{"nrhp_refnum":"75000225","name":"HERCULES (tugboat)","other_names":["Tugboat HERCULES","HERCULES (tugboat) National Historic Landma"],"category":"structure","location":{"address":"Maritime Unit, Hyde St. Pier, National Maritime Museum","address_restricted":false,"city":"San Francisco","county":"San Francisco","state":"CA","lat":37.80996082300004,"lon":-122.422249422,"geom_source":"nps_gis"},"listed_date":"1975-01-17","is_nhl":true,"nhl_designated_date":"1986-01-17","areas_of_significance":["Industry","Commerce","Engineering","Transportation"],"significance_levels":["national","state"],"summary":{"what_it_is":"A steel-hulled tugboat, 139 feet 9 inches long, built in 1906-07 by John H. Dialogue and Son in Camden, New Jersey, and now part of the fleet at San Francisco Maritime State Historic Park in San Francisco, California.","why_significant":"The nomination presents the tug as one of the finest examples of American tugboat design from the height of the towing industry. It towed her sister ship Goliah from New Jersey to San Francisco around the Horn, about 6,000 miles, and later towed canal locks built in San Francisco to the Panama Canal zone. Its significance is stated in the areas of commerce and industry.","narrative":"Hercules is a steel tugboat, 139 feet 9 inches long with a 26-foot beam, built in 1906-07 at the Camden, New Jersey, shipyard of John H. Dialouge and Son, a firm known for tugs. After her delivery voyage around Cape Horn to San Francisco, towing her sister ship Goliah some 6,000 miles, she worked towing lumber rafts from the Columbia River to San Diego. During construction of the Panama Canal she towed canal locks fabricated in San Francisco to the canal zone. In 1941 she was sold to the Western Pacific Railroad and shuttled car floats across San Francisco Bay; her pilot house was raised one level for that work. Her engine room was altered to convert from coal to diesel. The nomination calls her among the best examples of the American towing industry at its height, significant for commerce and industry. She is now part of the fleet of San Francisco Maritime State Historic Park and is considered a candidate for full restoration.","period_of_significance":"1906-07","architect_builder":"John H. Dialouge and Son, Camden, New Jersey","architectural_style":null,"criteria":[],"status_note":"Described as deteriorated from lack of active operation, with minor vandalism in the engine, but mechanically capable of operation with minor adjustment. On loan to the State of California with an option to buy, and part of the park's fleet.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:31.655214-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_CA/75000225.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/75000225/f2ba5c4dd1-800.webp","url_1600":"https://nationalhistoricalregister.com/media/75000225/f2ba5c4dd1-1600.webp","licence":"CC BY-SA 3.0","author":"Sanfranman59","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Hercules_(steam_tug,_San_Francisco).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:Hercules_(steam_tug,_San_Francisco).JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/123861157","wikipedia":"https://en.wikipedia.org/wiki/Hercules_(1907_ship)","wikidata":"https://www.wikidata.org/wiki/Q5736409"},"indexable":true,"url":"https://nationalhistoricalregister.com/california/san-francisco/hercules-tugboat-75000225/"}