{"nrhp_refnum":"88000879","name":"County Bridge No. 148","other_names":[],"category":"structure","location":{"address":"PA 926 over Chester County","address_restricted":false,"city":"Westtown","county":"Chester County","state":"PA","lat":39.931698503000064,"lon":-75.55121802399998,"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 masonry arch highway bridge carrying Street Road (TR 926) over a branch of Chester Creek, located in Westtown and Thornbury Townships, Chester County, Pennsylvania. It was completed in 1911.","why_significant":"The nomination describes the bridge as a typical small-span twentieth-century stone arch bridge built in the style of Pennsylvania's nineteenth-century highway bridges, and states that it is notable for its high-quality design and integrity. Its engineering interest lies in its camelback configuration, with coursed, roughly square stone and dark parapet coping that accentuates the shape. The listing area of significance is engineering.","narrative":"Single-span stone arch bridge carrying Street Road over a branch of Chester Creek in Westtown and Thornbury townships, Chester County, Pennsylvania. Completed in 1911 by the local contractors P.J. McCormick & Sons, who set a bridge plaque into the inner parapet. The structure has a 36-foot main span within a total length of 150 feet and a width of about 25 feet. Its coursed, roughly square stone is laid in a camelback configuration, with dark stone used for the parapet coping stones that emphasize the profile. The bridge is regarded as a typical small-span bridge of its period, built in the manner of nineteenth-century Pennsylvania highway bridges. Its significance rests on its engineering: the design quality and the preservation of its original character. It carries vehicular traffic today, as it did originally. The bridge is one of a group of Commonwealth-owned highway bridges included in a multiple resource nomination.","period_of_significance":"1911","architect_builder":"P.J. McCormick & Sons (builder/contractor)","architectural_style":"Camelback stone arch bridge","criteria":[],"status_note":"Use is vehicular, both present and original.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:37.153322-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/88000879.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/88000879/cfe5716127-800.webp","url_1600":"https://nationalhistoricalregister.com/media/88000879/cfe5716127-1600.webp","licence":"Public domain","author":"User:Smallbones at English Wikipedia.","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:1911_Bridge_number_148.jpg\" rel=\"noopener\">User:Smallbones at English Wikipedia.</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:1911_Bridge_number_148.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71992676","wikipedia":"https://en.wikipedia.org/wiki/County_Bridge_No._148","wikidata":"https://www.wikidata.org/wiki/Q5177630"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/chester-county/county-bridge-no-148-88000879/"}