{"nrhp_refnum":"79003825","name":"Martin's Mill Covered Bridge","other_names":[],"category":"structure","location":{"address":"W of Marianna crossing Ten Mile Creek, West Bethlehem Township","address_restricted":false,"city":"Marianna","county":"Washington County","state":"PA","lat":40.01369358800008,"lon":-80.13142755499996,"geom_source":"nps_gis"},"listed_date":"1979-06-22","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Transportation"],"significance_levels":["state"],"summary":{"what_it_is":"A queenpost covered bridge crossing Ten Mile Creek near Marianna in Washington County, Pennsylvania, in Amwell Township. It is one of the covered bridges in the Washington and Greene Counties multiple property group.","why_significant":"The nomination presents the bridge as an important example of vernacular wood bridge technology, a once common bridge type in Pennsylvania. It notes that the bridge replaced an earlier covered bridge destroyed by flood in 1850. The bridges in these rural counties are described as illustrating the type's construction technology through simple truss types and local design features.","narrative":"Martin's Mill Covered Bridge is a wooden queenpost truss bridge spanning Ten Mile Creek in Amwell Township, Washington County, Pennsylvania. The structure measures 72 feet in length and 14 feet 3 inches in width, and it was built in 1888 or 1889 according to the form's differing entries. It replaced an earlier covered bridge that a flood destroyed in 1850. Covered bridges of this type were once common across Pennsylvania, and this example is valued as a clear illustration of vernacular wood construction. Its simple truss design and local detailing reflect the building practices of the rural counties where it stands. The bridge is one of a group of covered bridges in Washington and Greene Counties that together document this construction tradition in the region. Its relatively long span for a queenpost truss also distinguishes it among the surveyed examples.","period_of_significance":null,"architect_builder":null,"architectural_style":null,"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 17:11:30.275469-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/79003825.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/79003825/b274f9d531-800.webp","url_1600":"https://nationalhistoricalregister.com/media/79003825/b274f9d531-1600.webp","licence":"CC BY-SA 3.0","author":"JERRYE &amp; ROY KLOTZ MD","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:MARTIN%27S_MILL_COVERED_BRIDGE.jpg\" rel=\"noopener\">JERRYE &amp;amp; ROY KLOTZ MD</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:MARTIN%27S_MILL_COVERED_BRIDGE.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71994037","wikipedia":"https://en.wikipedia.org/wiki/Martin%27s_Mill_Covered_Bridge_(Marianna,_Pennsylvania)","wikidata":"https://www.wikidata.org/wiki/Q6774798"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/washington-county/martins-mill-covered-bridge-79003825/"}