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2013 Map of Reas Pass

Name: 2013 Topographic Map of Reas Pass
Creator: U.S. Geological Survey
Published: 2013
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2013

About this map

Reas Pass defines the high-altitude divide between Montana and Idaho, serving as a focal point for this survey of the northern Henrys Lake Mountains. This landscape is dominated by the vast protected reaches of Gallatin National Forest and Targhee National Forest, where the headwaters of the S Fork Madison River and Reas Pass Cr emerge from the steep drainages. The topography reflects a wilderness managed for both conservation and forestry, with several named landmarks indicating human activity and fire management.

Evidence of historical presence and forest infrastructure is found at Whitmans Cabin and the Big Springs Lookout. A network of access routes, including Divide Crossing Rd and the Natl Forest Develop Road 113 Trl, underscores the remote but established logistical system used to monitor these highlands. The terrain transitions from the high Moose Creek Plateau to dramatic cuts like Black Bear Canyon and Mosquito Gulch, illustrating the complex drainage patterns of the Continental Divide.