{"nrhp_refnum":"89000355","name":"Gilbert Bridge","other_names":["Hall Estate Bridge"],"category":"structure","location":{"address":"Bishop Rd./Gilbert Rd. over Yellow Breeches Creek","address_restricted":false,"city":"Grantham","county":"Cumberland County","state":"PA","lat":40.153653320000046,"lon":-76.98212661699995,"geom_source":"nps_gis"},"listed_date":"1989-05-05","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Engineering","Transportation"],"significance_levels":["local"],"summary":{"what_it_is":"A single-lane, simple-span, pin-connected steel Pratt through truss bridge carrying a rural road over Yellow Breeches Creek between Cumberland and York counties, Pennsylvania, at the Gilbert Ford near Grantham. It is 102 feet long and was built in 1899 by the Wrought Iron Bridge Company of Canton, Ohio.","why_significant":"The nomination argues the bridge has been an essential local transportation link since 1899, replacing the hazards of fording the creek. It describes the pin-connected eye-bar and laced-member Pratt truss as engineering typical of moderate-span metal truss bridges of the late nineteenth and early twentieth centuries, and says it is a well-preserved local example of that type, retaining excellent historic integrity.","narrative":"Built in 1899 by the Wrought Iron Bridge Company of Canton, Ohio, the Gilbert Bridge crosses Yellow Breeches Creek between Cumberland and York counties in Pennsylvania. It is a single-lane, 102-foot simple-span Pratt through truss with pin-connected steel eye-bars and laced compression members, resting on coursed rubble limestone abutments. Before it was built, residents, farms, mills and businesses in the area had to ford the creek, which was often impassable depending on the weather. The bridge quickly became essential to the local road network and has remained in service for nearly ninety years. Its construction method, pin-connected eye-bar trusses, was common for moderate-span metal bridges of the late nineteenth and early twentieth centuries. The bridge is considered a well-preserved example of that engineering in its local area. Its steel is in relatively good condition, and the surrounding rural setting remains largely as it was when the bridge was new. The deck and stringers were replaced in 1955.","period_of_significance":"1899","architect_builder":"Wrought Iron Bridge Company, Canton, Ohio (builder)","architectural_style":null,"criteria":["C"],"status_note":"Presently posted for a 10-ton weight limit and carrying about 65 vehicles a day; the deck and stringers were replaced in 1955.","vacant_flag":false,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:35.627274-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/89000355.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/89000355/47fcb75525-800.webp","url_1600":"https://nationalhistoricalregister.com/media/89000355/47fcb75525-1600.webp","licence":"CC BY-SA 4.0","author":"Delphinium1","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Gilbert_Bridge.jpg\" rel=\"noopener\">Delphinium1</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:Gilbert_Bridge.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71996584","wikipedia":"https://en.wikipedia.org/wiki/Gilbert_Bridge","wikidata":"https://www.wikidata.org/wiki/Q15221681"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/cumberland-county/gilbert-bridge-89000355/"}