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Unit Information

Umpqua National Forest
U.S. Forest Service
Roseburg, OR 97471

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This incident is no longer being updated.

Thielsen Fire Map 10-08-2020Image options: [ Full Size ]

October 9, 2020: This page is no longer being updated. Updates for the Thielsen Fire can be found on the Archie Creek Fire Inciweb page. Thielsen Fire Information can also be obtained at 941-334-7674 or

Tuesday, September 8, 2020, at approximately 8:30 AM, firefighters responded to a wildfire in the Mount Thielsen Wilderness. The fire began in the tree line near the Pacific Crest Trail within the Diamond Lake Ranger District. The east wind event caused the fire to run northwest and jump Highway 138 E. 

As of October 6, Northwest Incident Management Team 12 (Incident Commander Bob Shindelar) is managing the Thielsen Fire along with the Archie Creek Fire.

Most of the fire activity on the Thielsen Fire has decreased significantly. The fire will continue to produce smoke from stumps and logs that are still burning. 

Basic Information

Current as of
Incident TypeWildfire
Date of OriginTuesday September 08th, 2020 approx. 08:30 AM
Location5 miles north of Crater Lake National Park and within 1 mile of Diamond Lake Resort
Incident CommanderBob Shindelar - ICT2
Incident DescriptionThielsen Fire
Coordinates43.16 latitude, -122.07 longitude

Current Situation

Total Personnel106
Size9,975 Acres
Percent of Perimeter Contained71%
Fuels Involved

Timber (Litter and Understory) Timber (Grass and Understory) Brush (2 feet)


Heavy mixed conifer overstory, moderate to heavy levels of down woody fuels and jackpots, organic soils 2-8 inches deep. Unsheltered planted conifer regeneration 2-6 feet with grass and shrub understory.

Significant Events





Planned Actions

In Div-A/M/P/W, patrol and mop-up as needed. Also complete suppression repair.

Resources will continue to improve Shaded Fuel Break along FS road 60.

In the North Diamond Div, remove hazard tress within 150' of the 005 road. Improve ingress and egress from the 005 road to highway 138. Deck merchantable material in designated areas. Haul unmerchantable material to chipping site and chip.

Projected Incident Activity

Projected Incident Activity, Potential, Movement, Escalation, or Spread and influencing factors during the next operational period and in 12-, 24-, 48-, and 72-hour time frames:

12 hours: Continued smoldering in heavy fuels and stumps. No perimeter growth expected.

24 hours: Continued smoldering in heavy fuels and stumps. No perimeter growth expected.

48 hours: Smoldering continues in heavy fuels and stumps. No perimeter growth expected.

72 hours: Minimal fire behavior. Smoldering continues. No perimeter growth expected.


A virtual cooperators meeting was held this morning. This will be the last schedule meeting however team members are available for ad hoc meetings if issues are encountered or information needs to be shared.

Current Weather

Weather Concerns

After some morning fog in the lower elevations, partly cloudy skies prevailed across the fire today, with some haze and smoke from fires to the south. Temperatures ranged from the low 60s to the mid 70s this afternoon and relative humidity values ranged from the low to mid 30 percent range in the lower elevations, to the low to mid 20 percent range in the upper elevations. Widespread rainfall will begin early Saturday morning and continue through the day. The rain will diminish Saturday evening, but occasional rain will continue Saturday night, with the possibility of a rain/snow mix Saturday night into Sunday morning at higher elevations. Mostly cloudy skies will prevail on Sunday and Monday with a continued chance of rain showers.