Exact Location and Geography of the Marshall Fire
The Marshall Fire burned in Boulder County, Colorado, primarily in the suburban communities of Superior and Louisville, located west of Denver and east of the Rocky Mountain foothills. The fire started on December 30, 2021, and was fully contained on December 31, 2021, after spreading across approximately 6,000 acres in a single day. The ignition point was traced to a specific area in the Old Town neighborhood of Superior, near the intersection of Marshall Road and Five Mile Canyon, where strong winds and dry conditions caused rapid fire growth into residential zones. For a detailed map of the burn perimeter and evacuation zones, the Boulder County Sheriff's Office provides official GIS data on its website bouldercounty.gov.
The fire's path moved eastward through the foothills foothill communities, driven by gusts exceeding 100 mph, and destroyed over 1,000 homes and businesses across Superior and Louisville. The fire was fully contained by December 31, 2021, after burning for approximately 36 hours. The exact origin point was identified by investigators as a location near the Marshall Road area in Superior, with the fire spreading rapidly due to extreme wind conditions and dry vegetation. The burn scar covers a significant portion of the area between the two towns, with the fire crossing major roads and affecting multiple neighborhoods within the city limits of Superior and Louisville.
Cause and Official Investigation Findings
The official cause of the Marshall Fire was determined by Boulder County investigators to be a fire originating from a specific location in the Old Town area of Superior, with the fire spreading rapidly due to extreme wind conditions and dry vegetation. The investigation concluded that the fire was not caused by power lines or utility infrastructure, but rather by a specific ignition source in the area, with the exact cause detailed in the official Boulder County Sheriff's Office report bouldercountysheriff.org.
Investigators from the Boulder County Sheriff's Office and the Colorado Division of Fire Prevention and Control conducted a thorough origin and cause investigation, concluding that the fire started in a specific location near residential structures in the Old Town neighborhood of Superior. The fire spread rapidly due to wind gusts exceeding 100 mph, low humidity, and dry fuels, with the fire crossing major roads and affecting multiple neighborhoods within the city limits of Superior and Louisville. The official investigation report confirmed that the fire was not caused by power lines or utility infrastructure, but rather by a specific ignition source in the area.
Financial Impact and Recovery Efforts
The Marshall Fire caused an estimated $2 billion in total insured losses, making it one of the most destructive wildfires in Colorado history in terms of property damage. The fire destroyed over 1,000 homes and businesses, with the majority of losses concentrated in the city of Superior, where the fire originated and spread most rapidly through residential neighborhoods. The City of Superior and the City of Louisville declared local emergencies, and the Federal Emergency Management Agency (FEMA) approved individual assistance for affected residents, with the official disaster declaration details available on the FEMA website fema.gov.
The financial impact of the Marshall Fire extended beyond property damage to include business interruption losses, infrastructure repair costs, and long-term economic effects on the affected communities. The City of Superior and the City of Louisville implemented recovery plans, with the City of Superior establishing a Marshall Fire Recovery Office to coordinate rebuilding efforts and provide resources to affected residents. The Colorado Division of Fire Prevention and Control and the U.S. Forest Service provided technical assistance for post-fire recovery, with the official recovery plan and updates available on the Colorado Division of Fire Prevention and Control website dfpc.colorado.gov.