American Seacoast Defenses
Forts, Military Reservations and Batteries 1794-1945
Printable list of First, Second and Third System Forts e (123list.pdf)
Printable list of Modern (1890-1945) Defenses, (NEW revised January 2017)
Army Map Symbol Key (symbols.pdf)
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Maps available for download
MAPS: A set of PDF files of Army maps for the 1920s & 1930s are linked to each Harbor Defense listing. Click the links to download. All maps and drawings on this site came from copies of materials in the holdings of the National Archives of the United States. Keys to the identification of the symbols may be downloaded here: Map Symbol Key.
Follow the links on the pages for more information on the harbor defenses from CDSG, FortWiki, and other websites