Logan Fire

201730,077 acresColorado

The Logan Fire burned 30,077 acres, about 47 square miles, across 3 counties. It began on March 6, 2017.

Watch how it happened

Logan Fire · 2017

How it happened

Watch it burn in the order satellites saw it, coloured by how severely each place burned.

About this replay

Date (UTC)—Historical replay

Burned so far—acres

High severity—of the area so far

Detections61satellite fire pixels

Fire milestones

Burn severityHigh, Moderate, Low, Unburned to low, Increased greenness

Burning nowAreas reached in the last half day of satellite passes

Manhattan, to scale23 square miles of land, drawn at the fire’s scale

Timing: NASA FIRMS satellite fire detections (41 VIIRS and 20 MODIS) inside the final perimeter; each place takes the time of its nearest detection, so the order is satellite-observed but interpolated between passes, roughly every 12 hours. Severity: Monitoring Trends in Burn Severity (USGS, U.S. Forest Service), mapped from Landsat after the fire.

How severely it burned

Burn severity inside the final perimeter, classified from Landsat images taken before and after the fire.

Map of burn severity across the Logan Fire

Burn severity by class
Severity	Share	Acres
Lowsurface fire, most trees survive	63%	19,003
Unburned to lowislands inside the perimeter, little change	32%	9,655
Increased greennessvegetation greener after the fire than before	4.7%	1,419

Most of the area inside the perimeter burned at low severity or not at all.

Monitoring Trends in Burn Severity (U.S. Geological Survey and USDA Forest Service). Classes come from the change in a Landsat burn index (dNBR) between images before and after the fire; acres are each class’s share of the fire’s mapped area.

Where it burned

Acres inside each county, measured from the satellite-mapped perimeter.

Acres burned by county

Logan County	CO	19,707
Phillips County	CO	10,057
Sedgwick County	CO	311

Monitoring Trends in Burn Severity (USGS and U.S. Forest Service). Type recorded: Wildfire.