531047 Fire
198578,940 acresAlaska
The 531047 Fire burned 78,940 acres, about 123 square miles, across Yukon-Koyukuk Census Area. It began on August 6, 1985.
Watch how it happened531047 Fire · 1985
How it happened
See how severely each place burned, revealed outward from where it started.
How severely it burned
Burn severity inside the final perimeter, classified from Landsat images taken before and after the fire.
| Severity | Share | Acres |
|---|---|---|
| Highmost vegetation consumed, soils altered | 11% | 8,477 |
| Moderatemixed: many trees killed, some survive | 49% | 38,641 |
| Lowsurface fire, most trees survive | 11% | 8,545 |
| Unburned to lowislands inside the perimeter, little change | 6.3% | 4,940 |
| Not mappedcloud, shadow or water in the satellite images | 23% | 18,337 |
11% of the area inside the perimeter burned at high severity, about 8,477 acres; 60% burned at moderate or high severity.
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.
| Yukon-Koyukuk Census Area | AK | 79,003 |
Monitoring Trends in Burn Severity (USGS and U.S. Forest Service). Type recorded: Wildfire.