{"nrhp_refnum":"88000872","name":"Hammer Creek Bridge","other_names":[],"category":"structure","location":{"address":"LR 36011 over Hammer Creek","address_restricted":false,"city":"Brunnerville","county":"Lancaster County","state":"PA","lat":40.19676250300006,"lon":-76.27884614499999,"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 concrete arch highway bridge carrying a road over Hammer Creek in Brunnerville, Lancaster County, Pennsylvania. Its main span is 72 feet, and it was built in 1908.","why_significant":"The nomination describes it as a representative example of an early twentieth century concrete bridge. Its continuous solid parapet wall, embellished with simple incised lines, is presented as typical of Pennsylvania's early concrete highway bridges. Among the nominated bridges it is described as a particularly well preserved example of an early type of concrete bridge in the state.","narrative":"Hammer Creek Bridge is a single-span concrete arch carrying vehicular traffic over Hammer Creek near Brunnerville in Warwick and Elizabeth Townships, Lancaster County, Pennsylvania. Built in 1908, its main arch spans 72 feet and is capped by a continuous solid parapet wall decorated with simple incised lines. The bridge was constructed by Ferro Concrete Co. of Harrisburg, and its plaque records the date of construction and the county commissioners of the period. Its concrete voussoirs are incised with radiating lines, and the spandrels are solid. The bridge is significant for its engineering as an early twentieth century concrete highway bridge typical of Pennsylvania practice of the time. It is regarded as a particularly well preserved example of an early type of concrete bridge in the state. Its nomination sets out the structure as largely original, with some deterioration visible in the upstream parapet and exposed reinforcing steel.","period_of_significance":"1908","architect_builder":"Ferro Construction Co. (builder/contractor)","architectural_style":null,"criteria":[],"status_note":"Document notes upstream parapet wall leaning, rebars exposed in voussoirs, and plate on downstream spandrels; integrity marked unaltered.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:37.022043-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/88000872.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/88000872/1d0250fd8f-800.webp","url_1600":"https://nationalhistoricalregister.com/media/88000872/1d0250fd8f-1600.webp","licence":"CC BY-SA 4.0","author":"Jerrye &amp; Roy Klotz, MD","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:HAMMER_CREEK_BRIDGE,_LANCASTER_COUNTY.jpg\" rel=\"noopener\">Jerrye &amp;amp; Roy Klotz, MD</a>, <a href=\"https://creativecommons.org/licenses/by-sa/4.0\" rel=\"license noopener\">CC BY-SA 4.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:HAMMER_CREEK_BRIDGE,_LANCASTER_COUNTY.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71993203","wikipedia":"https://en.wikipedia.org/wiki/Brunnerville_Road_Bridge_over_Hammer_Creek","wikidata":"https://www.wikidata.org/wiki/Q4979096"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/lancaster-county/hammer-creek-bridge-88000872/"}