{"nrhp_refnum":"88000785","name":"Lilly Bridge","other_names":[],"category":"structure","location":{"address":"PA 53 over Burgoon Run","address_restricted":false,"city":"Lilly","county":"Cambria County","state":"PA","lat":40.42377132300004,"lon":-78.61737790499996,"geom_source":"nps_gis"},"listed_date":"1988-06-22","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Engineering","Transportation"],"significance_levels":["state"],"summary":{"what_it_is":"A single-span stone arch highway bridge carrying a state route over Burgoon Run at Lilly in Cambria County, Pennsylvania. It was built in 1832 as part of the Allegheny Portage Railroad.","why_significant":"The nomination argues the bridge is unusual both for its historical association with the Allegheny Portage Railroad and for its configuration. Its elliptical arch and curved wingwalls are cited as distinctive features. It outlasted the railroad and retains good integrity despite 20th-century metal guide rails and a partial concrete parapet.","narrative":"Built over Burgoon Run at Lilly in Cambria County, the Lilly Bridge is a single-span stone arch of roughly squared, coursed ashlar. It dates to 1832 and was constructed for the Allegheny Portage Railroad, a system of inclined planes that carried Pennsylvania Main Line Canal boats over the Allegheny Mountains between 1832 and 1834. The railroad linked the eastern and western divisions of the canal. Its elliptical arch and curved wingwalls set it apart from most railroad bridges, which typically had no parapet wall, and the bridge has no parapet of the original type. The bridge outlasted the railroad and today carries traffic on a state highway. Metal guide rails and a partial concrete parapet were added in the twentieth century, but the structure retains good integrity. Its importance rests on its transportation and engineering associations, including its role in the portage system and its unusual design. It is 18 feet long and 30 feet wide, and includes only the superstructure and substructure.","period_of_significance":null,"architect_builder":null,"architectural_style":null,"criteria":[],"status_note":"Carries vehicular traffic on a state highway","vacant_flag":false,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:36.397241-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/88000785.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/88000785/479eb20f55-800.webp","url_1600":"https://nationalhistoricalregister.com/media/88000785/479eb20f55-1600.webp","licence":"Public domain","author":"Joseph Elliott","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Lilly_Bridge.jpg\" rel=\"noopener\">Joseph Elliott</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Lilly_Bridge.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71992492","wikipedia":"https://en.wikipedia.org/wiki/Lilly_Bridge","wikidata":"https://www.wikidata.org/wiki/Q6548353"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/cambria-county/lilly-bridge-88000785/"}