{"nrhp_refnum":"82003614","name":"Grand Lake St. Marys Lighthouse","other_names":[],"category":"structure","location":{"address":"Grand Lake St. Marys-Northwood Addition","address_restricted":false,"city":"Celinda","county":"Mercer County","state":"OH","lat":40.543542701000035,"lon":-84.48134461899997,"geom_source":"nps_gis"},"listed_date":"1982-06-02","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Landscape Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"A decorative lighthouse on the north shore of Grand Lake St. Marys in the Northwood Addition, near Celina in Mercer County, Ohio, built in 1923. It is a copy of the Eddystone Lighthouse in the English Channel.","why_significant":"The nomination argues it is architecturally significant because it is the only lighthouse in landlocked western Ohio. It is primarily ornamental and stands on what was formerly the largest man-made lake in the country. It was built after the lake's use as a reservoir for the Miami-Erie Canal had ended.","narrative":"Rising from a wooded point on the north shore of Grand Lake St. Marys, this lighthouse sits in the Northwood Addition between Celina and St. Marys in western Ohio. Built in 1923, it copies the Eddystone Lighthouse off the coast of Cornwall, England. A circular base of cut stone about 10 feet high is ringed by a guardrail, and about forty feet of concrete shaft rises above it to a glass and bronze dome enclosing a beacon, topped with an ornamental weathervane. Its purpose is primarily decorative. The nomination values it as the only lighthouse in landlocked western Ohio and as an impressive structure on a lake once the largest man-made lake in the country. The lake had earlier served as a reservoir for the Miami-Erie Canal, and the lighthouse came after that era. The builder is unknown. The nominated area is under an acre, bounded by water on three sides.","period_of_significance":"1900- (specific date 1923)","architect_builder":"Unknown","architectural_style":null,"criteria":[],"status_note":"Listed as private property, marked as unaltered and on its original site, with its present use given as decorative.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:53:12.98117-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_OH/82003614.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/82003614/b92c7f707d-800.webp","url_1600":"https://nationalhistoricalregister.com/media/82003614/b92c7f707d-1600.webp","licence":"Public domain","author":"Nyttend","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Grand_Lake_St._Marys_Lighthouse.jpg\" rel=\"noopener\">Nyttend</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Grand_Lake_St._Marys_Lighthouse.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71990275","wikipedia":"https://en.wikipedia.org/wiki/Grand_Lake_St._Marys_Lighthouse","wikidata":"https://www.wikidata.org/wiki/Q5594736"},"indexable":true,"url":"https://nationalhistoricalregister.com/ohio/mercer-county/grand-lake-st-marys-lighthouse-82003614/"}