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| Long Valley | |
|---|---|
| Name | Long Valley |
| Location | Sierra Nevada, California, United States |
| Elevation | 2100–2400 m |
| Length | 30 km |
| Width | 5–10 km |
| Type | Graben valley |
| Formed | Basin and Range extension, volcanism |
Long Valley is a high-elevation intermontane basin in eastern Sierra Nevada and western Great Basin region of eastern California, United States. The valley occupies a broad graben bounded by the Inyo Mountains, White Mountains, and Sierra Nevada crest, and lies adjacent to the Cathedral Range, Mammoth Mountain, and Devils Postpile National Monument. Long Valley is notable for its volcanic history, geothermal activity, and proximity to Yosemite National Park, Sequoia National Park, and the John Muir Trail corridor.
Long Valley sits within eastern Mono County near the town of Mammoth Lakes and the community of Crowley Lake, extending toward Benton and Bridgeport. The valley floor borders U.S. Route 395, providing a corridor between Reno and Los Angeles via the Sierra Nevada passes. Topographic features include the Glass Mountains, the Hot Creek canyon, and numerous glacially carved moraines linked to the Last Glacial Maximum. Hydrologic drains feed Owens River, Mono Lake, and the Owens Lake watershed, while irrigation and reservoir systems connect with Crowley Lake Reservoir and historic Los Angeles Aqueduct diversions.
Long Valley occupies the Long Valley Caldera, a large collapse structure formed ~760,000 years ago during the eruption that created the Bishop Tuff. The caldera and surrounding terrain record Pleistocene and Holocene volcanism including the eruption of the Inyo Craters and construction of Mammoth Mountain. Modern unrest has produced uplift episodes measured by InSAR, GPS, and earthquake swarms cataloged by the United States Geological Survey. Hydrothermal manifestations such as fumaroles, hot springs, and gas emissions occur at Hot Creek, Mono-Inyo Craters, and in areas monitored by the California Volcano Observatory. Regional tectonics reflect Basin and Range Province extension and interactions with the Walker Lane belt and the San Andreas Fault system.
Indigenous peoples including the Mono people and the Paiute peoples occupied valleys and passes, hunting and trading along routes connecting to Yosemite Valley, Owens Valley, and the Great Basin. Euro-American exploration involved John C. Fremont expeditions and later California Gold Rush migrants moving east-west across the Sierra Nevada. The area developed through 19th- and 20th-century mining around Bodie and pastoral ranching linked to Los Angeles Department of Water and Power water projects. Timber extraction, railroad surveys by Southern Pacific Railroad, and the rise of Mammoth Lakes as a resort influenced settlement, while federal actions by the National Park Service and the Bureau of Land Management shaped land status.
Long Valley's montane and subalpine zones host flora such as Jeffrey pine, Lodgepole pine, and meadows supporting species recorded in Inyo National Forest inventories; fauna include Mule deer, California bighorn sheep, and Sierra Nevada red fox populations monitored by wildlife agencies. Alpine wetlands and sagebrush steppe habitats link to migratory pathways used by birds cataloged by the Audubon Society and researchers from UC Berkeley and UC Davis. The climate is characterized by cold snowy winters and warm dry summers influenced by Pacific storm track variability, ENSO phases, and recent trends assessed by climate scientists at NASA and the National Oceanic and Atmospheric Administration.
Long Valley is a hub for outdoor recreation centered on Mammoth Mountain Ski Area, alpine trailheads for the John Muir Trail and Pacific Crest Trail, and attractions such as Devils Postpile National Monument and Yosemite National Park gateway routes. Activities include skiing, mountaineering, fishing in Crowley Lake Reservoir and high alpine lakes, rock climbing near Red Slate Mountain, and scenic driving along U.S. Route 395. Tourism infrastructure is supported by operators like Mammoth Mountain Ski Area companies, regional accommodations, and conservation partnerships involving The Nature Conservancy and local chambers of commerce.
Land management involves multiple agencies including the Inyo National Forest, Bureau of Land Management, and California Department of Fish and Wildlife, balancing recreation, grazing permits, timber management, and geothermal leasing overseen by the U.S. Forest Service and federal energy regulators. Conservation initiatives target rare habitats, watershed protection for Mono Lake and Owens River restoration projects coordinated with the National Audubon Society and state water boards following litigation involving the Los Angeles Department of Water and Power. Scientific research by institutions like Stanford University and Scripps Institution of Oceanography informs mitigation of volcanic hazards and geothermal development.
Major transportation routes include U.S. Route 395 and access roads to Tioga Pass, linking to Yosemite National Park/Tioga Road corridors and providing freight and tourist access between Reno and Los Angeles. Infrastructure consists of water storage at Crowley Lake Reservoir, geothermal facilities near Casa Diablo, and emergency monitoring networks maintained by the United States Geological Survey and state emergency services including the California Governor's Office of Emergency Services. Aviation access is available via Mammoth Yosemite Airport, while utilities and broadband projects engage state agencies and private firms such as Pacific Gas and Electric Company for grid service.
Category:Valleys of California Category:Mono County, California