{"nrhp_refnum":"79003188","name":"Snyder Covered Bridge No. 17","other_names":[],"category":"structure","location":{"address":"SR 361","address_restricted":false,"city":"Slabtown","county":"Columbia County","state":"PA","lat":40.90134051800004,"lon":-76.39441486699997,"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":"Snyder Covered Bridge No. 17 is a covered bridge in Slabtown, Columbia County, Pennsylvania, measuring 60.2 feet long with a roadway width of 14.75 feet and clearance of 11 feet. It is of the Queen Post truss design.","why_significant":"The nomination argues the bridge is significant for its engineering as a Queen Post covered bridge, a design used in Columbia County for longer spans. It also relates to transportation, since bridges were needed to link towns with farming and milling activities during the county's growth. The document notes that covered bridges have not been built in Columbia County in the last half century, making the county's designs unique.","narrative":"Snyder Covered Bridge No. 17 crosses a stream at Slabtown in Columbia County, Pennsylvania, and is built in the Queen Post truss design. It measures 60.2 feet long, has a roadway width of 14.75 feet, and offers 11 feet of clearance. Its roof is corrugated galvanized steel laid over wooden ribs that cross the rafters, and its floor is of horizontal boards with one wide runway on top. Oak, pine or hemlock was generally the lumber used for bridges of this type. The bridge is significant for its engineering. Queen Post trusses were used in Columbia County for longer spans, and the county's covered bridges are regarded as unique in design because none have been built there in the last half century. It also reflects transportation history, since bridges such as this connected towns with the farms and saw and grist mills that drove local business during the county's growth. The southwestern portal was destroyed by an oversized vehicle, and the abutments have been fully rebuilt in concrete.","period_of_significance":null,"architect_builder":null,"architectural_style":"Queen Post truss","criteria":[],"status_note":"The southwestern portal was destroyed by an oversized vehicle, and the abutments have been completely repaired with concrete.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:33.306698-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/79003188.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/79003188/631b2a9d9c-800.webp","url_1600":"https://nationalhistoricalregister.com/media/79003188/631b2a9d9c-1600.webp","licence":"CC BY-SA 3.0","author":"Ruhrfisch","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Snyder_Covered_Bridge_6.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:Snyder_Covered_Bridge_6.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71992840","wikipedia":"https://en.wikipedia.org/wiki/Snyder_Covered_Bridge_No._17","wikidata":"https://www.wikidata.org/wiki/Q7548891"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/columbia-county/snyder-covered-bridge-no-17-79003188/"}