{"nrhp_refnum":"76001627","name":"Warwick Furnace/Farms","other_names":[],"category":"district","location":{"address":"S of Knauertown off PA 23 on Warwick Furnace Rd., East Nantmeal Township","address_restricted":false,"city":"Knauertown","county":"Chester County","state":"PA","lat":40.151053578000074,"lon":-75.74077661788724,"geom_source":"nps_gis"},"listed_date":"1976-09-13","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Industry","Agriculture","Architecture"],"significance_levels":["state"],"summary":{"what_it_is":"Warwick Furnace Farms is a complex of stone farm and ironmaster buildings in Knauertown, Chester County, Pennsylvania, combining the Warwick Furnace Farm and the adjoining Warwick Farm along the South Branch of French Creek. The furnace itself survives only as ruins, while the manor house, tenant houses, springhouse, barns and outbuildings remain.","why_significant":"The nomination argues the complex is significant for its role in the early colonial iron industry, especially the Nutt, Rutter, Savage and Potts families' ironworks. It also cites the furnace's wartime munitions production, its association with Robert Grace and Benjamin Franklin's stove design, the Washington connection after Brandywine, and experiments in agricultural techniques.","narrative":"Built in the 1730s on land patented to the Nutt family, the Warwick Furnace complex in Chester County grew around an iron furnace completed in 1738 and a manor house of random fieldstone with corner quoins. Under Robert Grace the works produced Franklin stoves, and during the Revolution the furnace was designated an official arsenal, producing cannon in 1776. George Washington's army came to Warwick after the Battle of Brandywine in 1777. Through the nineteenth century the property was increasingly run as a farm, and its owners experimented with fertilizers and lime to restore soil fertility. The furnace ruins, tenant houses, springhouse, log cabin and stone barns still stand, showing how an eighteenth-century ironmaster's estate was organized. The property has stayed in one family line for about two centuries, which the nomination considers unusual and important for understanding the region's early industrial history in the French and Pickering Creek watersheds.","period_of_significance":"1738-1860","architect_builder":null,"architectural_style":"Dutch Colonial, Italienate","criteria":[],"status_note":"The furnace is in ruins while many associated buildings remain standing; the nomination notes the manor house has been extensively remodelled and restored in the twentieth century.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:28.878069-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/76001627.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/76001627/7ea1e75e32-800.webp","url_1600":"https://nationalhistoricalregister.com/media/76001627/7ea1e75e32-1600.webp","licence":"CC0","author":"Smallbones","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Warwick_Farmhouse.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:Warwick_Farmhouse.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71996040","wikipedia":"https://en.wikipedia.org/wiki/Warwick_Furnace_Farms","wikidata":"https://www.wikidata.org/wiki/Q7971137"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/chester-county/warwick-furnace-farms-76001627/"}