{"nrhp_refnum":"88000807","name":"Wissahickon Memorial Bridge","other_names":["See Also:Fairmont Park Historic District"],"category":"structure","location":{"address":"Henry Ave. over Wissahickon Dr.","address_restricted":false,"city":"Philadelphia","county":"Philadelphia","state":"PA","lat":40.02420814100003,"lon":-75.19579805299998,"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 open-spandrel concrete arch bridge carrying Vehicular traffic over Wissahickon Drive at Henry Avenue in Philadelphia, Pennsylvania. It was built in 1931.","why_significant":"The document describes it as an important and unusual open-spandrel bridge, the longest single concrete arch span in the group of bridges nominated under the Pennsylvania highway bridges multiple resource area. It is presented as a late example of an embellished concrete bridge and the only open-spandrel arch in that group faced with stone. Its significance is placed under Engineering.","narrative":"Built in 1931, the Wissahickon Memorial Bridge is a single-span concrete arch carrying vehicular traffic over Wissahickon Drive near Henry Avenue in Philadelphia. The main span measures 288 feet and rises high above the roadway, so the full arch can be seen from below. Its open-spandrel design uses a two-ribbed arch that supports smaller spandrel arches and continuous solid parapets. The arches, spandrel walls and parapet are faced with coursed fieldstone, applied in a carefully executed masonry treatment. The bridge is valued for its engineering, and it is considered a late example of an embellished concrete bridge. Among the bridges in its nominated group, it is the only open-spandrel arch faced with stone, and it is also the longest single concrete arch span in that group. The nominated property covers the bridge superstructure and substructure only, within a rectangle of about 350 by 78 feet.","period_of_significance":"1931","architect_builder":null,"architectural_style":null,"criteria":[],"status_note":null,"vacant_flag":false,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:37.152127-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/88000807.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/88000807/ff4997cb0c-800.webp","url_1600":"https://nationalhistoricalregister.com/media/88000807/ff4997cb0c-1600.webp","licence":"Public domain","author":"Joseph Elliott","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:HenryAvenueBridge.jpg\" rel=\"noopener\">Joseph Elliott</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:HenryAvenueBridge.jpg"},"district":{"nrhp_refnum":"72001151","name":"Fairmount Park","url":"https://nationalhistoricalregister.com/districts/pennsylvania/fairmount-park-72001151/"},"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71993797","wikipedia":"https://en.wikipedia.org/wiki/Wissahickon_Memorial_Bridge","wikidata":"https://www.wikidata.org/wiki/Q8027700"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/philadelphia/wissahickon-memorial-bridge-88000807/"}