1961 Map of Sumdum C-3

About this map

Dawes Glacier and South Sawyer Glacier dominate this remote Alaskan landscape, where massive ice fields flow toward the tidewaters of Endicott Arm. This 1961 survey, published by the U.S. Geological Survey in 1973, provides a detailed record of glacial extent and elevation within the Tongass National Forest before more modern shifts in the shoreline occurred. The map also delineates the international border between British Columbia and Alaska, punctuated by Boundary Peak 76. To the north, the ice of Brown Glacier moves through high alpine valleys, illustrating the complex drainage patterns of the region's ice fields. For researchers of glacial change or the history of the Alaska-Canada boundary, these 100-foot contour lines and photogrammetric records offer a precise baseline of mid-century coastal ice movements.