{"nrhp_refnum":"88000735","name":"Black Rock Bridge","other_names":[],"category":"structure","location":{"address":"TR 113 over Schuylkill River","address_restricted":false,"city":"Mont Clare","county":"Chester County","state":"PA","lat":40.158920204000026,"lon":-75.51193700599998,"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":"Black Rock Bridge is a multiple-span open-spandrel concrete arch bridge carrying vehicular traffic across the Schuylkill River in Chester County, Pennsylvania, near Mont Clare. It was built in 1927 and has three main arches of 116 feet and two secondary arches of 103 feet, with a total length of 554 feet.","why_significant":"The nomination describes the bridge as a typical example of the multiple-span open-spandrel arch type. It is regarded as an exceptionally well preserved, unaltered example of this concrete bridge type, which was often used in southeastern Pennsylvania. It is one of fifteen open-spandrel bridges included in a multiple-resource nomination, built between 1906 and 1930.","narrative":"Black Rock Bridge is a concrete open-spandrel arch bridge crossing the Schuylkill River near Mont Clare in Chester County, Pennsylvania. Built in 1927 by G. A. and F. M. Wagman, it has three arches spanning 116 feet and two arches spanning 103 feet, for an overall length of 554 feet. Its two heavily structured arch ribs are plain in ornament, and its continuous solid concrete parapet walls are molded into a series of panels. Simple concrete light posts top each pier, and a sidewalk runs along the east side. The bridge is valued in engineering terms as a typical example of the multiple-span open-spandrel type once common in southeastern Pennsylvania. It remains unaltered, which makes it an exceptionally well preserved example of the type. It is one of fifteen open-spandrel bridges, built between 1906 and 1930, grouped together in a single nomination covering highway bridges in the Commonwealth.","period_of_significance":"1927","architect_builder":"Wagman, G. A. and F.M. (builder/contractor)","architectural_style":null,"criteria":[],"status_note":"Unaltered; original site; 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 17:11:36.076503-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/88000735.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/88000735/ecb04545da-800.webp","url_1600":"https://nationalhistoricalregister.com/media/88000735/ecb04545da-1600.webp","licence":"Public domain","author":"Smallbones","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Black_Rock_Bridge.JPG\" rel=\"noopener\">Smallbones</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Black_Rock_Bridge.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71992772","wikipedia":"https://en.wikipedia.org/wiki/Black_Rock_Bridge","wikidata":"https://www.wikidata.org/wiki/Q4921701"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/chester-county/black-rock-bridge-88000735/"}