{"nrhp_refnum":"10000515","name":"Croghan Island Mill","other_names":[],"category":"building","location":{"address":"9897 S Bridge St","address_restricted":false,"city":"Croghan","county":"Lewis County","state":"NY","lat":43.90042020300007,"lon":-75.39216965799994,"geom_source":"nps_gis"},"listed_date":"2010-07-30","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Industry","Architecture"],"significance_levels":["state"],"summary":{"what_it_is":"A water-powered sawmill and millwork complex with an associated concrete dam on Croghan Island in the Beaver River, Village of Croghan, Lewis County, New York. The main block was built about 1875 by the Rice brothers, and the dam dates to about 1906.","why_significant":"The nomination argues the mill is a rare, substantially intact example of a nineteenth-century water-powered sawmill in New York State. It keeps its exterior, setting and mechanical systems, and still operates commercially on water power. It reflects the water-powered industry that once fed many mills across the state and the lumber economy of Croghan.","narrative":"On Croghan Island in the Beaver River, a wood-clad mill complex and a concrete dam still turn out lumber products and millwork using water power. The main block, a two-and-a-half-story gabled building on a laid stone foundation, was built about 1875 by the Rice brothers. Later additions include a cold storage block, an office block and a sawdust outbuilding. A wooden water wheel set horizontally beneath the water drives a gear and master belt, which power pulleys in the basement and about a dozen late nineteenth and early twentieth century machines on the floor above. The poured concrete dam dates to about 1906 and replaced an earlier wooden crib dam. The mill was listed because it is a rare, largely intact example of a water-powered sawmill in New York, preserving its building, machinery, power source and island setting. Croghan's economy long centered on lumber and forest products, and the mill reflects that history. The period of significance runs to 1960 because the mill still operates the same way.","period_of_significance":"c. 1875-1960","architect_builder":"Unknown (main block built about 1875 by the locally prominent Rice brothers)","architectural_style":"No Style","criteria":["A","C"],"status_note":"Still operating as a commercial enterprise using a water-powered wheel; heated by an outdoor wood furnace.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:48.724745-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/10000515.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/10000515/ca971b4d0a-800.webp","url_1600":"https://nationalhistoricalregister.com/media/10000515/ca971b4d0a-1600.webp","licence":"CC BY-SA 4.0","author":"Allan Green","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Croghan_Island_Mill.jpg\" rel=\"noopener\">Allan Green</a>, <a href=\"https://creativecommons.org/licenses/by-sa/4.0\" rel=\"license noopener\">CC BY-SA 4.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Croghan_Island_Mill.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75318571","wikipedia":"https://en.wikipedia.org/wiki/Croghan_Island_Mill","wikidata":"https://www.wikidata.org/wiki/Q5187507"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/lewis-county/croghan-island-mill-10000515/"}