{"nrhp_refnum":"83001682","name":"Galloo Island Light","other_names":[],"category":"building","location":{"address":"Galloo Island","address_restricted":false,"city":"Sackets Harbor","county":"Jefferson County","state":"NY","lat":43.888499876000026,"lon":-76.44413797899995,"geom_source":"nps_gis"},"listed_date":"1983-08-04","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Commerce","Transportation","Architecture"],"significance_levels":["state"],"summary":{"what_it_is":"A lighthouse station on the southwest end of Galloo Island in eastern Lake Ontario, near Sackets Harbor, Jefferson County, New York. The present conical stone tower and attached keeper's dwelling were completed in spring 1867, replacing a light first established in 1820.","why_significant":"The light marks the outer edge of a group of islands and shoals at the lower end of Lake Ontario, on the approach to the St. Lawrence River and Sackets Harbor. It is part of a thematic group of Great Lakes Coast Guard lighthouses. The reviewer's recommended criteria were A and C. A handwritten note calls it one of the oldest surviving American lighthouses on Lake Ontario.","narrative":"Galloo Island Light is a lighthouse on the southwest end of Galloo Island in eastern Lake Ontario, marking the outer edge of a group of islands and shoals before the St. Lawrence River and Sackets Harbor. A light was first established here in 1820, and the present station was completed in the spring of 1867. The 60-foot conical tower and its attached one-story keeper's dwelling are built of cut grey limestone quarried on the island. The tower is lined with brick and holds a circular cast-iron stairway with two landings, topped by a ten-sided lantern and a bracketed gallery with an iron railing. It once held a fourth-order Fresnel lens; today a battery-driven rotating beacon flashes white every five seconds. Nearby are an 1897 iron oil house and an 1897 brick fog signal house built from the same plans as one at Tibbetts Point. Automated in 1974, the light remains in service as part of a group of Great Lakes lighthouses.","period_of_significance":null,"architect_builder":null,"architectural_style":null,"criteria":["A","C"],"status_note":"Still an active coast light under U.S. Coast Guard ownership, automated in 1974. Interior, exterior and environs are marked intact.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:43.487559-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/76/8911/28891176/content/electronic-records/rg-079/NPS_IL/83001682.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/83001682/21e194d40f-800.webp","url_1600":"https://nationalhistoricalregister.com/media/83001682/21e194d40f-1600.webp","licence":"Public domain","author":"Unknown authorUnknown author","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Gallooisland.JPG\" rel=\"noopener\">Unknown authorUnknown author</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Gallooisland.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/28891176","wikipedia":"https://en.wikipedia.org/wiki/Galloo_Island_Light","wikidata":"https://www.wikidata.org/wiki/Q5519133"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/jefferson-county/galloo-island-light-83001682/"}