{"nrhp_refnum":"88000800","name":"Witherup Bridge","other_names":[],"category":"structure","location":{"address":"LR 60007 over Scrubgrass Creek","address_restricted":false,"city":"Kennerdell","county":"Venango County","state":"PA","lat":41.25496467600004,"lon":-79.84066429199999,"geom_source":"nps_gis"},"listed_date":"1988-06-22","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Engineering"],"significance_levels":["state"],"summary":{"what_it_is":"A single-span Pratt pony truss bridge carrying vehicular traffic over Scrubgrass Creek in rural Clinton Township, Venango County, near Kennerdell, Pennsylvania. It was built in 1906 by the Canton Bridge Company of Canton, Ohio.","why_significant":"The nomination argues the bridge is an unusual example of the Pratt pony truss type. It is described as the only example of a Pratt pony truss with vertical end posts and the only pony truss with riveted joints. It is also the only twentieth-century example among the seven Pratt pony trusses in the multiple property group. The area of significance is engineering.","narrative":"Built in 1906 by the Canton Bridge Company of Canton, Ohio, the Witherup Bridge is a single-span steel pony truss carrying vehicular traffic over Scrubgrass Creek in Clinton Township, Venango County. The span measures 86 feet overall, and the nominated property, including wing walls, is a rectangle 96 feet long and 25 feet wide. The bridge uses a Pratt truss configuration. Its distinguishing features are vertical end posts and riveted joints, which are regarded as unusual within the group of Pratt pony trusses in the state. The nomination identifies it as the only twentieth-century example among the seven Pratt pony trusses included in the Highway Bridges Owned by the Commonwealth of Pennsylvania multiple property listing. Its significance rests on engineering, as an uncommon surviving design of its type. The bridge retains its original form and is documented with a bridge plaque dating its construction.","period_of_significance":"1906","architect_builder":"Canton Bridge Company (bridge company)","architectural_style":null,"criteria":["C"],"status_note":"Unaltered, as marked on the form's integrity check; the overall condition rating is not clearly recorded in the OCR text.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:36.405312-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/88000800.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/88000800/6c03a31ba5-800.webp","url_1600":"https://nationalhistoricalregister.com/media/88000800/6c03a31ba5-1600.webp","licence":"Public domain","author":"PennDOT","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Witherup_Bridge.jpg\" rel=\"noopener\">PennDOT</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Witherup_Bridge.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71993959","wikipedia":"https://en.wikipedia.org/wiki/Witherup_Bridge","wikidata":"https://www.wikidata.org/wiki/Q8028177"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/venango-county/witherup-bridge-88000800/"}