{"nrhp_refnum":"05000779","name":"Carneros Creek Bridge on Old Sonoma Road","other_names":["21co017"],"category":"structure","location":{"address":"Old Sonoma Rd., 0.2 mi. NE of CA 12/121","address_restricted":false,"city":"Napa","county":"Napa County","state":"CA","lat":38.25664191100003,"lon":-122.34046249599999,"geom_source":"nps_gis"},"listed_date":"2005-08-05","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Engineering"],"significance_levels":["local"],"summary":{"what_it_is":"A single-span, earth-filled, closed-spandrel masonry arch bridge carrying Old Sonoma Road over Carneros Creek, 0.2 miles northeast of State Highway 12/121 in Napa County, California. It was built in 1896 and is about 35 feet long and 28.5 feet wide.","why_significant":"The bridge is a fine example of a rare bridge type in California, the masonry arch, and is listed under Criterion C in the area of engineering at the local level. It reflects Napa County's continued use of stone arch construction after most of California had moved to metal trusses. It retains a high degree of integrity, including design and setting.","narrative":"Carneros Creek Bridge carries Old Sonoma Road over Carneros Creek in Napa County, California. It is a single-span, earth-filled masonry arch of square-cut stone laid in regular courses, roughly 35 feet long and 28.5 feet wide, set in a rural landscape of trees and fields. Napa County commissioned it in 1895, and Newman E. Wing designed and built it in 1896 for $3,327.25. In 1914 the bridge was widened to a design by county engineer O.H. Buckman, using stone from the original quarry and moving much of the original parapet railing. Napa County kept building stone bridges long after most of California turned to metal trusses, helped by good local stone and skilled stonemasons. The bridge was found eligible under Criterion C in a 1980s statewide bridge survey and again in a 2002 update. It is valued as a fine example of a rare bridge type that retains its integrity of design and setting.","period_of_significance":"1896","architect_builder":"Wing, Newman E. (designer); Wing, Newman E. (contractor)","architectural_style":"Other: Masonry Arch Bridge","criteria":["C"],"status_note":"Still in vehicular road use; the form states the bridge retains its original appearance for all intents and purposes.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:54:29.749757-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_CA/05000779.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/05000779/26515499a5-800.webp","url_1600":"https://nationalhistoricalregister.com/media/05000779/26515499a5-1600.webp","licence":"CC BY-SA 3.0","author":"Sanfranman59","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Carneros_Creek_Bridge,_Old_Sonoma_Rd.,_Napa,_CA_9-5-2010_11-54-35_AM.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:Carneros_Creek_Bridge,_Old_Sonoma_Rd.,_Napa,_CA_9-5-2010_11-54-35_AM.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/123857684","wikipedia":null,"wikidata":"https://www.wikidata.org/wiki/Q110493151"},"indexable":true,"url":"https://nationalhistoricalregister.com/california/napa-county/carneros-creek-bridge-on-old-sonoma-road-05000779/"}