{"nrhp_refnum":"88000842","name":"Bridge in Porter Township","other_names":[],"category":"structure","location":{"address":"LR 41017 over Pine Creek","address_restricted":false,"city":"Jersey Shore","county":"Lycoming County","state":"PA","lat":41.18092942200008,"lon":-77.27828256999999,"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 lenticular truss bridge carrying vehicular traffic over Pine Creek in Porter Township, Lycoming County, Pennsylvania, near Jersey Shore. It was built in 1889 by the Berlin Iron Bridge Company of East Berlin, Connecticut, and measures 287.31 feet overall.","why_significant":"The nomination argues the bridge is an intact example of an unusual truss type, the lenticular truss, whose name derives from the lens-like shape of its curved upper and lower chords. It is considerably longer than the related Waterville Bridge and is similar in member configuration, with decorative portals. The area of significance is engineering.","narrative":"Built in 1889 by the Berlin Iron Bridge Company of East Berlin, Connecticut, this single-span steel bridge crosses Pine Creek in Porter Township, Lycoming County. It is a lenticular truss, a form named for the lens-like shape of its curved upper and lower chords. Measuring 287.31 feet overall, it carries vehicular traffic on an open steel deck with curb and guardrail. The superstructure is steel with pin and riveted connections, and the abutments and wings are concrete with scored joints. The bridge was altered in 1964. It is one of three lenticular trusses considered together in a multiple-resource group of Pennsylvania highway bridges. Its significance rests on engineering: it is an intact example of an uncommon truss type and is longer than the related Waterville Bridge, which was built by the same company. Its decorative portals add to its distinction.","period_of_significance":null,"architect_builder":"Berlin Iron Bridge Company, East Berlin, Conn. (builder)","architectural_style":null,"criteria":[],"status_note":"Altered in 1964 according to the integrity section; the form does not state current use beyond vehicular.","vacant_flag":false,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:37.191971-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/88000842.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/88000842/e17fc1c23d-800.webp","url_1600":"https://nationalhistoricalregister.com/media/88000842/e17fc1c23d-1600.webp","licence":"Public domain","author":"PennDOT","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Bridge_in_Porter_Township,_Lycoming_County.jpg\" rel=\"noopener\">PennDOT</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Bridge_in_Porter_Township,_Lycoming_County.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71993350","wikipedia":"https://en.wikipedia.org/wiki/Bridge_in_Porter_Township","wikidata":"https://www.wikidata.org/wiki/Q4966373"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/lycoming-county/bridge-in-porter-township-88000842/"}