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| Caldor Fire | |
|---|---|
| Name | Caldor Fire |
| Location | Eldorado National Forest, El Dorado County, California, United States |
| Date | August–October 2021 |
| Area | 221,835 acres |
| Cause | under investigation (human-caused) |
| Buildings | 1,003+ structures destroyed |
Caldor Fire The Caldor Fire was a large wildfire that burned in the Eldorado National Forest, El Dorado County, California, during the 2021 California wildfires season. Igniting in August 2021 near Grizzly Flats, the fire threatened South Lake Tahoe, forced evacuations in Placerville and surrounding communities, and became a major incident for agencies including the United States Forest Service, Cal Fire, and the National Park Service.
The fire began amid a summer influenced by the 2021 Western United States heat wave, ongoing drought conditions tied to the California drought, and long-term trends identified by climate assessments such as the Fourth National Climate Assessment and reports from the Intergovernmental Panel on Climate Change. Vegetation conditions in Sierra Nevada mixed-conifer forests reflected decades of fire suppression noted in analyses by the U.S. Forest Service and studies published in journals like Science and Proceedings of the National Academy of Sciences. Investigations into ignition sources involved agencies including Cal Fire, the El Dorado County Sheriff's Office, and federal investigators coordinating with the U.S. Department of Agriculture.
The incident was reported in late August 2021 near the intersection of Highway 49 and Sly Park Road around Grizzly Flats. Rapid spread was driven by erratic winds from meteorological patterns tracked by the National Weather Service and regional forecasts from the Western Regional Climate Center. Fire behavior models used by the National Interagency Fire Center and simulations in software such as FARSITE informed decisions by incident commanders following the National Incident Management System. Over the following weeks the fire expanded across terrain in the Eldorado National Forest and toward the Lake Tahoe Basin, prompting large-scale evacuation orders coordinated with the California Office of Emergency Services and local jurisdictions including El Dorado County, California and the city of South Lake Tahoe.
The fire destroyed over 1,000 structures, affected communities such as Grizzly Flats, Pollock Pines, and neighborhoods near Tahoma, California on the western shore of Lake Tahoe, and disrupted transportation on highways including U.S. Route 50. Economic impacts involved businesses in tourism-dependent areas associated with entities like the Tahoe Regional Planning Agency and resorts managed by companies active in the Lake Tahoe region. Smoke from the conflagration contributed to regional air quality degradation measured by the Air Quality Index and monitored by agencies including the California Air Resources Board and local air districts such as the El Dorado County Air Quality Management District, with public health guidance issued by county health departments and the Centers for Disease Control and Prevention.
Suppression efforts involved multi-agency coordination among Cal Fire, the United States Forest Service, the National Park Service, the Federal Emergency Management Agency, and local fire districts such as the South Lake Tahoe Fire Department. Resource mobilization included crews from the Incident Management Team system, aerial assets managed under Aerial firefighting protocols, and logistics supported by the National Interagency Fire Center and the California Office of Emergency Services. Tactics combined direct and indirect line construction, backburns authorized under unified command structures, and use of dozers and hand crews guided by standards from the National Wildfire Coordinating Group. Evacuation orders and emergency shelters were activated through coordination with organizations like the American Red Cross and county emergency operations centers.
Burn severity patterns altered habitats across elevations in the Sierra Nevada range, impacting species documented by agencies such as the California Department of Fish and Wildlife and researchers from institutions including the University of California, Davis and University of California, Berkeley. Effects on soil stability raised concerns cited in studies by the U.S. Geological Survey, increasing risks of erosion and post-fire flooding in watersheds that feed into Lake Tahoe and the South Fork American River. Smoke emissions contributed to regional atmospheric chemistry discussions involving researchers at the National Oceanic and Atmospheric Administration and the Environmental Protection Agency, while forest regeneration and fuel treatment debates engaged stakeholders such as the Sierra Club and the The Nature Conservancy.
Recovery efforts encompassed debris removal overseen by El Dorado County, California and federal partners, rebuilding permitting processes involving county planning departments and state agencies like the California Governor's Office of Emergency Services, and financial assistance programs administered by the Federal Emergency Management Agency and the Small Business Administration. Policy responses spurred legislative attention in the California State Legislature and discussions at the federal level involving the United States Department of the Interior about forest management, prescribed burning, and funding for community resilience programs promoted by organizations including the National Association of Counties and the Forest Stewardship Council. Long-term monitoring of ecological recovery integrated work by universities, state agencies, and citizen science initiatives coordinated through platforms associated with the National Park Service and regional watershed councils.
Category:2021 wildfires in the United States