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2017 Map of Reas Pass

Name: 2017 Topographic Map of Reas Pass
Creator: U.S. Geological Survey
Published: 2017
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2017

About this map

The Continental Divide serves as the focal point of this high-altitude landscape, doubling as the border between Fremont County, Idaho, and Gallatin County, Montana. The terrain is defined by dramatic elevation changes, moving from the Henrys Lake Mountains in the west toward the expansive Moose Creek Plateau in the southeast. Water drainage patterns are clearly dictated by the divide, with the S Fork Madison River and Mosquito Gulch flowing through the north, while Thirsty Cr and Reas Pass Cr drain the southern slopes.

Industrial and transit history is evidenced by the Railroad-Reas Pass alignment, which once navigated this challenging topography to connect disparate mountain regions. The map illustrates a strictly managed wilderness, split between Gallatin National Forest and Targhee National Forest. Local landmarks such as Black Bear Canyon and Dry Canyon highlight the erosional features of this subalpine environment, which remains largely defined by its natural barriers and sparse forest road network including S Fork Rd and Divide Crossing Rd.