{"nrhp_refnum":"98001243","name":"Riverview Union High School Building","other_names":["Riverview Fire Protection District Headquarters"],"category":"building","location":{"address":"1500 W. 4th St.","address_restricted":false,"city":"Antioch","county":"Contra Costa County","state":"CA","lat":38.01560202400003,"lon":-121.82657145199994,"geom_source":"nps_gis"},"listed_date":"1998-10-14","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Invention","Education"],"significance_levels":["local"],"summary":{"what_it_is":"A two-story red brick Renaissance Revival high school building at 1500 West 4th Street, Antioch, Contra Costa County, California, designed by Cumming and Weymouth of Oakland and dedicated in November 1911.","why_significant":"The nomination argues local significance under Criterion A for education, as one of the first purpose-built high school buildings in eastern Contra Costa County and its only remaining original union high school building. It is also significant for invention, because Fibreboard Products used it as a research division where several inventions that aided World War II were developed.","narrative":"Built in 1910-1911 on land donated by C. A. Hooper between Antioch and Pittsburg, this two-story brick building served the Riverview Union High School District. Cumming and Weymouth of Oakland designed it in the Renaissance Revival style, with a balanced facade, a Corinthian-columned portico, pre-cast concrete quoins and keystone lintels. The Continental Fireproofing Company built it. It housed high school classes until 1931, and the nomination calls it the only surviving original union high school building in eastern Contra Costa County. The Bureau of Reclamation leased it in 1936 for engineers on the Central Valley Project. In the 1940s Fibreboard Products bought it for a research division, where inventions tied to the World War II effort were developed, including an underwater pen for frogmen and waxed packaging. The fire protection district owned it from 1975 to 1995. The building is now vacant, and the nomination notes its future is uncertain.","period_of_significance":"1910 - 1948","architect_builder":"Cumming and Weymouth, Architects; Continental Fireproofing Company","architectural_style":"Late 19th & 20th Century Revivals (Renaissance Revival)","criteria":["A"],"status_note":"The building was used by the Riverview Fire Protection District until 1995 and is now vacant, with an uncertain future if sold.","vacant_flag":true,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:54:26.942295-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_CA/98001243.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/98001243/b570fdb158-800.webp","url_1600":"https://nationalhistoricalregister.com/media/98001243/b570fdb158-1600.webp","licence":"CC BY-SA 3.0","author":"Sanfranman59","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Riverview_Union_High_School_(Antioch,_CA).JPG\" rel=\"noopener\">Sanfranman59</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:Riverview_Union_High_School_(Antioch,_CA).JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/123858565","wikipedia":"https://en.wikipedia.org/wiki/Riverview_Union_High_School_Building","wikidata":"https://www.wikidata.org/wiki/Q7338781"},"indexable":true,"url":"https://nationalhistoricalregister.com/california/contra-costa-county/riverview-union-high-school-building-98001243/"}