Firefighters are battling the Sisi Fire on the Okanogan-Wenatchee National Forest in north-central Washington, where the lightning-caused blaze has grown to 4,439 acres with containment at just 29 percent as of Friday evening, October 9.
The fire ignited on August 14 in steep, remote terrain approximately 10 miles northwest of Stehekin and has proven difficult to suppress due to rugged slopes, heavy fuel loads, and active fire behavior. Complex Incident Management NW Team 12, under Incident Commander Jeff Dimke and Deputy IC Bob Shindelar, assumed command of the Sisi Fire on September 30, combining operations with the nearby Little Giant Fire.
Terrain and Fuel Conditions Drive Challenges
The Sisi Fire burns through a complex mosaic of closed timber litter, brush understory, and grass-shrub fuels dominated by Douglas fir, true fir species, and ponderosa pine. Large snags and heavy downed fuel loadings throughout the area continue to retain heat, serving as persistent ignition sources even as surface fire activity moderates with the onset of fall weather.
The U.S. Forest Service initially deployed Type 1 helicopter and rappeler support following the August lightning storm, achieving early progress before severe hazards—including tree torching and rolling debris on 50-percent slopes—forced crews to disengage for their safety. A critical weather event on August 20 triggered significant fire growth that extended the incident into a long-duration suppression effort.
As of Friday, 32 personnel remain assigned to the incident. Fire behavior has moderated in recent days, with backing, creeping, and smoldering activity on lower and mid-slopes south of the Stehekin River and along Agnes Creek. Only the northwest portion of the fire received measurable rainfall from a recent system; heavy fuels in other areas continue to retain heat and can produce flare-ups as drying occurs.
Communities and Resources at Risk
Values at risk include the communities of Lucerne, Holden Village, and Stehekin, along with recreation infrastructure, cultural resources, and significant natural areas within the Glacier Peak Wilderness and North Cascades National Park corridor. The Pacific Crest Trail remains closed between the North Cascades National Park/Glacier Peak Wilderness boundary and High Bridge along the Agnes Creek section.
Incident managers are utilizing a full-suppression strategy focused on keeping the fire within the smallest practicable footprint while prioritizing firefighter and aviator safety in extremely hazardous terrain.
Weather Change Expected This Weekend
A strong weather system is forecast to move into the North Cascades beginning Friday night, bringing rain, strong winds, and mountain snow. Snow levels are expected to drop to approximately 5,100 feet, with precipitation lingering into the weekend. The incoming storm is expected to significantly moderate fire activity and may substantially accelerate containment progress across the upper elevations of the fire area.
Residents and visitors can monitor the Okanogan-Wenatchee National Forest alerts at fs.usda.gov/r06/okanogan-wenatchee and the North Cascades National Park fire closures page for updates. For direct fire information, call 509-776-6953.