Btt Sw 53 Fire
199031,318 acresAlaska
The Btt Sw 53 Fire burned 31,318 acres, about 49 square miles, across Yukon-Koyukuk Census Area. It began on July 19, 1990.
Watch how it happenedBtt Sw 53 Fire · 1990
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 | 10% | 3,220 |
| Moderatemixed: many trees killed, some survive | 31% | 9,792 |
| Lowsurface fire, most trees survive | 29% | 9,160 |
| Unburned to lowislands inside the perimeter, little change | 22% | 6,903 |
| Increased greennessvegetation greener after the fire than before | 0.3% | 102 |
| Not mappedcloud, shadow or water in the satellite images | 6.8% | 2,141 |
10% of the area inside the perimeter burned at high severity, about 3,220 acres; 42% 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 | 31,344 |
Other large fires in Alaska in 1990
- Fyu Ne 85 Fire438,445 acres
- Kan 7 Fire367,541 acres
- 032018 Fire333,320 acres
- 032042 Fire123,277 acres
- Tok River Fire95,722 acres
- Gal N 38 Fire61,334 acres
- 032033 Fire27,880 acres
- Hot Slough Fire26,393 acres
Monitoring Trends in Burn Severity (USGS and U.S. Forest Service). Type recorded: Wildfire.