{"nrhp_refnum":"66000507","name":"Plattsburgh Bay","other_names":["Cumberland Bay","Battle of Lake Champlain","See Also:Fort Brown"],"category":"district","location":{"address":"Cumberland Bay, E of Plattsburgh","address_restricted":false,"city":"Plattsburgh","county":"Clinton County","state":"NY","lat":44.69083768400006,"lon":-73.41544670571372,"geom_source":"nps_gis"},"listed_date":"1966-10-15","is_nhl":true,"nhl_designated_date":"1960-12-19","areas_of_significance":["Historic - Non-Aboriginal","Military"],"significance_levels":["national"],"summary":{"what_it_is":"A historic district of about 2,270 acres covering Plattsburgh (Cumberland) Bay on Lake Champlain in Plattsburgh, Clinton County, New York, plus two separate land parcels, the Kent-Delord House and Fort Brown, tied to the 1814 battle.","why_significant":"The naval battle of Plattsburgh on September 11, 1814 destroyed the British fleet on Lake Champlain and forced a large British invading army to withdraw to Canada. It gave the Americans control of the lake and removed British hopes of gaining a foothold from which to negotiate cession of US territory. Naval historian Alfred T. Mahan called it the incident of the War of 1812 that most nearly merits the term 'decisive'.","narrative":"Plattsburgh Bay, also called Cumberland Bay, is the stretch of Lake Champlain between Cumberland Head and the mainland at Plattsburgh, New York. Its nominated area covers roughly 2,270 acres of water, along with two separate land parcels: the Kent-Delord House and Fort Brown. On September 11, 1814, Commodore Thomas Macdonough's American fleet, anchored in the confined waters of the bay, defeated a British squadron in a fight lasting about two and a half hours. With the British fleet destroyed, Governor General Prevost's army of more than 11,000 regulars withdrew to Canada. The result gave the Americans control of Lake Champlain and ended British hopes of gaining territory along the Canadian frontier. The city has grown over most of the land fighting sites, but the bay keeps its historic appearance. The Kent-Delord House, built in 1797, served as British officers' quarters, and the earthwork remains of Fort Brown mark the American defensive line. A 135-foot limestone obelisk, the Macdonough Memorial, overlooks the bay.","period_of_significance":"September 11, 1814","architect_builder":null,"architectural_style":null,"criteria":[],"status_note":"Bay condition listed as good; the bay retains its historic appearance. The Kent-Delord House is a historic house museum, and Fort Brown is an eroded earthwork, the only remaining fortification.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:39.914408-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/66000507_NHL.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/66000507/9482bbaf79-800.webp","url_1600":"https://nationalhistoricalregister.com/media/66000507/9482bbaf79-1600.webp","licence":"CC BY-SA 3.0","author":"Daniel Case","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Plattsburgh_Bay.jpg\" rel=\"noopener\">Daniel Case</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:Plattsburgh_Bay.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75315667","wikipedia":"https://en.wikipedia.org/wiki/Plattsburgh_Bay","wikidata":"https://www.wikidata.org/wiki/Q7202541"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/clinton-county/plattsburgh-bay-66000507/"}