Lost River Ranger District
Address: 716 W Custer Mackay, ID 83251
Hours of Operation: Monday - Friday 8:00 am - 4:30 pm (Closed on federal holidays)
Office Phone: 208-588-3400
Mailing Address: P.O. Box 507 Mackay, ID 83251
Additional Office Information
Welcome 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.
Forest: Salmon-Challis
District Headquarters: Mackay, Idaho
Area: 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 & Cities: Mackay, Moore, Arco, Howe, Challis, Sun Valley, Hailey, Ketchum
Highest Point: Borah Peak at 12,662 feet
Lowest Point: Forest Boundary near Eightmile Canyon at 5,550 feet
Number of Named Peaks over 12,000 feet: 5
Number of Named Peaks over 11,000 feet: 20