{"nrhp_refnum":"99001288","name":"Helfrich's Springs Grist Mill (Boundary Increase)","other_names":["Grim, Peter, House"],"category":"building","location":{"address":"506 Mickley Rd.","address_restricted":false,"city":"Whitehall Township","county":"Lehigh County","state":"PA","lat":40.62478234400004,"lon":-75.49154544899994,"geom_source":"nps_gis"},"listed_date":"1999-10-28","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Industry","Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"A two-and-a-half-story brick house in Whitehall Township, Lehigh County, Pennsylvania, across the road from the Helfrich's Springs Grist Mill, with a building sequence beginning around 1753 and additions in 1824, 1885 and about 1950. The house was the residence of the mill operators, and the nomination adds it as a boundary increase to the mill's listing.","why_significant":"The house is significant for its association with the stone grist mill, where its occupants operated the mill from 1807 to 1942. It is also argued to be a vernacular example of the Federal style in Whitehall Township, with fanlight transoms, varied brick bonds, and interior detailing cited as representative of that style.","narrative":"Across the road from the Helfrich's Springs Grist Mill in Whitehall Township stands a brick house whose oldest section dates to about 1753, with a main block built in 1824 and later additions around 1885 and 1950. The main house bears a fanlight transom inscribed with the 1824 date and the name Peter Grim Homestead. Peter Grim acquired the land and log buildings in 1802 and erected the stone grist mill in 1807 at his direction. The house served as the residence of the men who ran the mill, including Grim, the Deshler family, and the Helfrich family. Milling operations ended in 1942 when the machinery was removed. The house is regarded as a good example of the vernacular Federal style in the township, and its association with the mill is the main basis for its significance. The property covers 0.69 acres and includes a smokehouse and privy considered contributing, along with later non-contributing outbuildings.","period_of_significance":"1807-1942","architect_builder":null,"architectural_style":"Early Republic Federal","criteria":["A","C"],"status_note":"Milling operations ceased in 1942 when machinery was removed; the property was later subdivided and acquired by Whitehall Township.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:37.967343-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/99001288.pdf"},"photo":null,"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71998716","wikipedia":null,"wikidata":null},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/lehigh-county/helfrichs-springs-grist-mill-boundary-increase-99001288/"}