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Unit Information

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

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Incident Contact

Thielsen Fire Information
Phone: 541-595-8227
Hours: Su-Sa 8am-8pm

Highlighted Activity

09/29/2020 Archie Creek and Thielsen Fire Update for September 29, 2020
  Archie Creek and Thielsen Fires Update September 29, 2020 Unified Incident Commanders Mike Dueitt and Tim Keith Hours: 8 am-8 pm   Archie Creek Fire Email: Phone:.
News - 09/29/2020
Thielsen Fire Map for 9/29/2020Image options: [ Full Size ]

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. 

The command of the fire transitioned to the Southern Area Gray Team on September 12th, then to the Southern Area Gold Team on September 15th, and the Southern Area Red Team assumed command on September 27th. The Southern Area Red Team is managing the Thielsen Fire along with the Archie Creek Fire.

Most of the fire activity on the Thielsen Fire has decrease significantly due to several days of rain. As temperatures warm, the fire may continue to produce smoke from stumps and logs that are still burning. Over the next several days, crews will be pulling hoses and other supplies off the line, and they will be conduction suppression repairs.

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 CommanderMike Dueitt - ICT1 Steve Parrish - Deputy ICT1 Charlie Patterson - ICT1(t)
Incident DescriptionThielsen Wilderness Fire
Coordinates43.16 latitude, -122.07 longitude

Current Situation

Total Personnel302
Size9,971 Acres
Percent of Perimeter Contained69%
Estimated Containment DateSaturday October 10th, 2020 approx. 12:00 AM
Fuels Involved

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

Significant Events





Planned Actions

Resources will remove & backhaul remaining hose and begin suppression repair action in division A/M that has been deemed safe to do so. In Division P/W, resources will patrol and secure lines. Resources will continue to improve containment contingency lines along FS road 60. MIST tactics are being implemented by resources.

Projected Incident Activity

12 hours: Moderated humidity will allow remaining areas of heat to continue smoldering throughout the evening hours. Winds taper off through the overnight hours. Overnight humidity recoveries are

poor with high values only reaching the upper 30%s.

24 hours: Lighter winds Tuesday with temperatures continuing to trend higher. Temperatures should reach into the 80s while relative humidity values tumble into the mid teens. Increased

potential for spread in areas retaining heat near available fuels.

48 hours: High pressure dominates with resultant temperature and relative humidity values exceeding seasonal norms. Temperatures in the 80s and relative humidity values once again in the mid teens can be expected. Continuing potential for spread in areas retaining heat near available


72 hours: Conditions remain similar to Wednesday with temperatures in the 80s and humidity dipping into the teens. Overnight humidity recoveries remain in the poor to moderate range.

Continuing potential for spread in areas retaining heat near available fuels.

Anticipated after 72 hours: Temperatures continue to surge to well above normal values with humidity dropping in the teens to low 20%s. Wind patterns will be terrain driven and remain relatively light. Overnight humidity recoveries remain poor to moderate

with the area of high pressure overhead. ERC continues to gradually rise into next week and is expected to reach the 85th percentile by next Wednesday

Current Weather

Weather Concerns

Gusty east winds coupled with humidity values in the teens have conditions nearing critical levels for fire weather. Breezy winds continued into the overnight period and this along with poor humidity recoveries kept concerns elevated. Southeasterly winds taper off early Tuesday leading to terrain driven winds for much of the day. Humidity values once again fall into the teens as temperatures soar into the 80s for Tuesday. Hot and dry conditions are expected to remain in place for the remainder of the week with mainly terrain driven winds