The Challis National Forest dominates the upper elevations of this terrain, where the peaks of the Lost River Range give way to a complex system of canyons and gulches. The landscape is defined by the transition from high mountain peaks like Invisible Mtn and Mahogany Gulch down into the expansive Big Lost River Valley. Human intervention in this arid environment is clearly marked by a sophisticated network of irrigation channels, including Fury Ditch, Hanson Ditch, Burnett Ditch, and Angelo Ditch, which redirect water from the mountain snowpack to the valley floor. These waterworks, alongside historic routes like the Bear-Wet Creek Trail and Pass Creek Rd, trace the legacy of ranching and land management in Custer and Butte counties. Small alpine features like Twin Lakes and Mud Lake provide essential water sources within the high-country drainage basins.
40 named features on this map. Tap any name to fly to it.
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This is the sole edition of this map. No revisions or reprints were ever made.
1935 · MacKay
USGS Topo · 1:96,000
1935 · Borah Peak
USGS Topo · 1:125,000
1938 · Borah Peak
USGS Topo · 1:125,000
1940 · Mackay
USGS Topo · 1:62,500
1955 · Dubois
USGS Topo · 1:250,000
1955 · Idaho Falls
USGS Topo · 1:250,000
1957 · Hawley Mountain
USGS Topo · 1:62,500
1958 · Dubois
USGS Topo · 1:250,000
1958 · Idaho Falls
USGS Topo · 1:250,000
1960 · Mackay
USGS Topo · 1:62,500