{"nrhp_refnum":"07001037","name":"Crossover Island Light Station","other_names":[],"category":"structure","location":{"address":"Crossover Island","address_restricted":false,"city":"St. Lawrence","county":"St. Lawrence County","state":"NY","lat":44.49895891600005,"lon":-75.77800942699997,"geom_source":"nps_gis"},"listed_date":"2007-10-03","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Maritime History","Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"A 1.5-acre island light station on Crossover Island in the St. Lawrence River near Oak Point, St. Lawrence County, New York. It includes a cast-iron-clad brick lighthouse built in 1882, a keeper's cottage, boathouse, ice house, ash house and seawall.","why_significant":"The nomination argues the station is significant under maritime history and architecture for its role in the federal system of navigation aids on the St. Lawrence River in the nineteenth century. It is a self-sustaining off-shore light station complex, with a substantially intact Carpenter Gothic keeper's cottage. Its history closely parallels that of Rock Island Light Station, suggesting a regional station type.","narrative":"Crossover Island Light Station occupies a 1.5-acre island in the middle of the St. Lawrence River near Oak Point, New York, where large vessels cross between the Canadian and American channels. The complex was first built in 1847-48 and almost completely rebuilt in 1882. It includes a 37-foot brick tower clad in cast iron, a two-story Carpenter Gothic keeper's cottage, a boathouse, an ice house, a granite seawall and a small stone ash house, the only survivor from 1847. Soil for the island's trees and grass was carried over by boat, since the island began as bare rock. The station was designed to be self-sustaining during long periods of isolation. It was listed for its role in the nineteenth-century federal system of navigation aids and for its architecture. The light was deactivated in 1947, though the tower still serves as a daymark. The island is now a private seasonal retreat.","period_of_significance":"1847 - 1947","architect_builder":null,"architectural_style":"Carpenter Gothic (keeper's cottage); architectural classification on the form is listed as \"na\"","criteria":["A","C"],"status_note":"Lighthouse deactivated in 1947 but still serves as a daymark; the island is privately owned and used as a seasonal retreat. The ash house is in excellent condition, and the cottage retains its original room layout.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:51:53.728454-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/46/8914/28891446/content/electronic-records/rg-079/NPS_IL/07001037.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/07001037/c1eb75b942-800.webp","url_1600":"https://nationalhistoricalregister.com/media/07001037/c1eb75b942-1600.webp","licence":"Public domain","author":"Unknown authorUnknown author","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Crossoverisland.JPG\" rel=\"noopener\">Unknown authorUnknown author</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Crossoverisland.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/28891446","wikipedia":"https://en.wikipedia.org/wiki/Crossover_Island_Light","wikidata":"https://www.wikidata.org/wiki/Q5188764"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/st-lawrence-county/crossover-island-light-station-07001037/"}