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Terwilliger Fire

Unit Information

Willamette National Forest
U.S. Forest Service
Springfield, OR 97477

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This incident is no longer being updated.

Bridge being protected by fire hoses on East Fork trail.Image options: [ Full Size ]

The Terwilliger Fire was reported on August 19, 2018, around 3:21pm located approximately approximately five miles southeast of Blue River, Oregon.

Oregon Department of Forestry, US Forest Service fire crews and local landowners responded to suppress the fast moving fire.

Following extended initial attack efforts, additional personnel and equipment were ordered. An incident management team was requested to help manage the growing fire.

The fire surrounds the Cougar Reservoir and numerous recreation sites and prompted the Willamette National Forest to implement the Terwilliger Area Closure for public safety.

The Terwilliger Fire remains within the boundaries of the McKenzie Ranger District, Willamette National Forest, including the Three Sisters Wilderness.

The fire is being managed as a full suppression fire.

Basic Information

Current as of
Incident TypeWildfire
CauseUnder Investigation
Date of OriginSunday August 19th, 2018 approx. 03:21 PM
Location5 Miles SE of Blue River
Incident CommanderJerry Van Dyne, Southern Cascades Interagency Incident Management Team
Coordinates44.084 latitude, -122.238 longitude

Current Situation

Total Personnel98
Size11,555 Acres
Percent of Perimeter Contained80%
Fuels Involved

Closed Timber Litter

hardwood litter

Timber (litter and understory)

The fuels in the fire area consist of timber with understory of dead woody fuels, which are the primary carriers of surface fire. Heavy downed woody fuels are very dry due to the extreme drought. Resistance to control is very high due to steep slopes, deep canyons, large snags, deep duff, and heavy downed woody fuels in many areas. Lichen in the trees are a primary source of tree torching when fine fuels are dry.

Significant Events






Fire behavior continues to be minimal. Fire spread is mainly through creeping and backing. Low flame lengths continue to consume heavy fuels. Torching has not been observed,but has the potential as the moss/lichen component dries out and becomes available fuel. Burning debris is still available to roll/skid down hill and deliver embers over the line. Fire in most divisions is limited to the heavy fuels (1000 & 10,000 hr.),snags and duff/ground fuels.


Planned Actions

Continue patrol and mop-up in Div A/D/Z. Div P is prepped and ready if the fire crosses the south fork of the McKenzie river to implement a firing operation to hold FS road 1993. Additional felling teams have been brought in to work on hazard tree mitigation and removal along the 500 road.

Projected Incident Activity

12 hours:

Sunny, with a high near 60-65. Humidity 33-38%. Winds East 8-13 mph with gusts to 25 mph.

24 hours:

Friday - Sunny, Temperatures to 69, Humidity 31% Winds East 4-8 mph.

48 hours:

Saturday - Clear highs to 71 East winds 5-8 mph. Humidity 31%.

72 hours:

Sunday -Sunny, with a high near 71.Humidity 27% Winds East 12-18 mph with gusts to 25 mph


16 pieces of heavy equipment, 1 type 2 IA hand crew, 4 engines, and 1 ambulance.

Current Weather

Weather Concerns

Spot forecast:

A warming and drying trend begins Thursday as high pressure builds across the Pacific Northwest. Offshore flow increases through early next week with the main impact along the ridges, and aligned drainages. Sunday looks particularly dry and breezy with humidity locally in the teens and wind gusts possibly reaching 30 mph near the Cascade gaps. Haines 4 and 5 values driven by the air aloft. No significant instability expected.