Washington · Active · 153,843 acres
Sinlahekin Fire, Washington
153,843
Acres reported
44%
Contained
+1,161
Acres since yesterday
Last updated · refreshed every 15 minutes from the NIFC WFIGS feed · awareness only — follow local authorities
Update ·
As of Aug 18, 2026, 09:15 UTC, the Sinlahekin Fire is listed as active at 153,843 acres, 44% contained, in Okanogan County, Washington.
Since Aug 17, 2026, 09:00 UTC: +1,161 acres.
The most recent mapped perimeter (Aug 17, 2026, 19:36 UTC) covers 2.4 acres; the mapped perimeter has been updated 43 times since the fire began.
Satellites (VIIRS/MODIS) registered 246 heat detections matched to this incident in the last 24 hours, the latest at Aug 17, 2026, 12:27 UTC.
Sinlahekin Fire map
The most recent mapped perimeter (solid) and the previous day's perimeter (dashed), with the reported point of origin.
Latest perimeter Previous perimeter · Perimeters come from the WFIGS interagency perimeter service and are usually mapped once a day; the mapped area can differ from the reported acreage.
Key facts
- Size
- 153,843 acres
- Containment
- 44%
- Status
- Active
- Discovered
- Jul 26, 2026
- Location
- Okanogan County, Washington
- Origin point
- 48.7046, -119.6931
- Perimeter mapped
- Aug 17, 2026 (14 hours ago)
- Satellite heat, 24 h
- 246 detections
Nearest towns
Distances are from the reported point of origin, not from the fire’s edge (see the perimeter map for the current extent).
- Tonasket, WA
- Oroville, WA
- Omak, WA
- Okanogan, WA
- Brewster, WA
Other fires nearby
- Reevas Basin Fire
- Ptarmigan Fire
Sinlahekin Fire daily history
The largest size and containment reported each UTC day, from our 15-minute archive of the federal feed (first seen Jul 26, 2026, 21:30 UTC).
| Day (UTC) | Reported size | Change | Contained |
|---|---|---|---|
| Aug 18, 2026 | 153,843 acres | +1,161 | 44% |
| Aug 17, 2026 | 152,682 acres | 0 | 44% |
| Aug 16, 2026 | 152,682 acres | 0 | — |
| Aug 15, 2026 | 152,682 acres | −239 | — |
| Aug 14, 2026 | 152,921 acres | 0 | — |
| Aug 13, 2026 | 152,921 acres | +2,680 | — |
| Aug 12, 2026 | 150,241 acres | +2,526 | — |
| Aug 11, 2026 | 147,715 acres | +6,304 | — |
| Aug 10, 2026 | 141,411 acres | +3,800 | — |
| Aug 9, 2026 | 137,611 acres | +10,671 | — |
| Aug 8, 2026 | 126,940 acres | +133 | — |
| Aug 7, 2026 | 126,807 acres | +6,115 | — |
| Aug 6, 2026 | 120,692 acres | +3,614 | — |
| Aug 5, 2026 | 117,078 acres | +14,144 | — |
| Aug 4, 2026 | 102,934 acres | +29,140 | — |
| Aug 3, 2026 | 73,794 acres | +37,526 | — |
| Aug 2, 2026 | 36,268 acres | +9,477 | — |
| Aug 1, 2026 | 26,791 acres | +15,475 | — |
| Jul 31, 2026 | 11,316 acres | +2,590 | — |
| Jul 30, 2026 | 8,726 acres | +5,736 | — |
| Jul 29, 2026 | 2,990 acres | 0 | — |
| Jul 28, 2026 | 2,990 acres | +2,047 | — |
| Jul 27, 2026 | 943 acres | +343 | — |
| Jul 26, 2026 | 600 acres | — | — |
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Sinlahekin Fire questions, answered from the data
How big is the Sinlahekin Fire?
As of Aug 18, 2026, 09:15 UTC, the Sinlahekin Fire is reported at 153,843 acres. Since Aug 17, 2026, 09:00 UTC: +1,161 acres.
Is the Sinlahekin Fire contained?
Not fully. It was 44% contained as of Aug 18, 2026, 09:15 UTC. Containment is the share of the fire's edge that has a control line; it is reported by the incident team and can lag the ground situation.
Where is the Sinlahekin Fire?
The reported point of origin is at 48.7046, -119.6931 in Okanogan County, Washington. Nearest towns: Tonasket (12 mi E), Oroville (20 mi NE), Omak (22 mi S). The map on this page shows the most recent mapped perimeter.
Is the Sinlahekin Fire still burning?
The federal feed still lists it as active as of Aug 18, 2026, 09:15 UTC, and satellites registered 246 heat detections matched to it in the last 24 hours.
Where do I find evacuation orders for the Sinlahekin Fire?
From the county sheriff and local emergency management, not from this site. Check the official Washington sources on our Washington page and your county’s alert system. FireRiskHere is for awareness only.
How current is this page?
The numbers come from the National Interagency Fire Center's WFIGS incident feed and the WFIGS perimeter service, refreshed every 15 minutes, plus NASA FIRMS satellite detections hourly. This page was last updated Aug 18, 2026, 09:15 UTC. Acreage and containment are what the incident team reports and can lag by hours.
About this page
This page is generated automatically for every wildfire whose reported size reaches 1,000 acres, from FireRiskHere’s archive of the National Interagency Fire Center’s WFIGS incident feed (captured every 15 minutes), the WFIGS interagency perimeter service, and NASA FIRMS satellite detections. It stays online after the fire is contained as a record of the incident. Nothing here is an official notice — for evacuation orders and road closures follow your county sheriff and local emergency management. How the site works →