{"nrhp_refnum":"75001458","name":"McColly Covered Bridge","other_names":[],"category":"structure","location":{"address":"2 mi. SE of Bloom Center","address_restricted":false,"city":"Bloom Center","county":"Logan County","state":"OH","lat":40.40103628500003,"lon":-83.92417772599998,"geom_source":"nps_gis"},"listed_date":"1975-05-28","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Engineering"],"significance_levels":["state"],"summary":{"what_it_is":"A single-span wooden Howe truss covered bridge carrying county road 130 over the Great Miami River about 2 miles southeast of Bloom Center in Logan County, Ohio. It was built in 1876.","why_significant":"The bridge is presented as an attractive, well-maintained example of the Howe truss, a design patented in 1840 that replaced wooden verticals with adjustable iron rods. Only 18 Howe truss covered bridges were said to remain in Ohio, and this is one of the better examples. It is also tied to its builders and to local settler Nicholas McColly.","narrative":"This single-span covered bridge carries county road 130 across the Great Miami River about two miles southeast of Bloom Center, Logan County, Ohio. Built in 1876 by the Anderson Green Company of Sidney for $3,103, it uses the Howe truss, patented by William Howe in 1840, which replaced wooden verticals with iron rods that could be tightened with turnbuckles as a bridge sagged. The bridge has 13 panels, measures 142 feet overall with a 134-foot clear span, and has vertical board siding, a metal roof and projecting portals. Stone abutments, laid by T. B. Stillwell, are faced with concrete, and steel I beams reinforce the floor. It is named for Nicholas McColly, an early landowner nearby. Only 18 Howe truss covered bridges were said to remain in Ohio, and this one is considered among the better examples, kept in very good condition by the county engineer.","period_of_significance":"1876","architect_builder":"Anderson Green Company of Sidney, Ohio (builder); T. B. Stillwell (stonework of abutments and wingwalls)","architectural_style":null,"criteria":[],"status_note":"Described as kept in very good condition, with the floor system reinforced with steel I beams and the stone abutments reinforced with concrete; the form lists it as occupied and in transportation use.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:53:09.990136-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_OH/75001458.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/75001458/e6a8dd6235-800.webp","url_1600":"https://nationalhistoricalregister.com/media/75001458/e6a8dd6235-1600.webp","licence":"Public domain","author":"User:Nyttend","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:McColly_Covered_Bridge.jpg\" rel=\"noopener\">User:Nyttend</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:McColly_Covered_Bridge.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71989750","wikipedia":"https://en.wikipedia.org/wiki/McColly_Covered_Bridge","wikidata":"https://www.wikidata.org/wiki/Q6800440"},"indexable":true,"url":"https://nationalhistoricalregister.com/ohio/logan-county/mccolly-covered-bridge-75001458/"}