Lost River Ranger District

kane imageWelcome to the Lost River Ranger District. The Lost River Ranger District, which is located in central Idaho, is part of the Salmon-Challis National Forest.

The district is responsible for managing National Forest lands in the Big Lost River and Little Lost River drainages and a small portion of the Wood River drainage. Our district office is located in Mackay, Idaho.

To see some facts about the district please select the link below. If you have questions or comments about the district or this web site please feel free to contact us. 

Facts about the Lost River Ranger District:

Forest Region: Intermountain Region (Region 4)



District Headquarters:

Mackay, Idaho


817,000 acres

Mountain Ranges on the District:

Boulder, Pioneer, White Knob, Lost River, Lemhi

River Basins on the District:

Big Lost River, Little Lost River, Wood River

Counties on the District:

Custer, Butte, Lemhi, Clark, Blaine

Nearby Towns and Cities:

Mackay, Moore, Arco, Howe, Challis, Sun Valley, Hailey, Ketchum

Highest Point:

Borah Peak, 12,662 feet

Lowest Point:

Forest Boundary near Eightmile Canyon, 5,550 feet

Number of Named Peaks over 12,000 feet:


Number of Named Peaks over 11,000 feet:


Number of Permanent Employees (Year 2019):


Number of YCC employees (Year 2019):


Number of Volunteers:


Number of Seasonal Employees (Year 2019):


Threatened or Endangered Species on the District:

Bull Trout (Threatened)

Average Number of Wildfires per Year from 1966 - present:


Average Number of Wildfires that were Person Caused from 1966 - present: