1920 Map of Slate Pass

About this map

The Cascade Range crest divides this high-altitude wilderness survey, where the Chancellor Power Plant stands as a rare industrial marker amidst the peaks. Established in the years following the 1918 forest surveys, this map documents the intricate drainage basins of the Pasayten River and Lightning Creek as they flow from the international boundary toward the interior. The landscape is defined by its critical mountain passages, including Slate Pass, Harts Pass, and Washington Pass, which historically served as the primary routes for miners and early forest rangers.