{"nrhp_refnum":"78001853","name":"Boldt, George C., Yacht House","other_names":[],"category":"building","location":{"address":"NW of Alexandria Bay on Wellesley Island","address_restricted":false,"city":"Alexandria Bay","county":"Jefferson County","state":"NY","lat":44.34645754600007,"lon":-75.92667833399997,"geom_source":"nps_gis"},"listed_date":"1978-04-26","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Entertainment/Recreation","Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"A large shingled yacht house on the northeast shore of Wellesley Island in the Thousand Islands of the St. Lawrence River, near Alexandria Bay, New York. It was built in 1903 as a principal dependency of the George C. Boldt Estate.","why_significant":"It is presented as an important and monumental example of Shingle Style resort architecture, with an unusually eclectic range of forms, motifs and materials. It was designed by the Philadelphia firm Hewitt and Hewitt for hotel magnate George C. Boldt. It has been in continuous use as a marine service facility and clubhouse since 1903, which adds to its value as a reminder of the American 'Age of Opulence'.","narrative":"Rising on the northeast shore of Wellesley Island in the Thousand Islands, this sprawling 1903 yacht house combines five linked parts: a circular tower with reception rooms, three central yacht bays, a large east service bay, an office and storage wing with a crenelated tower, and a caretaker's residence. The central bay measures 160 feet long. The towers and service wings are wood frame, while the bays use prefabricated steel trusses, all sheathed in weathered shingles. Inside, the tower has oak ceilings, carved stair balusters and stone fireplaces, and the main bay has an overhead crane and screw jacks for lifting vessels. Hotel magnate George C. Boldt commissioned the Philadelphia firm Hewitt and Hewitt to design it, echoing the towers and gables of his unfinished mansion on Heart Island. It is valued as a monumental example of Shingle Style resort architecture and has served yachting uses, later under the Thousand Islands Club, ever since.","period_of_significance":"1900-","architect_builder":"Hewitt and Hewitt","architectural_style":"Shingle Style","criteria":[],"status_note":"Occupied and still used as a marine service facility and clubhouse; the form describes it as unaltered and on its original site, though the original wood roof shingles were replaced with asphalt.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:39.699622-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/78001853.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/78001853/5834b34d15-800.webp","url_1600":"https://nationalhistoricalregister.com/media/78001853/5834b34d15-1600.webp","licence":"CC BY-SA 3.0","author":null,"credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Boldt_yacht_house_2.jpg\" rel=\"noopener\">Unknown author</a>, <a href=\"https://creativecommons.org/licenses/by-sa/3.0\" rel=\"license noopener\">CC BY-SA 3.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Boldt_yacht_house_2.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75318214","wikipedia":"https://en.wikipedia.org/wiki/George_C._Boldt_Yacht_House","wikidata":"https://www.wikidata.org/wiki/Q5537538"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/jefferson-county/boldt-george-c-yacht-house-78001853/"}