{"nrhp_refnum":"79002311","name":"Brown, Gottlieb, Covered Bridge","other_names":["Sam Wagner Covered Bridge"],"category":"structure","location":{"address":"E of Potts Grove on T 594, East Chillisquauque/Liberty Townships","address_restricted":false,"city":"Potts Grove","county":"Northumberland County","state":"PA","lat":41.00188049900004,"lon":-76.77369061999997,"geom_source":"nps_gis"},"listed_date":"1979-08-08","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Transportation"],"significance_levels":["local"],"summary":{"what_it_is":"A single-span covered timber Burr truss bridge (Northumberland County bridge #70) crossing Chillisquaque Creek on T 594 east of Potts Grove, Northumberland County, Pennsylvania. It was built in 1881 by George W. Keefer near the old Gottlieb Brown Farm.","why_significant":"The form presents the bridge as one of seven surviving covered bridges in Northumberland County that illustrate 19th-century wood bridge technology. It combines a multiple kingpost truss with a double Burr arch, a combined design patented in 1817 by Theodore Burr that was very popular for many years.","narrative":"Built in 1881 by George W. Keefer over Chillisquaque Creek near the former Gottlieb Brown Farm in Northumberland County, Pennsylvania, this single-span covered timber bridge carries a local road on a multiple kingpost truss with a double Burr arch. The clear span is 74 feet 9 inches between stone masonry abutments, with a total length of 86 feet 8 inches and a roadway about 14 feet wide inside the structure. Its floor is laid with three-inch transverse planks, and the vertical clearance under the timber portal is 13 feet. The total cost was reported as $939. The Burr arch design, patented in 1817 by Theodore Burr, was widely used for many years. The bridge is one of seven covered bridges in the county that are grouped together as a thematic resource. Reviewers regarded the group as among the rare survivors of pre-1930 covered bridges in the county and as representative of 19th-century wood bridge construction and transportation networks. The bridge is also known as Sam Wagner Covered Bridge.","period_of_significance":"1881","architect_builder":"George W. Keefer (builder)","architectural_style":null,"criteria":[],"status_note":"Condition given as Overall, Fair Condition; load limit 3 tons.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:29.757336-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/79002311.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/79002311/b3319e3e26-800.webp","url_1600":"https://nationalhistoricalregister.com/media/79002311/b3319e3e26-1600.webp","licence":"CC0","author":"Smallbones","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:G_Brown_Covered_Bridge_Montour_Co.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:G_Brown_Covered_Bridge_Montour_Co.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71993424","wikipedia":"https://en.wikipedia.org/wiki/Gottlieb_Brown_Covered_Bridge","wikidata":"https://www.wikidata.org/wiki/Q5588055"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/northumberland-county/brown-gottlieb-covered-bridge-79002311/"}