2014 Map of Lost Trail Pass

About this map

Lost Trail Pass and Chief Joseph Pass serve as the primary gateways across the Continental Divide on this 2014 survey of the high country straddling the Montana and Idaho border. The terrain is defined by the intersections of the Bitterroot National Forest, Beaverhead National Forest, and Salmon National Forest. This landscape is marked by historical transit corridors including Lewis and Clark Ridge and the old Gibbons Pass Rd, following the path through Gibbons Pass. Water is a defining feature of these slopes, from the headwaters of the N Fork Salmon River and W Fork N Fork Salmon River to named points like Gallogly Spring and Cool Gulch. The complex political geography is visible in the converging lines of Ravalli, Beaverhead, and Lemhi counties, showing how modern US Hwy 93 navigates these established mountain crossings.