Sierra National Forest
U.S. Forest Service
1600 Tollhouse Road
Clovis, CA 93611
CLOVIS, Calif. — The Forest Service announced the results of the investigation into the cause of the Creek Fire, a wildfire that began on September 4, 2020, and burned approximately 379,895 acres, destroyed 853 structures, and damaged an additional 64 structures on the Sierra National Forest below Big Creek.
Despite an exhaustive investigation, the cause of the fire is officially categorized as “undetermined.” Fire investigators determined that the most probable cause was a lightning strike. Possible causes that were not excluded were deliberately and unlawfully setting fire to property (arson/incendiary) and smoking activities, such as tobacco. An “undetermined” status is not uncommon given the complexities involved.