{"nrhp_refnum":"80001358","name":"London Mills Bridge","other_names":[],"category":"structure","location":{"address":"SR 39","address_restricted":false,"city":"London Mills","county":"Fulton County","state":"IL","lat":40.71006220600003,"lon":-90.26680812199999,"geom_source":"nps_gis"},"listed_date":"1980-10-29","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Engineering","Transportation"],"significance_levels":["state"],"summary":{"what_it_is":"A single-span metal truss highway bridge carrying County Highway 39 over the Spoon River at the north edge of London Mills, Fulton County, Illinois, with a construction date of 1883. It is part of a thematic group of metal highway bridges in Fulton County.","why_significant":"It is one of a collection of surviving metal truss bridges (1883-1915) in Fulton County that shows the improvement of the highway system as fords, ferries and iron bridges were replaced by steel trusses. The group illustrates changes in truss design, particularly the Pratt and Parker through trusses, over about 35 years. The state evaluated its significance at the state level.","narrative":"Carrying County Highway 39 across the Spoon River at the north edge of London Mills, this metal truss bridge dates to 1883. Drawings show a main span built as a through Pratt truss of eight panels, about 130 feet long, with additional approach spans of simple truss design supported on stone and steel piers and concrete abutments. A nameplate on the structure refers to a Cleveland, Ohio, bridge company. The bridge is posted for a six-ton load. It was nominated as one of several metal highway bridges in Fulton County. Together they represent the period from 1883 to 1915, when the county replaced fords, ferries and early iron bridges with steel trusses suited to growing traffic. The group shows changes in bridge construction, especially the Pratt and Parker through trusses, across about thirty-five years. The state evaluated this bridge as significant at the state level, and it was entered in the register in October 1980.","period_of_significance":null,"architect_builder":null,"architectural_style":"Through Pratt truss main span with pin-connected and riveted members","criteria":[],"status_note":"Posted for a 6-ton load limit; the thematic group is described as generally in good condition, though plans exist to replace several bridges.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:35.134401-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/46/8911/28891146/content/electronic-records/rg-079/NPS_IL/80001358.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/80001358/9b8e6521b8-800.webp","url_1600":"https://nationalhistoricalregister.com/media/80001358/9b8e6521b8-1600.webp","licence":"Public domain","author":"Thomas J. Foley","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Fulton_County_London_Mills_Bridge1.jpg\" rel=\"noopener\">Thomas J. Foley</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Fulton_County_London_Mills_Bridge1.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/28891146","wikipedia":"https://en.wikipedia.org/wiki/London_Mills_Bridge","wikidata":"https://www.wikidata.org/wiki/Q6670593"},"indexable":true,"url":"https://nationalhistoricalregister.com/illinois/fulton-county/london-mills-bridge-80001358/"}