Skip to main content

Black Mountain

Unit Information

Beaverhead-Deerlodge National Forest
U.S. Forest Service
420 Barrett St
Dillon, MT 59725

USFS Shield

Alder Creek, Christensen, Trail Creek and Black Mountain Update 8.19.21

Black Mountain Wildfire
News – 8/19/2021

 Alder Creek, Trail Creek, Christensen, and Black Mountain

Fire Update
August 19, 2021



Alder Creek
Size: 13,984 Acres
Containment: 15%
Location: 7 miles west of Wise River, MT
Start Date: July 8, 2021
Cause: Unknown
Total personnel: 281

Trail Creek
Size: 38,845 Acres
Containment: 26%
Location: 20 miles west of Wisdom, MT
Start Date: July 8, 2021
Cause: Lightning
Total personnel: 239

Size: 11,012 Acres
Containment: 15%
Location: 12 miles west of Wise River, MT
Start Date: July 16, 2021
Cause: Unknown
Total personnel: 52

Black Mountain
Size: 1,042 Acres
Containment: 90%
Location: 13 miles south of Jackson, MT
Start Date: July 17, 2021
Cause: Lightning
Total personnel: 1


Alder Creek Fire: On Wednesday, the Beaverhead County Sheriff rescinded all evacuations around Highway 43 and the Pioneer Scenic Byway; there are currently no remaining evacuations in Beaverhead County. Structure protection will remain in place. Firefighters will focus efforts on strengthening containment lines and removing pockets of heat that remain throughout the fire. Much of this effort will be concentrated in the Dino Creek Drainage near the Pioneer Scenic Byway and Foolhen Ridge along the northwest portion of the fire.  

Christensen Fire: Minimal fire activity was observed on the Christensen Fire on Wednesday, and similar conditions are expected today. Favorable conditions will allow firefighters to access the northern perimeter of the fire and mop-up hotspots.  

Trail Creek Fire: Crews have worked hard to keep the fire from crossing Threemile Creek and have successfully anchored containment lines into Gibbonsville Road. Structure protection remains throughout the area, and smoke will continue to be visible once the inversion layer lifts and the current weather system passes. Residents in Lemhi County in and near Gibbonsville remain in a “Set” evacuation status. Crews will continue to improve control lines and mop-up hot spots in and around Battle Mountain near the Big Hole Battlefield, and Gory Creek on the southeastern portion of the fire.   

 Black Mountain Fire: With containment of the Black Mountain Fire increasing to 90 percent, and no fire activity observed for nearly two weeks, resources will continue to be reassigned to other fires throughout the area. The Black Mountain Fire will continue to be patrolled, and crews will look for and extinguish any remaining heat throughout the fire.   

Fire Weather: Widespread precipitation across all four fires occurred over the past two days, with total accumulation ranging from 1-4 tenths of an inch. This precipitation has resulted in nearly 100 percent humidity recovery at night, causing minimal fire behavior and favorable firefighting conditions. Today, temperatures will be warmer, with highs varying from the mid-50s to mid-60s, with light winds at 5-10 mph out of the northwest. Minimum relative humidity will be 50 percent. There is a 45 percent chance of precipitation today, with an increase in precipitation occurring in the coming days.  

Major Closures:
Hwy 43 and Pioneer Byway remain open. Motorists are asked to slow down and be on the alert for firefighters, heavy smoke, and downed trees. Please check the Montana DOT Road Report website for current conditions. 
Continental Divide Trail: Closed from Lemhi Pass north to Mussigbrod Creek. 
Big Hole National Battlefield is closed until further notice. North and South VanHouten, Miner Lakes, Twin Lakes, May Creek and Divide Bridge Campgrounds are closed. 
Forest Closure orders in the Beaverhead-Deerlodge and Salmon-Challis National Forests are in effect for all three fires. 
 Stage 2 Fire Restrictions are in effect for SW Montana 

 Stage 1 Fire Restrictions are in effect for Central ID 

There are currently no Stage 1 evacuations in place for Beaverhead County. All previous Stage 1 evacuations were rescinded by the Beaverhead County Sheriff as of August 18, 2021. Structure protection efforts will remain in place. 
Lemhi County Sheriff has contacted residences in potentially threatened areas on the west side of the Trail Creek Fire in Idaho and placed them in a “Set” evacuation status.

Evacuation Info: 208-756-8980.  

Inciweb: For updates and additional incident information can be found at

Fire Information Line: 406‐624‐9452 (8am‐8pm)