{"nrhp_refnum":"94000424","name":"Government Island Historic District","other_names":["Minot's Ledge Lighthouse Shore Station, Gulf Island","US Light"],"category":"district","location":{"address":"Border St.","address_restricted":false,"city":"Cohasset","county":"Norfolk County","state":"MA","lat":42.237967000000054,"lon":-70.78863634550558,"geom_source":"nps_gis"},"listed_date":"1994-05-12","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture","Maritime History","Engineering"],"significance_levels":["state","local"],"summary":{"what_it_is":"A 7.35-acre district on Government Island (formerly Gulf Island) in Cohasset Harbor, Cohasset, Massachusetts, made up of the remains of the shore station used to build and operate the second Minot's Ledge Lighthouse, developed between 1855 and 1860.","why_significant":"The district is a rare surviving mainland base for building and running an offshore wave-swept lighthouse. The island served as the staging area where granite blocks were cut and trial-fitted before being shipped to Minot's Ledge. It is significant for engineering, maritime history and architecture, and its resources are tied to Joseph G. Totten's design and Barton S. Alexander's supervision.","narrative":"Government Island, in Cohasset Harbor, holds the surviving shore station for the second Minot's Ledge Lighthouse, the oldest surviving lighthouse in the country built directly in the sea. Between 1855 and 1860 the island was the mainland base for the project. Granite blocks from Quincy were cut and trial-fitted here on two 30-foot circular stone platforms before boats carried them to the ledge. Captain Barton S. Alexander of the Corps of Engineers supervised the work from Joseph G. Totten's plans, and the crew finished without a death or serious injury. The district includes an engineer's office, a double house for assistant keepers, a brick oil house, a large granite wharf, and Beacon Rock, used for observation and signaling. The lighthouse's fog bell and its original watchroom were later moved to the island. Today the site serves as a public park, fishing landing and sailing club location, and it keeps the character of a mid-nineteenth-century engineering and residential facility.","period_of_significance":"1825-1947","architect_builder":"Totten, Joseph G.; Alexander, Barton S.","architectural_style":"No style","criteria":["A","C"],"status_note":"Now a town-owned park with a public fishing wharf and a sailing club. The engineer's office is used to store marine equipment and is in fair to good condition.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:13:05.1304-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/38/7964/63796438/content/electronic-records/rg-079/NPS_MA/94000424.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/94000424/632772db9d-800.webp","url_1600":"https://nationalhistoricalregister.com/media/94000424/632772db9d-1600.webp","licence":"CC BY-SA 4.0","author":"User:Magicpiano","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:CohassetMA_GovernmentIslandPark.jpg\" rel=\"noopener\">User:Magicpiano</a>, <a href=\"https://creativecommons.org/licenses/by-sa/4.0\" rel=\"license noopener\">CC BY-SA 4.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:CohassetMA_GovernmentIslandPark.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/63796438","wikipedia":"https://en.wikipedia.org/wiki/Government_Island_Historic_District","wikidata":"https://www.wikidata.org/wiki/Q5588929"},"indexable":true,"url":"https://nationalhistoricalregister.com/massachusetts/norfolk-county/government-island-historic-district-94000424/"}