2024 Map of Reas Pass

About this map

The Continental Divide serves as the central spine of this high-altitude landscape, demarcating the border between Idaho and Montana. This wilderness area is defined by the convergence of the Gallatin National Forest and Targhee National Forest, where the headwaters of the South Fork Madison River and Thirsty Creek originate. The presence of the Railroad Right-Of-Way Trl indicates a historical transportation corridor that once utilized Reas Pass to navigate the Henrys Lake Mountains. This former rail grade, now repurposed for recreation, parallels Reas Pass Creek through the steep-walled Black Canyon. Along the eastern edge, the Moose Creek Plateau and Black Bear Canyon illustrate the complex drainages and high plateaus that characterize this section of the Rocky Mountains. The Continental Divide National Scenic Trl offers a modern route through this historically difficult mountain crossing.