{"nrhp_refnum":"07000144","name":"Fort Banks Mortar Battery","other_names":["Fort Banks"],"category":"site","location":{"address":"Kennedy Dr.","address_restricted":false,"city":"Winthrop","county":"Suffolk County","state":"MA","lat":42.39085805950006,"lon":-70.99079953553513,"geom_source":"nps_gis"},"listed_date":"2007-03-12","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture","Engineering","Military"],"significance_levels":["national"],"summary":{"what_it_is":"A semi-underground coastal artillery emplacement (Seacoast Mortar Battery) in Winthrop, Massachusetts, west of Kennedy Drive, originally built 1892-96 and heavily modified 1912-16 as the main feature of the former Fort Banks military reservation.","why_significant":"The nomination argues it is significant in architecture, engineering and military history. It is a modified \"Abbot Quad\" design, one of only six built, and the only one with triangular ammunition-handling room complexes. It is also the only mortar battery known to have been so extensively modified, with 1906-type batteries grafted onto the original design.","narrative":"Fort Banks Mortar Battery is a concrete coastal artillery emplacement in Winthrop, Massachusetts, once the main feature of a military reservation guarding Boston Harbor. Built in 1892-96 on a modified Abbot Quad plan, it has four large pits, two named Battery Sanford Kellogg and two Battery Benjamin Lincoln, linked by underground galleries and magazines. Major rebuilding in 1912-16 enlarged the pits and added new magazines, a degree of change not known at any other mortar battery. Surviving details include overhead shell conveyor rails, a Telautograph booth for sending firing orders, and triangular ammunition-handling rooms found only here. A separate protected switchboard from about 1920 also remains. Today the site is partly open and partly buried beneath public housing, a condominium complex and a field house. The town acquired it in 1966 and uses some tunnels for storage. Its engineering, design and military role underlie its recognition, with a period of significance of 1892-1966.","period_of_significance":"1892-1966","architect_builder":null,"architectural_style":null,"criteria":["A","C"],"status_note":"Partly exposed and partly buried under modern buildings; the town uses some rooms for storage of public works and civil defense equipment, and interior tunnels and magazines are described as in good condition.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:13:03.57436-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/31/7969/63796931/content/electronic-records/rg-079/NPS_MA/07000144.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/07000144/8589b5edb1-800.webp","url_1600":"https://nationalhistoricalregister.com/media/07000144/8589b5edb1-1600.webp","licence":"CC BY-SA 3.0","author":"Jameslwoodward","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Fort_Banks_Mortar_Battery_Winthrop_MA_01.jpg\" rel=\"noopener\">Jameslwoodward</a>, <a href=\"https://creativecommons.org/licenses/by-sa/3.0\" rel=\"license noopener\">CC BY-SA 3.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Fort_Banks_Mortar_Battery_Winthrop_MA_01.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/63796931","wikipedia":"https://en.wikipedia.org/wiki/Fort_Banks_Mortar_Battery","wikidata":"https://www.wikidata.org/wiki/Q5470771"},"indexable":true,"url":"https://nationalhistoricalregister.com/massachusetts/suffolk-county/fort-banks-mortar-battery-07000144/"}