boundaries approximate the hydrographic Great Basin, but excludes the southern "panhandle".

The Great Basin Floristic Province was defined by Takhtajan to extend well beyond the boundaries of the hydrographically defined Great Basin: it includes the Snake River Plain, the Colorado Plateau, the Uinta Basin, and parts of Arizona north of the Mogollon Rim.

The Great Basin physiographic section is a geographic division of the Basin and Range Province defined by Nevin Fenneman in 1931. The United States Geological Survey adapted Fenneman's scheme in their Physiographic division of the United States. The "section" is somewhat larger than the hydrographic definition.

The Great Basin Culture Area or Indigenous peoples of the Great Basin is a cultural classification of indigenous peoples of the Americas and a cultural region located between the Rocky Mountains and the Sierra Nevada. The culture area covers approximately 400,000 sq mi (1,000,000 km²), or just less than twice the size of the hydrographic Great Basin.

Hydrology

The Tule Valley watershed and the House Range (Notch Peak) are part of the Great Basin's Great Salt Lake hydrologic unit

For the subdivisions and major waterways of the Great Basin, see List of Great Basin watersheds and List of rivers of the Great Basin.

The hydrographic Great Basin is a 209,162 square miles (541,730 km²) area that drains internally. All precipitation in the region evaporates, sinks underground or flows into lakes (mostly saline). As observed by Fremont, creeks, streams, or rivers find no outlet to either the Gulf of Mexico or the Pacific Ocean. The region is bounded by the Wasatch Mountains to the east, the Sierra Nevada and Cascade Ranges to the west, and the Snake River Basin to the north. The south rim is less distinct. The Great Basin includes most of Nevada, half of Utah, substantial portions of Oregon and California and small areas of Idaho and Wyoming. The term "Great Basin" is slightly misleading; the region is actually made up of many small basins. The Great Salt Lake, Pyramid Lake, and the Humboldt Sink are a few of the "drains" in the Great Basin. The Salton Sink is another closed basin within the Great Basin.

The Great Basin Divide separates the Great Basin from the watersheds draining to the Pacific Ocean. The southernmost portion of the Great Basin is the watershed area of the Laguna Salada. The Great Basin's longest and largest river is the Bear River of 350 mi (560 km), and the largest single watershed is the Humboldt River drainage of roughly 17,000 sq mi (44,000 km²). Most Great Basin precipitation is snow, and the precipitation that neither evaporates nor is extracted for human use will sink into groundwater aquifers, while evaporation of collected water occurs from geographic sinks. Lake Tahoe, North America's largest alpine lake, is part of the Great Basin's central Lahontan subregion.

Ecology

Main articles: Great Basin Desert and Mojave Desert

Ecoregions as currently delineated by the Environmental Protection Agency and World Wildlife Fund

The hydrographic Great Basin contains multiple deserts and ecoregions, each with its own distinctive set of flora and fauna. The ecological boundaries and divisions in the Great Basin are unclear.

The Great Basin overlaps four different deserts: portions of the hot Mojave and Colorado (a region within the Sonoran desert) Deserts to the south, and the cold Great Basin and Oregon High Deserts in the north. The deserts can be distinguished by their plants: the Joshua tree and creosote bush occur in the hot deserts, while the cold deserts have neither. The cold deserts are generally higher than the hot, and have their precipitation spread throughout the year.

The climate and flora of the Great Basin is strongly dependent on elevation: as the elevation increases, the precipitation increases and temperature decreases. Because of this, forests occur at higher elevations. Utah juniper/single-leaf pinyon (southern regions) and mountain mahogany (northern regions) form open pinyon-juniper woodland on the slopes of most ranges. Stands of limber pine and Great Basin bristlecone pine (Pinus longaeva) can be found in some of the higher ranges. In riparian areas with dependable water cottonwoods (Populus fremontii) and quaking aspen (Populus tremuloides) groves exist.

Because the forest ecosystem is distinct from a typical desert, some authorities, such as the World Wildlife Fund, separate the mountains of the Great Basin desert into their own ecoregion: the Great Basin montane forests. Many rare and endemic species occur in this ecoregion, because the individual mountain ranges are isolated from each other. During the last ice age, the Great Basin was wetter. As it dried during the Holocene, some species retreated to the higher isolated mountains and have high genetic diversity

Other authorities divide the Great Basin into different ecoregions, depending on their own criteria. Armen Takhtajan defined the "Great Basin floristic province". The U.S. Environmental Protection Agency divides the Great Basin into three ecoregions roughly according to latitude: the Northern Basin and Range ecoregion, the Central Basin and Range ecoregion, and the Mojave Basin and Range ecoregion.

Great Basin snowstorm in the Snake Valley of Utah and Nevada

Fauna

Great Basin wildlife includes pronghorn, mule deer, mountain lion, and lagomorphs such as black-tailed jackrabbit and desert cottontail and the coyotes that prey on them. Packrats, kangaroo rats and other small rodents are also common, and are predominantly nocturnal. Elk and bighorn sheep are present but uncommon. Small lizards such as the Great Basin fence lizard, longnose leopard lizard and horned lizard are common, especially in lower elevations. Rattlesnakes and gopher snakes are also present. The Inyo Mountains salamander is endangered. Shorebirds such as phalaropes and curlews can be found in wet areas. American white pelicans are common at Pyramid Lake. Golden eagles are also very common in the Great Basin. Mourning dove, western meadowlark, black-billed magpie, and common raven are other common bird species.

Two endangered species of fish are found in Pyramid Lake: the Cui-ui sucker fish (endangered 1967) and the Lahontan cutthroat trout (threatened 1970).

Large invertebrates include tarantulas (Aphonopelma genus) and Mormon crickets. Exotic species, including chukar, grey partridge, and Himalayan snowcock, have been successfully introduced to the Great Basin, although the latter has only thrived in the Ruby Mountains. Cheatgrass, an invasive species which was unintentionally introduced, forms a critical portion of their diets. Feral horses (mustangs) and wild burros are other highly reproductive, and ecosystem-controversial, alien species. Most of the Great Basin is open range and domestic cattle and sheep are widespread.

Geography

Basin and Range topography as seen from the air

The Great Basin includes valleys, basins, lakes and mountain ranges of the Basin and Range Province. Geographic features near the Great Basin include the Continental Divide of the Americas, the Great Divide Basin, and the Gulf of California.

Map showing the Great Basin physiographic section (shown as 22a)

Great Basin physiographic section

The Great Basin physiographic section of the Basin and Range Province contains the Great Basin, but extends into eastern Oregon, southern Idaho, and the Colorado River watershed (including the Las Vegas metropolitan area and northwest corner of Arizona). The Basin and Range region is the product of geological forces stretching the earth's crust, creating many north-south trending mountain ranges. These ranges are separated by flat valleys or basins. These hundreds of ranges make Nevada the most mountainous state in the country.

Settlements and roads

The Great Basin's two most populous metropolitan areas are the Reno-Sparks metropolitan area to the west and Wasatch Front to the east. The region between these two areas is sparsely populated, but includes the smaller cities of Elko, Ely, Wendover, West Wendover, and Winnemucca. To the north are; in California Susanville, in Oregon Burns and Hines, in Idaho Malad and in Wyoming Evanston. To the south are Cedar City, Tonopah, and Bishop and the very southern area of the basin has the communities of Pahrump Palmdale, Victorville, and Palm Springs. Interstate highways traversing the Great Basin are 80 and 15, and Interstates 70 and 84; have their respective beginning and terminus within its boundaries. Other major roadways are U.S. Route 6, U.S. Route 50, U.S. Route 93, U.S. Route 95 and U.S. Route 395. The section of U.S. Route 50 between Delta, Utah and Fallon, Nevada is nicknamed "The Loneliest Road in America" and Nevada State Route 375 is designated the "Extraterrestrial Highway.". The Great Basin is traversed by several rail lines including the Union Pacific Railroad's Overland Route (Union Pacific Railroad) through Reno and Ogden, Feather River Route, Central Corridor and Los Angeles and Salt Lake Railroad.

History

Sediment build-up over thousands of years filled the down-faulted basins between ranges and created relatively flat lacustrine plains from Pleistocene lake beds of the Great Basin. For example, after forming about 32,000 years ago, Lake Bonneville overflowed about 14,500 years ago in the Bonneville Flood through Red Rock Pass and lowered to the "Provo Lake" level (the Great Salt Lake, Utah Lake, Sevier Lake, Rush Lake, and Little Salt Lake remain). Lake Lahontan, Lake Manly, and Lake Mojave were similar Pleistocene lakes.

Native American tribes that inhabited the Great Basin were divided between the "Great Basin" and, in the Colorado desert region, the "California" tribal classifications.

Paleo-Indian habitation by the Great Basin tribes began as early as 10,000 B.C. (the Numic-speaking Shoshonean peoples arrived as late as 1000 A.D.). Archaeological evidence of habitation sites along the shore of Lake Lahontan date from the end of the ice age when its shoreline was approximately 500 feet (150 m) higher along the sides of the surrounding mountains. The Great Basin was inhabited for at least several thousand years by Uto-Aztecan language group-speaking Native American Great Basin tribes, including the Shoshone, Ute, Mono, and Northern Paiute.

European exploration of the Great Basin occurred during the 18th century Spanish colonization of the Americas. The first immigrant American to cross the Great Basin from the Sierra Nevada was Jedediah Strong Smith in 1827. Peter Skene Ogden of the British Hudson's Bay Company explored the Great Salt Lake and Humboldt River regions in the late 1820s, following the eastern side of the Sierra Nevada to the Gulf of California. Benjamin Bonneville explored the northeast portion during an 1832 expedition. The United States had acquired control of the area north of the 42nd parallel via the 1819 Adams–Onís Treaty with Spain and 1846 Oregon Treaty with Britain. The US gained control of most of the rest of the Great Basin via the 1848 Mexican Cession. The first non-indigenous settlement was in 1847 in the Great Salt Lake Valley, leading to first American religious settlement effort of the Mormon provisional State of Deseret in 1849 in present-day Utah and northern Nevada. Later settlements were connected with the eastern regions of the 1848 California Gold Rush, with its immigrants crossing the Great Basin on the California Trail along Nevada's Humboldt River to Carson Pass in the Sierras. The Oregon Territory was established in 1848 and the Utah Territory in 1850.

In 1869 the First Transcontinental Railroad was completed at Promontory Summit in the Great Basin. Around 1902, the San Pedro, Los Angeles and Salt Lake Railroad was constructed in the lower basin and Mojave Desert for California-Nevada rail service to Las Vegas, Nevada.

To close a 1951 Indian Claims Commission case, the Western Shoshone Claims Distribution Act of 2004 established the United States payment of $117 million to the Great Basin tribe for the acquisition of 39,000 square miles (100,000 km²).

The Dixie Valley, Nevada, earthquake (6.6-7.1) in the Great Basin was in 1954.

Climate

Wah Wah Valley, Utah, thunderstorm

For more detail of Great Basin climate, see Great Basin Desert § Climate, and Mojave Desert § Climate.

Climate varies throughout the Great Basin by elevation, latitude, and other factors. Higher elevations tend to be cooler and receive more precipitation. The western areas of the basin tend to be drier than the eastern areas because of the rain shadow of the Sierra Nevada. Most of the basin experiences a semi-arid or arid climate with warm summers and cold winters. However, some of the mountainous areas in the basin are high enough in elevation to experience an Alpine climate. Due to the region's altitude and aridity, most areas in the Great Basin experience a substantial Diurnal temperature variation.

Significant special designations

• Great Basin National Park: President Warren G. Harding created Lehman Caves National Monument by presidential proclamation on January 24, 1922. It was incorporated into the national park on October 27, 1986.
• Death Valley National Park: Death Valley National Monument was designated in 1933 and the park was substantially expanded and became a national park in 1994.
• Joshua Tree National Park was initially created as a National Monument on 10 August 1936, containing 825,000 acres (334,000 ha), after Minerva Hoyt led activism aimed at persuading the state and federal governments at protecting the area. The park was elevated to a National Park on 31 October 1994 by the Desert Protection Act, which also added 234,000 acres to the park.
• The Golden Spike National Historic Site as authorized as a National Historic Site on April 2, 1957 under non-federal ownership. It was authorized for federal ownership and administration by an act of Congress on July 30, 1965.
• The Juan Bautista de Anza National Historic Trail was designated in 1990.
• The Pony Express and California National Historic Trails were designated in 1992.
• The Mojave National Preserve was established October 31, 1994 with the passage of the California Desert Protection Act by the US Congress.
• The Black Rock Desert–High Rock Canyon Emigrant Trails National Conservation Area was created by the Black Rock Desert–High Rock Canyon Emigrant Trails National Conservation Area Act of 2000.
• The Old Spanish National Historic Trail was designated in 2002.
• The Great Basin National Heritage Area was designated on October 13, 2006 under P.L.109-338
• A section of the Amargosa River was a designated Wild and Scenic River in 2009 and is also a Bureau of Land Management Natural Area.
• The Basin and Range National Monument was designated on July 9, 2015 under the authority of the Antiquities Act by President Barack Obama on the boundary of the Great Basin and Mojave Deserts, encompassing Garden and Coal Valleys in Southern Nevada.

See also

• Hidden Cave, an archaeological cave site located in the Great Basin
• Bonneville Salt Flats
• Hastings Cutoff
• Salton Sea

External links

• "Great Basin" from the Utah History Encyclopedia by Gary B. Peterson