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2020 Map of Lost Trail Pass

Name: 2020 Topographic Map of Lost Trail Pass
Creator: U.S. Geological Survey
Published: 2020
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2020

About this map

Lost Trail Pass serves as a critical geographic and historical anchor along the Continental Divide, where the modern borders of Montana and Idaho converge. This 2020 survey illustrates the complex intersection of federal lands, including the Bitterroot National Forest, Salmon National Forest, and Beaverhead National Forest. Historically significant corridors such as the Lewis and Clark NHT and the Continental Divide National Scenic Trail follow the high ridges, tracing routes established long before modern surveying.

Thermal features like Gallogly Hot Springs and Gallogly Spring highlight the unique geology of the northern Rockies near Chief Joseph Pass. The landscape is defined by its drainage systems, with the N Fork Salmon River and its various tributaries, including Little Moose Cr and Pierce Creek, flowing through the steep terrain. Local landmarks like Saddle Mtn and Lewis and Clark Ridge remain key reference points for modern travelers and historians following the path of early explorers.