{"nrhp_refnum":"90000406","name":"Colerain Forges Mansion","other_names":[],"category":"building","location":{"address":"PA 45, 0.75 mi. S of Franklinville","address_restricted":false,"city":"Franklinville","county":"Huntingdon County","state":"PA","lat":40.639051066000036,"lon":-78.09976489799999,"geom_source":"nps_gis"},"listed_date":"1990-03-20","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Industry","Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"A Federal style ironmaster's mansion in Franklinville, Huntingdon County, Pennsylvania, set in a grove of old trees beside Spruce Creek and Route 45. It was built in sections from the late eighteenth century into the mid to late nineteenth century and is painted white throughout.","why_significant":"The nomination argues the house is the only surviving resource of the Colerain Forges ironworks, which stood across the road, and that it is a relatively unaltered ironmaster's mansion tied to a major iron enterprise. It is also presented as a fine example of mid nineteenth century Federal architecture in the county. The forge's size and the residence's scale are cited as evidence of the wealth the iron business generated.","narrative":"A Federal style mansion near Franklinville in Huntingdon County, built in four main sections between the late 1700s and the 1860s-1870s, with a stone mid-section that is the oldest part. Its symmetrical south front has five bays, sidelights at both entrances, and a round-columned porch across the facade. The house served as the residence of the ironmasters of Colerain Forge, which was established along Spruce Creek in the 1810s and later consolidated under the name Colerain Forges. David Stewart, the long-time manager, lived here from about 1830 until his death in 1869. Production records from 1828 to 1860 show total output of 29,661 tons of blooms, with census values exceeding $60,000 in a single year. The house is regarded as the only surviving structure of the forge operation and as a largely unaltered example of ironmaster housing. Its stone outbuilding, dating before 1874, also remains.","period_of_significance":"1810-1874","architect_builder":null,"architectural_style":"Federal","criteria":["A","C"],"status_note":"Heirs of Stewart still owned and occupied the residence after 1874; the forges closed that year and no visible remains of the forge operation survive.","vacant_flag":false,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:36.083737-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/90000406.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/90000406/5323fb5ffd-800.webp","url_1600":"https://nationalhistoricalregister.com/media/90000406/5323fb5ffd-1600.webp","licence":"CC0","author":"Smallbones","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Colerain_Forges_Mansion_3.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:Colerain_Forges_Mansion_3.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71993057","wikipedia":"https://en.wikipedia.org/wiki/Colerain_Forges_Mansion","wikidata":"https://www.wikidata.org/wiki/Q5144599"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/huntingdon-county/colerain-forges-mansion-90000406/"}