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1966 Map of Big Hole Pass

Name: 1966 Topographic Map of Big Hole Pass
Creator: U.S. Geological Survey
Published: 1970
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1970

About this map

The Continental Divide defines the spine of this mid-1960s survey, marking the boundary between the Salmon National Forest in Idaho and the Beaverhead National Forest in Montana. The landscape is dominated by high-altitude drainages and peaks, notably Morgan Mtn, where numerous unnamed prospects suggest a history of mineral exploration. Remote alpine waters like Morgan Jones Lake feed into a network of steep canyons, including Thompson Gulch and Dahlonega Creek.

Transportation through this high-country terrain in the 1960s was limited to primitive routes. A Pack Trail follows the ridgelines, while Jeep Trails provide access to the various mining claims scattered throughout the basin. The map documents the convergence of several major creeks, such as Nez Perce Creek and Pioneer Creek, which shape the drainage patterns for both Lemhi County and Beaverhead County.