{"nrhp_refnum":"79003189","name":"Parr's Mill Covered Bridge No. 10","other_names":[],"category":"structure","location":{"address":"SR 371","address_restricted":false,"city":"Parr's Mill","county":"Columbia County","state":"PA","lat":40.90640305000005,"lon":-76.47264748299995,"geom_source":"nps_gis"},"listed_date":"1979-11-29","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Engineering","Transportation"],"significance_levels":["local"],"summary":{"what_it_is":"Parr's Mill Covered Bridge No. 10 is a covered timber bridge at Parr's Mill in Columbia County, Pennsylvania, 84.25 feet long with a 12.2-foot roadway. It is a Burr truss arch bridge.","why_significant":"The nomination argues the bridge is significant for its engineering as a Burr truss arch covered bridge, with a rare German siding covering. It also relates to the county's transportation history, when bridges were needed to link towns with farming and saw and grist mills. The document describes the county's covered bridge designs as unique because none have been built there in the last half century.","narrative":"Parr's Mill Covered Bridge No. 10 is a timber covered bridge in Parr's Mill, Columbia County, Pennsylvania. It measures 84.25 feet long, with a roadway 12.2 feet wide and a clearance of 11 feet. It is built as a Burr truss arch, with four diagonal braces on each side of the central king post and an arch on each side of each truss system. The bridge is notable for its covering of German siding, which the document describes as one of the few bridges so finished. The roof is tarred metal panels over wooden ribbing and rafters, and the floor is laid in diagonal boards with two runways. No steel reinforcement was added to the deck or undergirding. Much of the original stone and mortar abutments remain. The bridge is significant for its engineering and for its role in linking towns with the farms and mills that drove the county's economy in the nineteenth century.","period_of_significance":null,"architect_builder":"F. L. Shuman (builder)","architectural_style":"Burr Truss Arch","criteria":["C"],"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 17:11:34.288423-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/79003189.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/79003189/36389734ca-800.webp","url_1600":"https://nationalhistoricalregister.com/media/79003189/36389734ca-1600.webp","licence":"CC BY-SA 3.0","author":"Ruhrfisch","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Parr%27s_Mill_Covered_Bridge_4.JPG\" rel=\"noopener\">Ruhrfisch</a>, <a href=\"https://creativecommons.org/licenses/by-sa/3.0\" rel=\"license noopener\">CC BY-SA 3.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Parr%27s_Mill_Covered_Bridge_4.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71992816","wikipedia":"https://en.wikipedia.org/wiki/Parr%27s_Mill_Covered_Bridge_No._10","wikidata":"https://www.wikidata.org/wiki/Q7139709"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/columbia-county/parrs-mill-covered-bridge-no-10-79003189/"}