{"nrhp_refnum":"08000784","name":"Keefe-Mumbower Mill","other_names":["Evans-Mumbower Mill"],"category":"building","location":{"address":"NE. corner of Swedesford and Township Line Rds. jct.","address_restricted":false,"city":"North Wales","county":"Montgomery County","state":"PA","lat":40.18765125900006,"lon":-75.27873048999999,"geom_source":"nps_gis"},"listed_date":"2008-08-13","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture","Industry"],"significance_levels":["local"],"summary":{"what_it_is":"A three-and-a-half-story fieldstone and stucco grist mill in Upper Gwynedd Township, Montgomery County, Pennsylvania, built into a bank on a 1.2-acre parcel beside Swedesford Road and Wissahickon Creek. A wood-frame reproduction addition was built on the west end in 2001.","why_significant":"The nomination argues the mill is significant in Industry for its place in the county's milling trade and its use of Oliver Evans equipment such as elevators, grain cleaners and hoppers. It is also significant in Architecture as an intact example of vernacular regional mill design in the Wissahickon Valley, with much of its interior milling equipment retained. It is described as one of few mills in the area that has never been converted to another use.","narrative":"Built in 1835 by John and Eliza Keefe on the Wissahickon Creek in what is now Upper Gwynedd Township, this three-and-a-half-story fieldstone and stucco grist mill is set into a bank so its basement is exposed on three sides. Its date stone reads \"J & E Keefe 1835.\" The mill follows the design of an Oliver Evans mill and keeps much of its original machinery, including a hurst frame, three elevators, a cob crusher and a slack belt hoist. It was used only for milling until 1930, which is why its interior has remained largely intact. The site had earlier mill buildings dating to 1713 and 1780. Henry Mumbower bought the mill in 1856, and his family ran it until 1930. Its survival as an unaltered regional mill, with equipment that can be demonstrated, is the basis for its importance to local industrial and architectural history.","period_of_significance":"1835-1930","architect_builder":"Keefe, John","architectural_style":"No Style","criteria":["A","C"],"status_note":"Closed as a mill in 1930, vacant and decaying until donated in 1984 and restored since; owned by the Wissahickon Valley Watershed Association and being reactivated for public education.","vacant_flag":false,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:10:27.5991-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/08000784.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/08000784/738b1ec199-800.webp","url_1600":"https://nationalhistoricalregister.com/media/08000784/738b1ec199-1600.webp","licence":"CC BY-SA 3.0","author":"Shuvaev","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Keefe-Mumbower_Mill_01.JPG\" rel=\"noopener\">Shuvaev</a>, <a href=\"https://creativecommons.org/licenses/by-sa/3.0\" rel=\"license noopener\">CC BY-SA 3.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Keefe-Mumbower_Mill_01.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71998446","wikipedia":"https://en.wikipedia.org/wiki/Keefe-Mumbower_Mill","wikidata":"https://www.wikidata.org/wiki/Q6382693"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/montgomery-county/keefe-mumbower-mill-08000784/"}