{"nrhp_refnum":"99000093","name":"Adams Covered Bridge","other_names":["San Toy Covered Bridge"],"category":"structure","location":{"address":"San Toy Rd.","address_restricted":false,"city":"Malta","county":"Morgan County","state":"OH","lat":39.624371573000076,"lon":-82.03261803499998,"geom_source":"nps_gis"},"listed_date":"1999-02-05","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Engineering"],"significance_levels":["local"],"summary":{"what_it_is":"A single-span wooden multiple kingpost truss covered bridge over San Toy Creek in Union Township, about 10 miles west of Malta, Morgan County, Ohio. Built in 1875 (according to local residents), builder unknown; possibly built by the State of Ohio.","why_significant":"The nomination argues the bridge is significant under Criterion C for exemplifying the multiple kingpost truss, the most common wooden truss design in Ohio, later known as the Buckingham truss. It is one of five covered bridges left in Morgan County and one of only three on its original site. Its original timber trusswork remains intact despite 1994 maintenance.","narrative":"Adams Covered Bridge, also called San Toy Covered Bridge, carries County Road 16 over San Toy Creek in Union Township, roughly 10 miles west of Malta in Morgan County, Ohio. Local residents date it to 1875. The single-span wooden structure is 66 feet long including projecting portals, with a 12-foot roadway, vertical boarded siding, cut sandstone abutments and a tin roof. Its multiple kingpost truss was the most common wooden truss design in Ohio and became known as the Buckingham truss. Only about 135 of the state's timber truss bridges survive, and this is one of five covered bridges left in Morgan County and one of three still on its original site. The bridge once stood at the edge of the coal mining town of San Toy. It was closed to traffic in 1987. Maintenance in 1994 added steel supports and a new roof, but the original timber trusswork remains intact. Records do not name a builder, though the road's State designation suggests Ohio may have built it.","period_of_significance":"1875 to 1948","architect_builder":"Unknown","architectural_style":"Other: Covered Bridge (multiple kingpost truss)","criteria":["C"],"status_note":"Closed to traffic in 1987; current function listed as not in use. Maintenance in 1994 added steel supports, new roof lath and a new tin roof.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:52:07.15426-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_OH/99000093.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/99000093/78bc0e5b1b-800.webp","url_1600":"https://nationalhistoricalregister.com/media/99000093/78bc0e5b1b-1600.webp","licence":"Public domain","author":"Nyttend","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Adams_Covered_Bridge_from_north.jpg\" rel=\"noopener\">Nyttend</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Adams_Covered_Bridge_from_north.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71990627","wikipedia":"https://en.wikipedia.org/wiki/Adams_Covered_Bridge","wikidata":"https://www.wikidata.org/wiki/Q4680334"},"indexable":true,"url":"https://nationalhistoricalregister.com/ohio/morgan-county/adams-covered-bridge-99000093/"}