{"nrhp_refnum":"88000860","name":"Swamp Creek Road Bridge","other_names":[],"category":"structure","location":{"address":"Swamp Creek Rd. over Unami Creek","address_restricted":false,"city":"Sumneytown","county":"Montgomery County","state":"PA","lat":40.334232443000076,"lon":-75.44944528299999,"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 multiple-span stone highway arch bridge carrying Swamp Creek Road over Swamp Creek in the Sumneytown area of Marlboro Township, Montgomery County, Pennsylvania. It was built in 1892 by Thomas M. Adams.","why_significant":"The document describes the bridge as an example of a typical nineteenth-century multiple-span stone highway bridge, with roughly squared, semi-coursed stone construction. Its arch spans are relatively small for its construction date, but its styling is similar to earlier bridges in Montgomery County. The nomination regards its excellent integrity and stone construction as making it a fine representative of nineteenth-century multi-span stone arch bridges in the county.","narrative":"Built in 1892 by Thomas M. Adams, the Swamp Creek Road Bridge is a multiple-span stone arch bridge crossing Swamp Creek in rural Marlboro Township, Montgomery County, Pennsylvania, near the village of Sumneytown. It is 125 feet long and 25 feet wide, and its three arch spans are built of semi-coursed, roughly squared stone. The arches measure about 25 feet, which is small for a bridge of its date. The bridge is regarded as a typical example of nineteenth-century multiple-span stone highway construction. Its styling resembles earlier bridges built in Montgomery County, and its integrity is rated as excellent. Its significance is tied to engineering, and it is listed for its value as a representative example of the county's nineteenth-century multi-span stone arch bridges. A plaque on the bridge records the date of construction.","period_of_significance":"1892","architect_builder":"Thomas M. Adams (builder/contractor)","architectural_style":null,"criteria":[],"status_note":null,"vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:36.05623-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/88000860.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/88000860/676792762e-800.webp","url_1600":"https://nationalhistoricalregister.com/media/88000860/676792762e-1600.webp","licence":"CC0","author":"Smallbones","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Swamp_Creek_Bridge_Montco_PA.jpg\" rel=\"noopener\">Smallbones</a>, <a href=\"http://creativecommons.org/publicdomain/zero/1.0/deed.en\" rel=\"license noopener\">CC0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Swamp_Creek_Bridge_Montco_PA.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71993394","wikipedia":"https://en.wikipedia.org/wiki/Swamp_Creek_Road_Bridge","wikidata":"https://www.wikidata.org/wiki/Q7653324"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/montgomery-county/swamp-creek-road-bridge-88000860/"}