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1941 Map of Casco Bay
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1941 Map of Casco Bay

USGS Topo · Published 1941

About this map

The harbor defenses of Portland dominate this 1941 tactical map, featuring a chain of coastal fortifications including Fort McKinley, Fort Gorges, and Fort Preble. Revised from aerial photography just before the United States' entry into World War II, the sheet illustrates the strategic significance of the islands and headlands protecting Portland and South Portland. Maritime safety is marked by several primary beacons, from the Portland Head Lighthouse at Fort Williams to the isolated Halfway Rock Lighthouse and the Portland Lightship stationed far offshore.

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Map Details

Date Portrayed1941
Date Published1941
PublisherU.S. Geological Survey
Map TypeTopographic
Scale1:62,500
Physical Dimensions15.2 x 21.3 inches

Editions of this 1941 Casco Bay Map

This is the sole edition of this map. No revisions or reprints were ever made.

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Source Details

SourceU.S. Geological Survey
CopyrightPublic Domain