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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

10/01/2020 Archie Creek and Thielsen Fire Update for October 1, 2020
  Archie Creek and Thielsen Fires Update October 1, 2020 Unified Incident Commanders Mike Dueitt and Tim Keith Hours: 8 am-8 pm   Archie Creek Fire Email: Phone:...
News - 10/01/2020
Thielsen Fire Map 10-01-2020Image 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 Personnel208
Size9,974 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





Continued drying further support the consumption of deep duff and heavy down and dead fuels.

Negligible midflame winds suppress any spread. In those areas exposed to sun and wind that have

available fuels, some spread could occur


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 remove & backhaul remaining hose and begin suppression repair action where it has been deemed safe to do so. Resources will continue to improve containment contingency lines along FS road 60. MIST tactics are being implemented by resources.

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: Good overnight relative humidity recovery limited the burn period to a few hours in the midafternoon. Fire continues to smolder in fuels comprised of deep duff and heavy down dead that

have recovered from recent rainfall.

24 hours:

Light terrain driven winds Thursday with temperatures continuing to trend higher.

Temperatures should soar into the 80s with relative humidity values dipping into the mid

teens. Increased potential for spread in areas retaining heat near available fuels however, light

winds limit spread potential.

48 hours:

High pressure dominates with resultant temperature and relative humidity values exceeding

seasonal norms. Temperatures around 80 and relative humidity values only dip to around 20%.

Continuing potential for spread in areas retaining heat near available fuels however, light

winds continue to limit spread potential.

72 hours:

Moving into the weekend will finally bring temperatures down 5 to 10 degrees from midweek

highs with daytime humidity recoveries not dipping as low. Overnight humidity recoveries will

also improve late in the week. Decrease in temperatures coupled with increased relative

humidity values should moderate spread potential while consumption of deep duff and heavy

down dead fuels continues to be the observed trend.

Anticipated after 72 hours:

Temperatures remain above normal moving into next week, but are not as hot as

what was observed during the previous week. Humidity minimums and

recoveries will be better than last week. No chance of precipitation looks present

through the middle of next week. ERC values continue trending slowly higher

however, those values should remain below the 70th percentile for the next.

Current Weather

Weather Concerns

The weather pattern becomes rather repetitive as we remain under

the ridge of high pressure. Temperatures continue to be well above

normal with humidity values dipping into the teens for the next

couple days. Pushing into the weekend will bring temperature down

a few degrees with humidity minimums rising into the 20s.

Overnight humidity recoveries should improve moving forward. Over

the next few days we will start to accumulate smoke from other

fires as transport winds remain weak.