{"nrhp_refnum":"79002173","name":"Stover Mill","other_names":[],"category":"building","location":{"address":"PA 32","address_restricted":false,"city":"Erwinna","county":"Bucks County","state":"PA","lat":40.496715806000054,"lon":-75.06805986499995,"geom_source":"nps_gis"},"listed_date":"1979-10-18","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Industry","Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"Stover Mill is a 3½-story grist mill on the west bank of the Delaware River at Erwinna, Bucks County, Pennsylvania, on River Road. It was built in 1832 by Henry S. Stover and his family.","why_significant":"The nomination argues the mill is a well-preserved example of a typical 19th-century water-powered grist mill, with much of its original milling equipment intact. It was one of the first mills in the area converted to turbine power, and it is linked to the locally prominent Stover milling family. It also housed an early dynamo that supplied electricity to the Erwinna area.","narrative":"Built in 1832 on the west bank of the Delaware River at Erwinna, this rectangular grist mill is constructed of native stone in its lower two stories and brick above, with stucco covering the upper walls. Set into the river bank with its basement at river level, it was built by Henry S. Stover, who bought the riverside land in 1830, and it operated for a century under the Stover family until John J. Stover closed it in 1932. Much of the original equipment survives, including millstones, shafts, grain chutes and flour sifters, and the water turbines remain in place. The mill was one of the first in the area converted to turbine power. Stover also installed a dynamo here to supply electricity and telephone service to Erwinna, and that equipment is still displayed on the second floor. A frame sawmill added in 1836 was destroyed in the flood of 1936, leaving only faint traces. The mill is valued as a representative example of eastern Pennsylvania's water-powered grist mills and for its milling machinery and early electrical connection.","period_of_significance":"1800-1899","architect_builder":"Henry Stover & Family","architectural_style":null,"criteria":[],"status_note":"Closed as a mill in 1932; a frame sawmill attached to the south wall was destroyed in the 1936 flood; the dynamo is on view on the second floor.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:29.744476-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/79002173.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/79002173/4099d41d4f-800.webp","url_1600":"https://nationalhistoricalregister.com/media/79002173/4099d41d4f-1600.webp","licence":"CC BY-SA 3.0","author":"PattiParker","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Stover_Mill,_Erwinna_2a.jpg\" rel=\"noopener\">PattiParker</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:Stover_Mill,_Erwinna_2a.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71995551","wikipedia":"https://en.wikipedia.org/wiki/Stover_Mill","wikidata":"https://www.wikidata.org/wiki/Q7620646"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/bucks-county/stover-mill-79002173/"}