{"nrhp_refnum":"99001579","name":"Philadelphia Naval Shipyard Historic District","other_names":["Naval Base Philadelphia","League Island Navy Yard"],"category":"district","location":{"address":"S. Broad St.","address_restricted":false,"city":"Philadelphia","county":"Philadelphia","state":"PA","lat":39.89170479850006,"lon":-75.18052273364873,"geom_source":"nps_gis"},"listed_date":"1999-12-22","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Military","Architecture","Engineering"],"significance_levels":["national"],"summary":{"what_it_is":"A 482-acre historic district at the south end of Broad Street in Philadelphia, Pennsylvania, on the Delaware River, formerly the Philadelphia Naval Shipyard, made up of shipyard, naval aircraft factory, laboratory, receiving station and Marine Corps reservation sections.","why_significant":"The nomination argues the district served as a major Navy ship repair, construction and overhaul facility and as a center for naval aviation and Marine Corps training. It also cites buildings that display distinctive period architecture and industrial construction. The period of significance runs from 1873, when the first permanent building was begun, to 1945.","narrative":"Occupying about 482 acres at the south end of Broad Street on the Delaware River in Philadelphia, this former Navy yard grew from a nineteenth-century core into a complex of shops, dry docks, piers, barracks and warehouses. The first permanent building, a Yard and Dock storehouse, was begun in 1873 and completed in 1875. The yard was founded on League Island, a marshy tract acquired in 1868, and it expanded through a dredging and fill program. Its significance rests on its role in Navy shipbuilding and repair, on the Naval Aircraft Factory, which built flying boats during the First World War, and on the Naval Boiler and Turbine Laboratory, a propulsion research center. It was also home to the Marine Corps Reservation, which included barracks and Georgian Revival officers' quarters. The district includes buildings in Beaux Arts, Renaissance Revival, Italianate and Second Empire styles, and its period of significance ends in 1945. The Navy yard closed in 1995.","period_of_significance":"1873-1945","architect_builder":null,"architectural_style":"Georgian Revival, Renaissance Revival, Beaux Arts, vernacular Victorian, Italianate, Second Empire, modern industrial design","criteria":["A","C"],"status_note":"Closed in 1995 according to the Statement of Significance; oil storage structures were recently removed.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:36.532877-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/99001579.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/99001579/f2edccf13f-800.webp","url_1600":"https://nationalhistoricalregister.com/media/99001579/f2edccf13f-1600.webp","licence":"Public domain","author":"Unknown authorUnknown author","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Aerial_view_of_the_Philadelphia_Naval_Shipyard_Reserve_Basin_on_19_May_1955_(80-G-668655).jpg\" rel=\"noopener\">Unknown authorUnknown author</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Aerial_view_of_the_Philadelphia_Naval_Shipyard_Reserve_Basin_on_19_May_1955_(80-G-668655).jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71997526","wikipedia":"https://en.wikipedia.org/wiki/Philadelphia_Naval_Shipyard","wikidata":"https://www.wikidata.org/wiki/Q1548690"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/philadelphia/philadelphia-naval-shipyard-historic-district-99001579/"}