1988 Map of North Sister

About this map

The high Cascade peaks of North Sister and Middle Sister dominate this high-altitude landscape on the boundary of Lane and Deschutes counties. Mapped in the late 1980s, the terrain is defined by its active glacial and volcanic history, featuring the massive Collier Glacier and the distinct volcanic forms of Yapoah Crater and Four In One Cone. The Pacific Crest National Scenic Trail winds through the Ahalapam Cinder Field and past high-mountain waters like Matthieu Lakes. Of particular interest to local history researchers are the memorial markers placed in this remote wilderness, including the Prouty Memorial Plaque, Bronaugh Memorial Plaque, and Montague Memorial Plaque. The map also captures the headwaters of the White Branch and Obsidian Creek as they descend from the Obsidian Cliffs toward the lush Linton Meadows.