{"nrhp_refnum":"12001096","name":"Irwinton Historic District","other_names":[],"category":"building","location":{"address":"9717 & 9685 Anderson Rd. (Montgomery Township)","address_restricted":false,"city":"Upton","county":"Franklin County","state":"PA","lat":39.79258559850004,"lon":-77.84885110065278,"geom_source":"nps_gis"},"listed_date":"2012-12-26","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture","Industry","Agriculture","Exploration/Settlement"],"significance_levels":["local"],"summary":{"what_it_is":"Irwinton Historic District is a collection of mill, farmstead and barn buildings along the West Branch of the Conococheague Creek in Montgomery Township, Franklin County, Pennsylvania, southeast of Mercersburg. Its core includes the ca. 1778 Irwinton stone house and the 1856 flour mill built on the site of an earlier mill.","why_significant":"The nomination argues the district is significant under Criterion A for its role in settlement, growth and prosperity in the Cumberland Valley as a milling hamlet and seat of the Irwin family, and under Criterion C as an outstanding example of vernacular early Georgian architecture with unusual interior woodwork. It also notes that few complete milling complexes remain intact in the region, and that the mill is a relatively rare survivor.","narrative":"Irwinton is a milling hamlet on the West Branch of the Conococheague Creek in Montgomery Township, Franklin County, Pennsylvania. Archibald Irwin established a flour and sawmill there by 1766, and the settlement grew into a center of industry that supplied provisions during the American Revolution. The district includes the Irwinton stone house, dating from about 1778, which has a four-bay south front, unusually large windows for an early house in the county, and interior woodwork in the Georgian manner. The 1856 frame mill, built by John William Henkell on the foundations of the earlier mill, still operates and is described as a rare survivor among regional mills. Members of the Irwin family also held notable positions. Jane Irwin Harrison and Jane Irwin Findlay served as White House hostesses during William Henry Harrison's brief term, and Elizabeth Irwin Harrison was the mother of Benjamin Harrison. The district also includes barns, dwellings, outbuildings and a mill dam on the creek.","period_of_significance":"ca. 1778-ca. 1915","architect_builder":null,"architectural_style":"COLONIAL/Georgian; MID-19TH CENTURY/Greek Revival (as listed in materials and architectural classification)","criteria":["A","C"],"status_note":"The still-operational mill is described as operating; the Anderson family ownership is noted as continuing in the nomination.","vacant_flag":false,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:10:27.346882-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/12001096.pdf"},"photo":null,"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71996599","wikipedia":"https://en.wikipedia.org/wiki/Irwinton_Historic_District","wikidata":"https://www.wikidata.org/wiki/Q137691239"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/franklin-county/irwinton-historic-district-12001096/"}