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1987 Map of Eighteenmile Peak

Name: 1987 Topographic Map of Eighteenmile Peak
Creator: U.S. Geological Survey
Published: 1987
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1987

About this map

The Continental Divide snake across this high-altitude landscape where the borders of Beaverhead and Lemhi counties meet the Montana-Idaho state line. Dominated by the soaring profile of Eighteenmile Peak, the terrain is defined by deep drainage systems like Montana Canyon and Ramsey Canyon that feed into the larger river valleys below. The boundary between the Beaverhead National Forest and Targhee National Forest underscores the protected, wilderness character of this region during the 1980s.

Signs of historical prospecting are evident throughout the slopes, with several sites marked simply as Prospects or Prospect located near Cedar Gulch and Milo Canyon. These small-scale excavations, alongside features like Smelter Gulch, point to a legacy of mineral exploration in the remote backcountry. High-elevation water sources including Harkness Lakes and the headwaters of Nicholia Creek provide critical landmarks for navigating this complex topography of ridges and draws.