{"nrhp_refnum":"88000938","name":"Bridge in Jefferson Borough","other_names":[],"category":"structure","location":{"address":"Cochran Mill Rd. over Lick Run","address_restricted":false,"city":"Cochrans Mill","county":"Allegheny County","state":"PA","lat":40.29293452300004,"lon":-79.97126534599994,"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 small stone arch bridge over Lick Run on Cochran Mill Road in Jefferson Borough, Allegheny County, Pennsylvania, with a single 30-foot span. It was built in 1901 and is a structure rather than a building.","why_significant":"The nomination describes the bridge as a well-preserved representative example of a small early twentieth-century stone arch bridge, built with rock-face ashlar, smooth voussoirs and coping stones. It is presented as an example of the continuing stone arch tradition in Pennsylvania. Its location is described as unusual, since most stone arch bridges in the related thematic group are in the southeastern and south central parts of the state, and this one is said to be one of only five in western Pennsylvania.","narrative":"A single-span stone arch bridge carries Cochran Mill Road over Lick Run in Jefferson Borough, Allegheny County. It was built in 1901 and measures about 30 feet overall, with a main arch span of 24 feet. The arch is formed of smooth cut stone, and the walls are of rock-face ashlar with smooth voussoirs and coping stones. Its designer and builder are not recorded. The bridge is regarded as a well-preserved example of a small early twentieth-century stone arch bridge. Although its modest span makes it technologically unremarkable, it shows the continuing use of stone arch construction in Pennsylvania. Its location is unusual, because most stone arch bridges in the related group are in the southeastern and south central parts of the state. Three sections of the stone parapet have fallen into the creek. The nominated area is limited to the bridge's superstructure and substructure, and the property is listed for its engineering significance.","period_of_significance":"1901","architect_builder":null,"architectural_style":"Stone arch bridge","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 17:11:35.5907-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/88000938.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/88000938/6f2e8d52ee-800.webp","url_1600":"https://nationalhistoricalregister.com/media/88000938/6f2e8d52ee-1600.webp","licence":"CC BY-SA 4.0","author":"Lee Paxton","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:BridgeinJeffersonBorough.jpg\" rel=\"noopener\">Lee Paxton</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:BridgeinJeffersonBorough.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71992220","wikipedia":"https://en.wikipedia.org/wiki/Bridge_in_Jefferson_Borough","wikidata":"https://www.wikidata.org/wiki/Q4966361"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/allegheny-county/bridge-in-jefferson-borough-88000938/"}