1963 Map of Cascade Pass

About this map

Diamond Mine and the Black Warrior Mine sit within the high elevations of the North Cascades, marking the industrial reach into this wilderness during the mid-20th century. The terrain is defined by the convergence of the Mount Baker, Wenatchee, and Okanogan National Forests. Glacial activity is a dominant feature, with the Boston Glacier and Spider Glacier shaping the granite peaks of Boston Peak and Sahale Mtn. The watershed is carved by the three forks of the Cascade River, with the Middle Fork and South Fork draining the snowfields of Mount Formidable and Spider Mtn. High alpine water bodies like Doubtful Lake and the Yang Yang Lakes are captured in their remote basins, providing a clear record of the area's hydrology and topography as it was field-checked in 1963.