1988 Map of North Sister

About this map

North Sister and Middle Sister dominate this high-altitude landscape along the boundary of Lane and Deschutes counties. The 1988 survey documents a region defined by active geological features and mountaineering history, including the expansive Collier Glacier and several smaller ice masses like the Hayden Glacier and Renfrew Glacier. Human history is marked by isolated memorials and shelters, such as the Craig Grave near the northern boundary and the Bronaugh Memorial Plaque situated near Obsidian Falls. The terrain is characterized by dramatic volcanic formations, including the Four In One Cone, Collier Cone, and the Ahalapam Cinder Field. This map serves as a detailed record of the high Cascades before the significant glacial recession of the late 20th century, tracing the route of the Pacific Crest National Scenic Trail as it passes through the Three Sisters Wilderness.