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1989 Map of Twin Peaks

Name: 1989 Topographic Map of Twin Peaks
Creator: U.S. Geological Survey
Published: 1989
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1989

About this map

The high ridges of Twin Peaks dominate this 1980s topographic landscape, situated along the boundary of Lemhi and Custer Counties. This terrain is characterized by the expansive Challis National Forest and the protected acreage of the Frank Church River of No Return Wilderness. The map captures a high-altitude network of drainage systems, including Challis Creek and the headwaters of Bear Creek, which feed into Mosquito Flat Reservoir in the southern portion of the quadrangle.

A Lookout Heliport sits atop one of the peaks, reflecting the area's ongoing management and fire-monitoring infrastructure. For researchers and geographers, the map provides detailed placement of remote landmarks like Corkscrew Mountain and Pine Summit, alongside isolated water bodies such as Twin Lakes and Spruce Gulch Lake. The prevalence of 4WD tracks and trails suggests a landscape accessed primarily for forestry and wilderness recreation.