{"nrhp_refnum":"07000306","name":"SS POMONA (Shipwreck)","other_names":[],"category":"site","location":{"address":"Fort Ross Cove, off Fort Ross Historic State Park","address_restricted":false,"city":"Jenner","county":"Sonoma County","state":"CA","lat":38.51030301900005,"lon":-123.24657792,"geom_source":"nps_gis"},"listed_date":"2008-01-31","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Transportation","Commerce","Engineering","Architecture","Historic - Non-Aboriginal"],"significance_levels":["national"],"summary":{"what_it_is":"A steel-hulled steam schooner shipwreck site in Fort Ross Cove, off Fort Ross Historic State Park near Jenner, Sonoma County, California. The SS Pomona was built in 1888 by the Union Iron Works in San Francisco and sank in 1908.","why_significant":"The nomination argues the wreck is an archaeological site that can answer questions about 19th-century steel shipbuilding, since Pomona was the second steel hull built by Union Iron Works and was intended for the merchant trade. About half the vessel remains intact and stable. The wreck can also support interpretation of Pacific coast maritime history for park rangers, historians and educators.","narrative":"Lying in 17 to 40 feet of water in Fort Ross Cove, off Fort Ross Historic State Park in Sonoma County, the SS Pomona is the wreck of a steel-hulled steam schooner. Union Iron Works of San Francisco built her in 1888. She measured 225 feet long and 33 feet wide, with three decks, two masts, a single propeller and a triple expansion steam engine. She carried passengers and freight along the Pacific coast for twenty years. On March 8, 1908, while traveling from San Francisco to Eureka, she struck a submerged pinnacle off Monterey Reef and sank about half a mile south of Fort Ross. Today her hull and machinery rest on a boulder-strewn bottom thick with marine life, and nearly half the vessel survives despite earlier salvage. The listing rests on her research value: she was the second steel hull built by Union Iron Works, and her remains may reveal details of early steel shipbuilding, including riveting patterns and construction methods, as well as the coastal trade she served.","period_of_significance":null,"architect_builder":"Built by San Francisco Union Iron Works; plans by Irving M. Scott, Jr. (listed as Chief Draughtsman)","architectural_style":"Other: Steam Schooner","criteria":[],"status_note":"Wreck lies in 17 to 40 feet of water; the steel hull and machinery are well preserved and stable, with almost fifty percent of the vessel intact despite prior salvage.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:54:29.623914-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_CA/07000306.pdf"},"photo":null,"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/123862136","wikipedia":null,"wikidata":null},"indexable":true,"url":"https://nationalhistoricalregister.com/california/sonoma-county/ss-pomona-shipwreck-07000306/"}