Mojave Desert basins

Mojave Desert basins
Name	Mojave Desert basins
Location	Southwestern United States
Country	United States
States	California; Nevada; Arizona; Utah
Region	Basin and Range Province

Mojave Desert basins are a series of closed drainage depressions in the southwestern United States characterized by arid basins, salt flats, and episodic playas. These basins occur within the broader Basin and Range Province and Intermontane Plateaus and are bounded by mountain ranges, fault systems, and ecoregions that include prominent deserts and wilderness areas. The basins influence patterns of biogeography, hydrology, and human use across multiple counties, national preserves, and military ranges.

Geography and boundaries

The basins lie within a matrix of physiographic regions that include the Death Valley National Park, Mojave National Preserve, Colorado Desert, Great Basin, San Bernardino County, Los Angeles County, Clark County, Nevada, and Inyo County, California. Major bounding ranges and features include the Sierra Nevada, San Gabriel Mountains, San Bernardino Mountains, Mojave Desert, Spring Mountains, Panamint Range, Orocopia Mountains, and the Transverse Ranges. Political and administrative borders overlap with jurisdictions such as the Bureau of Land Management, National Park Service, United States Fish and Wildlife Service, California Department of Fish and Wildlife, and tribal lands including the Chemehuevi Tribe and Fort Mojave Indian Tribe. Transportation corridors crossing basins include Interstate 15, U.S. Route 395, California State Route 14, and U.S. Route 95.

Geology and formation

Basins formed during Cenozoic extension associated with the Basin and Range Province and the interplay of the San Andreas Fault system and regional strike-slip deformation related to the Pacific Plate and North American Plate boundary. Tectonic processes tied to the Mojave block, Walker Lane, and episodes recorded in the Pliocene and Pleistocene produced grabens, half-grabens, and alluvial fans adjacent to ranges like the Muddy Mountains and the Black Mountains (California). Volcanism and plutonism associated with the Bitterroot Range and regional igneous centers influenced localized stratigraphy, while Paleozoic and Mesozoic sedimentary sequences including formations correlated to the Mojave Desert stratigraphic columns host evaporites and playa deposits. Faulting evidence is exposed at sites studied by researchers from institutions such as the United States Geological Survey, California Institute of Technology, University of California, Los Angeles, and University of Nevada, Las Vegas.

Hydrology and playas

Hydrologic systems are internally drained, producing terminal lakes and playas such as Dry Lake (Nevada), Silver Lake (California), and small, ephemeral basins in the Mojave River watershed and endorheic basins fed by runoff from ranges like the San Bernardino Mountains. Pleistocene pluvial lakes such as Lake Manly and ancient shorelines record wetter climates during the Last Glacial Maximum, with paleohydrology investigated by teams from Scripps Institution of Oceanography and the Desert Research Institute. Groundwater is hosted in alluvial aquifers exploited by municipal systems in places like Barstow, California, Baker, California, and Las Vegas Valley, and regulated under statutes administered by entities including the Nevada Division of Water Resources and the California State Water Resources Control Board. Playas concentrate salts and minerals; industrial and scientific interest links to resources referenced by the U.S. Geological Survey Mineral Resources Program.

Ecology and habitats

Basins support desert scrub, creosote bush scrub, saltbush scrub, and alkali sink habitats that connect to communities in the Joshua Tree National Park, Death Valley National Park, and Sequoia National Forest transition zones. Fauna include populations of desert tortoise (Gopherus agassizii), kit fox, bighorn sheep, Mojave fringe-toed lizard, and migratory birds using wet playas and riparian corridors near springs and seeps. Vegetation assemblages and pollinator networks have been the subject of studies by the Smithsonian Institution, California Academy of Sciences, National Audubon Society, and local universities. Threatened and listed species are managed under the Endangered Species Act by the U.S. Fish and Wildlife Service and state agencies, with recovery plans addressing habitat fragmentation from infrastructure and invasive plants like Tamarix.

Human history and cultural significance

Indigenous occupation by peoples including the Serrano, Chemehuevi, Cahuilla, Kawaiisu, and Mojave (tribe) predates Euro-American exploration; archaeological sites, petroglyphs, and trade routes connect to the Mohave Trail, Old Spanish Trail, and Mojave Road. 19th-century events include expeditions by figures associated with the California Gold Rush and military surveys tied to the United States Army and the Bureau of Indian Affairs. Mining booms brought communities and claims near the Mojave Desert basins, with historical towns such as Randsburg, California and Calico, California. In the 20th century, federal designations—Mojave National Preserve, Fort Irwin National Training Center, and military test ranges—altered land use, while cultural conservation involves museums like the Autry Museum of the American West and archives at the Bancroft Library.

Land use, management, and conservation

Land ownership includes federal, state, county, municipal, tribal, and private parcels overseen by agencies such as the Bureau of Land Management, National Park Service, U.S. Fish and Wildlife Service, and California State Parks. Management issues involve renewable energy projects connected to developers and programs supported by the Department of Energy, military training impacts near Nellis Air Force Base and Fort Irwin, and conservation strategies advocated by organizations including the Nature Conservancy, Sierra Club, Defenders of Wildlife, and regional land trusts. Protected designations include national monuments, wilderness areas nominated under the Wilderness Act, and candidate critical habitat under the Endangered Species Act. Collaborative planning involves stakeholders such as county governments, utilities like Southern California Edison, and transportation authorities.

Notable basins and subregions

Prominent subregions and basins include Death Valley, Eldorado Valley, Ivanpah Valley, Silver Lake (California), Owens Valley, Panamint Valley, Mojave River Basin, Cadiz Basin, Searles Valley, Fort Irwin Basin, Amargosa Valley, and smaller depressions mapped by the U.S. Geological Survey. Research sites and observational stations operated by institutions such as the Desert Studies Consortium, University of California Riverside, and California State University, San Bernardino support long-term monitoring.

Category:Deserts of the United States