{"nrhp_refnum":"11000237","name":"Port Chicago Naval Magazine National Memorial","other_names":[],"category":"district","location":{"address":"4202 Alhambra Ave.","address_restricted":false,"city":"Martinez","county":"Contra Costa County","state":"CA","lat":37.992016927000066,"lon":-122.13067924099994,"geom_source":"nps_gis"},"listed_date":"2009-10-28","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":[],"significance_levels":["national"],"summary":{"what_it_is":"Port Chicago Naval Magazine National Memorial is a district at 4202 Alhambra Ave., Martinez, Contra Costa County, California, listed on the National Register on 2009-10-28.","why_significant":"The supplied document is only an administrative locator card marked as an automatic listing with undocumented NPS status. It gives no statement of significance, so the reasons for listing are not described.","narrative":"Port Chicago Naval Magazine National Memorial is a historic district located at 4202 Alhambra Avenue in Martinez, Contra Costa County, California. It was listed on the National Register of Historic Places on October 28, 2009, under reference number 11000237. The record available here is an administrative locator card rather than a full nomination, and it is flagged as an automatic listing with undocumented National Park Service status. Because of that, the card contains no physical description of the site, no construction dates, no named designers or builders, and no explanation of the events or themes behind its recognition. Only the name, address, county, listing date and category can be confirmed from this material. Anyone seeking details on the district's history, boundaries or condition would need to consult other source documentation, since none is included in this record.","period_of_significance":null,"architect_builder":null,"architectural_style":null,"criteria":[],"status_note":null,"vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:54:29.733329-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_CA/11000237.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/11000237/0b7b585c25-800.webp","url_1600":"https://nationalhistoricalregister.com/media/11000237/0b7b585c25-1600.webp","licence":"Public domain","author":"NPS Photo","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Port_Chicago_Naval_Magazine_National_Memorial_(1e953372-9f9b-f9fa-8f4b-f8baf01b99fe).jpg\" rel=\"noopener\">NPS Photo</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Port_Chicago_Naval_Magazine_National_Memorial_(1e953372-9f9b-f9fa-8f4b-f8baf01b99fe).jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/123858559","wikipedia":"https://en.wikipedia.org/wiki/Port_Chicago_Naval_Magazine_National_Memorial","wikidata":"https://www.wikidata.org/wiki/Q7230541"},"indexable":true,"url":"https://nationalhistoricalregister.com/california/contra-costa-county/port-chicago-naval-magazine-national-memorial-11000237/"}