{"nrhp_refnum":"77001138","name":"Logan Furnace Mansion","other_names":[],"category":"building","location":{"address":"3 mi. S of Bellefonte on PA 144, Benner Township","address_restricted":false,"city":"Bellefonte","county":"Centre County","state":"PA","lat":40.87733331900006,"lon":-77.76388101499998,"geom_source":"nps_gis"},"listed_date":"1977-04-11","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"A two-section stone house, with a 1798-1800 kitchen wing and a larger main section added circa 1818, located at the former Logan Furnace site near Bellefonte, Centre County, Pennsylvania. It was built for John Dunlop, an early ironmaster.","why_significant":"The house is significant for its association with the Logan Furnace ironworks, a major local iron producer that operated until 1842. The nomination describes it as the remaining evidence of a once-thriving early Centre County industry. The surviving stone building also reflects the early domestic architecture of the Dunlop and Valentine ironmaster households.","narrative":"Built of coursed stone, the Logan Furnace Mansion near Bellefonte is an L-shaped house with a two-story kitchen wing and a larger main section. John Dunlop built the kitchen wing in 1798-1800 as the first home of his household, and the main section was added around 1818 by the Valentine and Thomas families, who had taken over the Dunlop ironworks. The house is a surviving link to Logan Furnace, which began operating in 1798 and became one of the principal iron producers in Centre County before it closed in 1842. Its main entrance has a semicircular lunette, a wooden keystone and fan tracery in the window above. Fireplaces have been removed and most windows replaced, though original sash sizes and the central stairway remain. Porches were added later in the nineteenth century. The house is now the principal remaining evidence of the furnace and of the early iron industry in the valley.","period_of_significance":"1798-1842","architect_builder":"John Dunlop (built house)","architectural_style":null,"criteria":[],"status_note":"Interior fireplaces have been removed and windows largely replaced; the property is covered with tin roofing.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:28.702435-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/77001138.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/77001138/e9155a36d3-800.webp","url_1600":"https://nationalhistoricalregister.com/media/77001138/e9155a36d3-1600.webp","licence":"Public domain","author":"Pubdog","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Logan_Furnace_Mansion_Dec_12.jpg\" rel=\"noopener\">Pubdog</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Logan_Furnace_Mansion_Dec_12.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71994624","wikipedia":"https://en.wikipedia.org/wiki/Logan_Furnace_Mansion","wikidata":"https://www.wikidata.org/wiki/Q15242618"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/centre-county/logan-furnace-mansion-77001138/"}