1961 Map of Petersburg D-1

About this map

Tongass National Forest dominates this Alaskan landscape, where massive ice fields and moving glaciers define the terrain at the edge of the international border. The survey documents the expansive reach of the Le Conte Glacier in the northwest and the Shakes Glacier toward the south, which feeds into the prominent Shakes Lake. These glacial systems are interspersed with significant peaks including Mount Pratt and Castle Mountain, illustrating the high-elevation relief of the Coast Mountains. The map specifically delineates the political boundary between the United States and Canada, marked by Boundary Peak 69. This 1960s-era data, compiled from aerial photography, captures the intricate relationship between the high Summit ice fields and the Popof Glacier before modern decades of glacial recession began to significantly alter these landmarks.