{"nrhp_refnum":"83002224","name":"Great Valley Mill","other_names":["Old Grist Mill in the Great Valley"],"category":"building","location":{"address":"72 N. Valley Rd., Tredyffin Township","address_restricted":false,"city":"Paoli","county":"Chester County","state":"PA","lat":40.06612909100005,"lon":-75.48979106599995,"geom_source":"nps_gis"},"listed_date":"1983-09-01","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Industry","Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"A four-storied, banked, rectangular stone grist mill with stucco-covered fieldstone walls in the Great Valley area of Paoli, Chester County, Pennsylvania. It was built in 1859 by Joseph F. Jeanes on the site of an earlier mill.","why_significant":"The nomination argues the mill is an outstanding example of a mid-19th century commercial \"Merchant's Mill\" built on a design published by Oliver Evans, typical of southeastern Pennsylvania milling. Its milling machinery, including a turbine, gearing, hoppers, crane, and French buhrstone millstones, is largely intact and operable, and the mill served local and wider commercial markets in the 19th and 20th centuries.","narrative":"Built in 1859 by Joseph F. Jeanes, a local miller and farmer, this four-storied stone grist mill stands in the Great Valley area of Paoli, Chester County, Pennsylvania. Its fieldstone walks are covered with stucco, supported by heavy timbers, and capped by a shingled gable roof. The building follows a Merchant's Mill form based on a design Oliver Evans published in 1795, a type common in southeastern Pennsylvania. Its interior remains notable because much of the milling equipment is still in place, including a turbine dating to about 1900, gearing, hoppers, a crane, a screw hoist, bucket elevators, and French buhrstone millstones. The mill was used to grind commercial flour from 1913 under Richard Haughton, and in the 1940s it was leased to Pepperidge Farm and General Baking Co. as a model commercial mill. The property is significant for its architecture and for its industrial history as a working mill.","period_of_significance":"1859","architect_builder":"Joseph F. Jeanes (builder)","architectural_style":null,"criteria":["A","C"],"status_note":"The mill's machinery is described as intact and mostly operable; the present owner has been restoring the mill to make it operable again.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:34.530644-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/83002224.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/83002224/34966995df-800.webp","url_1600":"https://nationalhistoricalregister.com/media/83002224/34966995df-1600.webp","licence":"CC0","author":"Smallbones","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Great_Valley_Mill.JPG\" rel=\"noopener\">Smallbones</a>, <a href=\"http://creativecommons.org/publicdomain/zero/1.0/deed.en\" rel=\"license noopener\">CC0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Great_Valley_Mill.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71996873","wikipedia":"https://en.wikipedia.org/wiki/Great_Valley_Mill","wikidata":"https://www.wikidata.org/wiki/Q15222075"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/chester-county/great-valley-mill-83002224/"}