{"nrhp_refnum":"89000501","name":"Lloyd Harbor Lighthouse","other_names":[],"category":"structure","location":{"address":"Entrance to Lloyd Harbor","address_restricted":false,"city":"Lloyd Harbor","county":"Suffolk County","state":"NY","lat":40.91101237400005,"lon":-73.43126184199997,"geom_source":"nps_gis"},"listed_date":"1989-05-31","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Engineering"],"significance_levels":["national"],"summary":{"what_it_is":"A reinforced-concrete lighthouse with an attached one-story dwelling, standing on a concrete crib foundation at the entrance to Lloyd Harbor and Huntington Harbor on Long Island's north shore, Suffolk County, New York. It was built in 1912 by Chas. Mead & Co.","why_significant":"The nomination argues it is one of the earliest reinforced-concrete lighthouses in the nation, and perhaps the earliest on the East Coast (Criterion C). It also represents the maritime heritage of Long Island's north shore. Its sheltered location made it a suitable site for testing concrete, and it likely helped establish the material's fitness for later lighthouses.","narrative":"Lloyd Harbor Lighthouse is a reinforced-concrete light station at the entrance to Lloyd and Huntington harbors on Long Island's north shore, completed in 1912. A two-story tower topped by an octagonal iron lantern rises from the east side of a single-story dwelling with round-arched windows and a parapet. Both sit on a concrete crib foundation that was poured on shore, towed about half a mile, and sunk onto a leveled sand bottom before being filled with concrete. The lighthouse is noted as one of the earliest reinforced-concrete lighthouses in the country, and perhaps the first on the East Coast, at a time when iron caissons were the usual choice for shoal sites. Its sheltered position behind Lloyd Neck allowed officials to try the material with limited risk to shipping. It also reflects the small-harbor shipping and fishing of the north shore. Interior woodwork and the cast-iron stair survive, though cracking and plaster damage have been recorded.","period_of_significance":"1912","architect_builder":"Chas. Mead & Co. - Builder","architectural_style":"Other: reinforced concrete lighthouse","criteria":["C"],"status_note":"Used as a Coast Guard facility and lighthouse. The structure shows cracking, spalled cornice molding, deteriorated plaster and a rotted floor in one room, and the original illuminating equipment has been replaced by a modern plastic beacon.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:44.767946-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/89000501.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/89000501/0ae508b1ad-800.webp","url_1600":"https://nationalhistoricalregister.com/media/89000501/0ae508b1ad-1600.webp","licence":"Public domain","author":"Unknown authorUnknown author","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Lloydharbor.JPG\" rel=\"noopener\">Unknown authorUnknown author</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Lloydharbor.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75322164","wikipedia":"https://en.wikipedia.org/wiki/Huntington_Harbor_Light","wikidata":"https://www.wikidata.org/wiki/Q5945338"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/suffolk-county/lloyd-harbor-lighthouse-89000501/"}