"This incident is notable for its large size—over 166,000 acres—and the significant resources committed, including nearly 2,000 personnel and an estimated cost exceeding $140 million, reflecting its impact on regional fire management and public safety."
The SINLAHEKIN wildfire, located in Okanogan County, Washington, was discovered on July 26, 2026 and is currently active under the jurisdiction of the Washington State Department of Natural Resources. The fire has grown to 166,007 acres with 92% containment as of September 23, 2026, after a peak of 166,868 acres on August 30. Early reports showed rapid expansion and extreme behavior, including crown runs and spotting, but containment efforts have steadily increased, reducing the fire’s growth and shifting behavior to minimal and smoldering. Personnel deployment peaked at 1,928 on August 6 and has since fluctuated, with the latest count at 461. Estimated costs have risen to approximately $140.6 million.
Official source description: 1 Miles W from Tonasket, WA
Minimal; Creeping; Smoldering
Moderate air quality. Unusually sensitive individuals should consider reducing prolonged outdoor exertion.
Nearest reporting station: Omak. Source: AirNow.gov (EPA).
The fire remains in a minimal, smoldering state with 92% containment. Residents in the vicinity should remain vigilant for potential flare-ups, keep emergency supplies ready, and follow any local evacuation orders. General wildfire safety guidance applies.
IRWIN ID: {78D35D3B-F791-4961-AE36-C6D1A4DFF5A0}
Discovered: Jul 26, 2026
Cause: Undetermined
Managing Agency: DNR
Est. Cost to Date: $140,565,879
Coordinates: 48.7046, -119.6931
Other wildfires that have recently been contained or dropped from official tracking in WA.
The SINLAHEKIN Fire has burned 166,007 acres as of September 23, 2026.
As of the latest update, the SINLAHEKIN Fire is 92% contained.
The official cause has been listed as: Undetermined.
The SINLAHEKIN Fire is burning in Okanogan, WA.
Yes, as of the latest official update, the SINLAHEKIN Fire remains active.
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