{"nrhp_refnum":"88000767","name":"Harrison Avenue Bridge","other_names":[],"category":"structure","location":{"address":"LR 5 over LR 35009 Par--Roaring Brook and RR","address_restricted":false,"city":"Scranton","county":"Lackawanna County","state":"PA","lat":41.40003778700003,"lon":-75.65135862599999,"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 open-spandrel concrete arch bridge carrying Harrison Avenue over Roaring Brook and the Lackawanna Valley railroad tracks in Scranton, Lackawanna County, Pennsylvania. The form dates it to 1922, based on a plaque.","why_significant":"The nomination describes it as an important open-spandrel bridge whose main span of 201 feet is the longest of the typical open-spandrel arches in the nomination. Its massive arch is shown with minimal surface treatment, and symmetrically placed spandrel arches soften its appearance. It is presented as the longest-spanning nominated example of this frequently used concrete bridge type, and the significance is listed under Engineering.","narrative":"Spanning Roaring Brook and a railroad line in Scranton, this open-spandrel concrete arch bridge was completed in 1922, according to a plaque on the structure. Its three spans include a main arch of 201 feet, and the arch rises high above the brook. Designed by William Schunk and built by the Anthracite Bridge Company, the bridge has a plain concrete finish, with only its piers given visual emphasis. Symmetrically placed spandrel arches, rather than posts, lighten the otherwise stark profile. Its engineering importance rests on its length: it is the longest-spanning example among the nominated open-spandrel concrete bridges, a bridge type that was widely used. The structure has been altered over time, including a parapet extension and superstructure concrete repairs, and it continues to carry vehicle traffic today.","period_of_significance":null,"architect_builder":"William Schunk (designer/engineer); Anthracite Bridge Company (builder/contractor)","architectural_style":null,"criteria":[],"status_note":"Altered: extension of parapet and superstructure with concrete repairs; 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 17:11:35.835517-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/88000767.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/88000767/ade1d63346-800.webp","url_1600":"https://nationalhistoricalregister.com/media/88000767/ade1d63346-1600.webp","licence":"CC BY-SA 2.0","author":"Adam Moss","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Harrison_Avenue_Bridge_-_March_2015.jpg\" rel=\"noopener\">Adam Moss</a>, <a href=\"https://creativecommons.org/licenses/by-sa/2.0\" rel=\"license noopener\">CC BY-SA 2.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Harrison_Avenue_Bridge_-_March_2015.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71993117","wikipedia":"https://en.wikipedia.org/wiki/Harrison_Avenue_Bridge","wikidata":"https://www.wikidata.org/wiki/Q5665505"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/lackawanna-county/harrison-avenue-bridge-88000767/"}