{"nrhp_refnum":"72001120","name":"Chester Creek Historic District","other_names":[],"category":"district","location":{"address":"N, E, and S of Glen Mills along the W branch of Chester Creek","address_restricted":false,"city":"Thornbury","county":"Delaware County","state":"PA","lat":39.92336681300006,"lon":-75.49041366073922,"geom_source":"nps_gis"},"listed_date":"1972-03-24","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Industry","Politics/Government","Architecture"],"significance_levels":["state"],"summary":{"what_it_is":"A rural historic district in the Chester Creek Valley at Thornbury, Delaware County, Pennsylvania, centred on the village of Glen Mills and the stream's mill sites, workers' housing and farmhouses. Its earliest building dates are not firmly documented, with houses from the eighteenth and nineteenth centuries.","why_significant":"The nomination argues the district is significant for its residents' contributions to state and national government and commerce, for its architecture, and for its role in the industrial development of Pennsylvania. Its early iron forge and mills, its eighteenth- and nineteenth-century houses, and its surviving workers' cottages are cited as evidence. The district is also described as a rural area with many remaining historic sites.","narrative":"Glen Mills and the surrounding stretch of Chester Creek form a rural district in Thornbury Township, Delaware County, with houses, mills and forges dating from the eighteenth century onward. Taylor's Sarum Forge, one of the earliest iron works in the province, was operated by John Taylor, a surveyor who worked on William Penn's western lands. Persifor Frazier, his son-in-law, served as a captain in the 4th Battalion of Pennsylvania in the Revolutionary War and was captured at Brandywine, later sitting in the Pennsylvania Assembly from 1781 to 1784. The district's stone and log houses, including the Hemphill House with its Federal-style woodwork, show how buildings were altered as owners' fortunes changed. Its workers' cottages, built about 1830 to 1880 in row and duplex forms, are described as among the best surviving examples of working-class domestic architecture of their period in the region. The mills, once numerous, are largely ruined, but the sites preserve material for archaeological study of eighteenth- and nineteenth-century industry.","period_of_significance":"18th Century-19th Century","architect_builder":null,"architectural_style":null,"criteria":[],"status_note":"Many mills and forges are in ruins; Locksley Mill is noted as the exception among the mills, and the remaining historic properties are described as in fair to good condition.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:30.818884-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/72001120.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/72001120/aa58587896-800.webp","url_1600":"https://nationalhistoricalregister.com/media/72001120/aa58587896-1600.webp","licence":"Public domain","author":"User:Smallbones on English Wikipedia.","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:ThornburyTwp.JPG\" rel=\"noopener\">User:Smallbones on English Wikipedia.</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:ThornburyTwp.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71998350","wikipedia":"https://en.wikipedia.org/wiki/Chester_Creek_Historic_District","wikidata":"https://www.wikidata.org/wiki/Q5093524"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/delaware-county/chester-creek-historic-district-72001120/"}