{"nrhp_refnum":"79002242","name":"Harmon's Covered Bridge","other_names":[],"category":"structure","location":{"address":"NE of Willet","address_restricted":false,"city":"Willet","county":"Indiana County","state":"PA","lat":40.71354280200006,"lon":-79.08118988499996,"geom_source":"nps_gis"},"listed_date":"1979-08-03","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Engineering","Transportation"],"significance_levels":["local"],"summary":{"what_it_is":"Harmon's Covered Bridge is a wooden covered bridge over Plum Creek in Washington Township, Indiana County, Pennsylvania, carrying road T488. It was built in 1910 and has a 41-foot end-post length with a Town truss system.","why_significant":"The nomination argues the bridge is significant as one of the four surviving covered bridges in Indiana County, which once had six. It is presented as an intact and important example of 19th-century wood bridge technology and transportation structures, as part of a thematic group of covered bridges.","narrative":"Harmon's Covered Bridge is a wooden Town truss bridge carrying road T488 across Plum Creek in Washington Township, Indiana County, Pennsylvania. Built in 1910, it has an end-post length of 41 feet and sits within the Ohio River watershed, where Plum Creek feeds into the larger drainage. Its design shares the common features of the county's covered bridges: vertical siding, a gable roof, and an open window area at the roofline. The floor is laid with boards running across the span. The bridge is one of four covered bridges still standing in Indiana County, where six were once in place. It is significant as an intact example of 19th-century wood bridge construction and transportation engineering. The county owns the bridge and maintains it well. Its recorded weight limit is three tons. It was listed as part of a thematic group of the county's surviving covered bridges.","period_of_significance":null,"architect_builder":null,"architectural_style":null,"criteria":[],"status_note":"Owned by the County and well maintained, per the description; posted weight limit of 3 tons appears on the bridge plate.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:30.492772-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/79002242.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/79002242/27ea88dc89-800.webp","url_1600":"https://nationalhistoricalregister.com/media/79002242/27ea88dc89-1600.webp","licence":"CC BY-SA 3.0","author":"JERRYE &amp; ROY KLOTZ MD","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:HARMON%27S_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:HARMON%27S_COVERED_BRIDGE.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71993087","wikipedia":"https://en.wikipedia.org/wiki/Harmon%27s_Covered_Bridge","wikidata":"https://www.wikidata.org/wiki/Q5659133"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/indiana-county/harmons-covered-bridge-79002242/"}