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1948 Map of Sumdum B-6

Name: 1948 Topographic Map of Sumdum B-6
Creator: U.S. Geological Survey
Published: 1957
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1957

About this map

Admiralty Island dominates the western half of this maritime survey, illustrating the complex coastline within the Tongass National Forest shortly after the war. The map documents a network of islands and deep-water inlets, including Gambier Bay and Pybus Bay, which served as critical sheltered waters for navigation. The presence of the Gambier Bay Entrance Light underscores the importance of maritime safety in these channels, where Stephens Passage and Frederick Sound converge.

Several smaller island groups such as The Brothers, comprising West Brother Island and East Brother Island, and the San Juan Islands are charted with precision. These features, along with landmarks like The Five Fingers and Sail Island, provide essential points of reference for researchers tracing historic shipping routes and coastal geography in Southeast Alaska. The topography shows various points and coves, such as Pt Pybus and Snug Cove, that defined the early mid-century coastal landscape.