{"nrhp_refnum":"05000778","name":"Garnett Creek Bridge on Greenwood Avenue","other_names":["Bridge No. 21CO042"],"category":"structure","location":{"address":"Greenwood Ave., 0.2 mi. NE of Grant Ave.","address_restricted":false,"city":"Calistoga","county":"Napa County","state":"CA","lat":38.60339523500005,"lon":-122.58938227599998,"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 stone masonry arch bridge carrying Greenwood Avenue over Garnett Creek, 0.2 miles northeast of Grant Avenue near Calistoga, Napa County, California. It was built in 1904.","why_significant":"The bridge is significant under Criterion C in the area of engineering at the local level, as a fine, essentially unaltered example of a rare bridge type in California, the masonry arch. It was designed by Napa County Surveyor O.H. Buckman, whose designs account for the abundance of masonry arch bridges in Napa County. It retains a high degree of integrity of design and setting.","narrative":"Garnett Creek Bridge carries Greenwood Avenue over Garnett Creek northeast of Grant Avenue, near Calistoga in Napa County. Built in 1904, it is an earth-filled, closed spandrel masonry arch with a single 32-foot span. The two-lane bridge is 50 feet long and about 20.7 feet wide, made of rough-cut stone laid in irregular courses, with cut-stone railings. Trees and fields surround it. County Surveyor O.H. Buckman designed the bridge, and contractor John C. Money built it for $2,390. Buckman's designs are the main reason Napa County has so many masonry arch bridges, helped by nearby quality building stone and skilled stonemasons. Caltrans maintenance files indicate only routine upkeep since construction, and the bridge keeps its original appearance. It was listed for its engineering significance as a well-preserved example of a masonry arch, a bridge type that is rare in California, and it continues to serve vehicle traffic.","period_of_significance":"1904","architect_builder":"Buckman, O.H (designer); Money, John C. (contractor)","architectural_style":"Other: Masonry Arch Bridge","criteria":["C"],"status_note":"Structure appears essentially unaltered since 1904, with only routine maintenance; still used for vehicular traffic.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:54:29.767566-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_CA/05000778.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/05000778/a52c83a570-800.webp","url_1600":"https://nationalhistoricalregister.com/media/05000778/a52c83a570-1600.webp","licence":"CC BY-SA 3.0","author":"Sanfranman59","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Garnett_Creek_Bridge_on_CA_29,_postmile_39.08,_Calistoga,_CA_10-22-2011_3-50-20_PM.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:Garnett_Creek_Bridge_on_CA_29,_postmile_39.08,_Calistoga,_CA_10-22-2011_3-50-20_PM.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/123857690","wikipedia":null,"wikidata":"https://www.wikidata.org/wiki/Q113558051"},"indexable":true,"url":"https://nationalhistoricalregister.com/california/napa-county/garnett-creek-bridge-on-greenwood-avenue-05000778/"}