{"nrhp_refnum":"78001866","name":"Saddle Rock Grist Mill","other_names":[],"category":"building","location":{"address":"Grist Mill Lane and Little Neck Bay","address_restricted":false,"city":"North Hempstead","county":"Nassau County","state":"NY","lat":40.79772371700005,"lon":-73.75102116499994,"geom_source":"nps_gis"},"listed_date":"1978-12-27","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Industry","Engineering","Architecture"],"significance_levels":["state"],"summary":{"what_it_is":"A 2½-story, gambrel-roofed, wood-frame tidal grist mill with a shed on its south side, at Grist Mill Lane on Little Neck Bay in Saddle Rock, Town of North Hempstead, Nassau County, New York. It sits in a one-acre county park.","why_significant":"The nomination calls it the only extant operating tidal grist mill on Long Island. It is an important example of a rare technology and has survived at its original location since the eighteenth century. The form lists its themes as architecture, industry and engineering.","narrative":"Saddle Rock Grist Mill is a 2½-story, gambrel-roofed wood-frame mill on Little Neck Bay in Saddle Rock, Nassau County. A shed is attached to its south side. It stands in a one-acre county park within a suburban residential community, beside a millpond fed by a stream and supplemented by tidal water held back by a dam. A nearby sloop landing once gave the mill water access to the New York market. The mill is described as the only surviving operating tidal grist mill on Long Island, a rare technology that has remained at its original location since the eighteenth century. Its machinery includes an undershot water wheel on an oak drive shaft, wooden and iron gearing, and French burr millstones. Machinery was extensively replaced around 1850. In the 1950s the shingle sheathing, roof, first floor and substructure were replaced, and the mill dam and wheel were restored. The building now serves as a museum.","period_of_significance":null,"architect_builder":null,"architectural_style":null,"criteria":[],"status_note":"Used as a museum (original use grist mill). Condition is rated fair, with no known threats. Mill dam and undershot wheel were restored in the 1950s.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:38.704662-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/78001866.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/78001866/e8d74c72bf-800.webp","url_1600":"https://nationalhistoricalregister.com/media/78001866/e8d74c72bf-1600.webp","licence":"CC BY-SA 3.0","author":"Deirdrelmt","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Saddle_Rock_Grist_Mill.jpg\" rel=\"noopener\">Deirdrelmt</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:Saddle_Rock_Grist_Mill.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75313747","wikipedia":"https://en.wikipedia.org/wiki/Saddle_Rock_Grist_Mill","wikidata":"https://www.wikidata.org/wiki/Q7397725"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/nassau-county/saddle-rock-grist-mill-78001866/"}