{"nrhp_refnum":"88000772","name":"Centennial Bridge","other_names":[],"category":"structure","location":{"address":"Station Ave. over Saucon Creek","address_restricted":false,"city":"Center Valley","county":"Lehigh County","state":"PA","lat":40.52859047800007,"lon":-75.39159481899998,"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 three-span stone arch highway bridge carrying Station Avenue over Saucon Creek in Center Valley, Lehigh County, Pennsylvania, built of rubble masonry. Its overall length is 233 feet with three 23-foot arches.","why_significant":"The nomination argues the bridge is unusual for its long, high stone arches, whose slightly horseshoe-shaped profile is considered rare among the bridges in the multiple property group. It is one of three stone bridges over 200 feet long in that group and one of three in Lehigh County, all built in the last quarter of the nineteenth century. The listing is under the engineering area of significance.","narrative":"Centennial Bridge is a three-span stone arch carrying Station Avenue over Saucon Creek in Upper Saucon Township, Lehigh County, Pennsylvania. Built of rubble masonry around 1876, according to PennDOT records, it measures 233 feet overall, with three arches of 23 feet each and two piers. The bridge is regarded as unusual because of the height of its arches above the stream and their slightly horseshoe-shaped profile, which together give it a configuration seen rarely among the bridges in its group. Its length places it among only three stone bridges over 200 feet long in the group, and it is one of three stone bridges in Lehigh County from the last quarter of the nineteenth century. Its importance rests on its engineering. A counterfort wall and underpinning added in 1980 altered the structure, and it continues to carry vehicle traffic in a residential setting.","period_of_significance":"1876","architect_builder":null,"architectural_style":null,"criteria":["C"],"status_note":"Altered in 1980 with a counterfort wall and underpinning; in vehicular use.","vacant_flag":false,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:37.293895-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/88000772.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/88000772/e9512f96d4-800.webp","url_1600":"https://nationalhistoricalregister.com/media/88000772/e9512f96d4-1600.webp","licence":"Public domain","author":"Rob Tucher","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Centennial_Bridge,_Station_Avenue_spanning_Saucon_Creek,_Center_Valley_(Lehigh_County,_Pennsylvania).jpg\" rel=\"noopener\">Rob Tucher</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Centennial_Bridge,_Station_Avenue_spanning_Saucon_Creek,_Center_Valley_(Lehigh_County,_Pennsylvania).jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71993318","wikipedia":"https://en.wikipedia.org/wiki/Centennial_Bridge_(Center_Valley,_Pennsylvania)","wikidata":"https://www.wikidata.org/wiki/Q5059122"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/lehigh-county/centennial-bridge-88000772/"}