1961 Map of Petersburg D-1

About this map

Tongass National Forest dominates this Alaskan landscape, characterized by a massive network of active ice flows and alpine peaks. The glacial system is anchored by the Le Conte Glacier and the expansive Shakes Glacier, which terminates near the waters of Shakes Lake. This 1961 survey, based on aerial photography from the late 1940s and early 1960s, documents the international boundary between Alaska and British Columbia. High-elevation landmarks such as Mount Pratt, Castle Mountain, and Boundary Peak 69 7329 serve as the primary navigational points along the jagged United States-Canada border. Smaller flows like Summit Glacier and Popof Glacier further illustrate the dense ice coverage that defines this uninhabited wilderness.