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1986 Map of Reas Pass

Name: 1986 Topographic Map of Reas Pass
Creator: U.S. Geological Survey
Published: 1986
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1986

About this map

The Continental Divide serves as the spine of this mid-1980s provisional survey, marking the high-altitude boundary between the Gallatin National Forest in Montana and the Targhee National Forest in Idaho. At the heart of this landscape lies Reas Pass, a critical point of passage through the mountainous terrain. The map traces the winding course of the Madison River and its South Fork Madison River, which drain the eastern slopes near the Fremont and Gallatin county line.

Transportation and utility infrastructure are visible through the Old Railroad Grade and a remote Radio Facility, providing evidence of the human engineering required to navigate these heights. The hydrology of the region is further defined by several steep drainages, including Moose Creek, Black Canyon Creek, and Pine Creek, which carve into the prominent Plateau and deep-cut features like Black Bear Canyon.