{"nrhp_refnum":"80003594","name":"Adairs Covered Bridge","other_names":["Cisna Mill Covered Bridge"],"category":"structure","location":{"address":"E of Andersonburg on LR 50009, Southwest Madison Township","address_restricted":false,"city":"Kistler","county":"Perry County","state":"PA","lat":40.34148169300005,"lon":-77.42378776199996,"geom_source":"nps_gis"},"listed_date":"1980-08-25","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Transportation"],"significance_levels":["state"],"summary":{"what_it_is":"A covered bridge over Shermans Creek in Perry County, Pennsylvania, also known as Adairs (Cisna Mill) Covered Bridge. It is a Burr truss bridge about 150 feet long, originally built in 1864 and rebuilt in 1919.","why_significant":"The form identifies the bridge as one of the covered bridges of Adams, Cumberland and Perry Counties, a group nominated under a multiple property cover sheet. The text provided is largely a cover sheet with limited narrative on significance.","narrative":"Adairs Covered Bridge is a Burr truss covered bridge that crosses Shermans Creek in Kistler, Perry County, Pennsylvania. The structure was originally built in 1864 and rebuilt in 1919, and its span measures about 150 feet. Its oak planking is laid crosswise, and it is reinforced with five steel I-beams and three piers, two of steel and one of concrete. The bridge has a clear width of 14 feet 3 inches and a clearance of 11 feet 4 inches, with a posted load limit of 15 tons. It was listed as one of the covered bridges of Adams, Cumberland and Perry Counties, a group of surviving timber bridges in south central Pennsylvania. The bridge is noted for its surviving nineteenth-century truss form and the early rebuilding that preserved it as a working crossing. The available text is brief and partly garbled, so details of its engineering history are limited.","period_of_significance":null,"architect_builder":null,"architectural_style":"Burr truss","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 17:11:32.818135-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/80003594.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/80003594/55c882518e-800.webp","url_1600":"https://nationalhistoricalregister.com/media/80003594/55c882518e-1600.webp","licence":"Public domain","author":"Smallbones","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Adairs_Bridge_Perry_Co.JPG\" rel=\"noopener\">Smallbones</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Adairs_Bridge_Perry_Co.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71993446","wikipedia":"https://en.wikipedia.org/wiki/Adairs_Covered_Bridge","wikidata":"https://www.wikidata.org/wiki/Q4678479"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/perry-county/adairs-covered-bridge-80003594/"}