"The fire’s rapid growth to over 166,000 acres and the high level of resources committed—up to 1,928 personnel and an estimated cost exceeding $126 million—highlight its significant threat to the region’s ecosystems and communities."
The SINLAHEKIN wildfire, located in Okanogan County, Washington, was first discovered on July 26, 2026, and remains active as of September 13, 2026. The fire has expanded from 120,692 acres on August 6 to a peak of 166,868 acres on August 30, before stabilizing around 166,000 acres. Containment rose from 20% on the first report to 76% by September 9, with a brief dip to 41% on August 30 but recovering to 76% by September 13. The incident is caused by an undetermined source and is managed by the Washington Department of Natural Resources. Fire behavior has fluctuated from extreme crown runs and spotting in early August to moderate and minimal smoldering in late September, with personnel ranging from 1,312 to 1,928 across the timeline.
Official source description: 1 Miles W from Tonasket, WA
Minimal; Smoldering; Creeping
Good air quality. Outdoor activity is generally safe near this incident.
Nearest reporting station: Omak. Source: AirNow.gov (EPA).
Given the current minimal, smoldering behavior and 76% containment, general wildfire safety guidance applies: stay informed, avoid the fire perimeter, and follow any local evacuation orders.
IRWIN ID: {78D35D3B-F791-4961-AE36-C6D1A4DFF5A0}
Discovered: Jul 26, 2026
Cause: Undetermined
Managing Agency: DNR
Est. Cost to Date: $129,345,304
Coordinates: 48.7046, -119.6931
Other wildfires that have recently been contained or dropped from official tracking in WA.
The SINLAHEKIN Fire has burned 166,000 acres as of September 15, 2026.
As of the latest update, the SINLAHEKIN Fire is 77% 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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