{"nrhp_refnum":"80001357","name":"Indian Ford Bridge","other_names":[],"category":"structure","location":{"address":"SR 20","address_restricted":false,"city":"London Mills","county":"Fulton County","state":"IL","lat":40.69034540900003,"lon":-90.29009739699995,"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 steel Pratt through truss highway bridge built about 1917, carrying County Highway 20 over the Spoon River about 1.5 miles southwest of London Mills, Fulton County, Illinois.","why_significant":"The bridge was nominated as part of a thematic group of metal highway bridges in Fulton County. The form evaluates its significance at the state level. It records the bridge as a surviving example of an early twentieth-century steel truss, but gives no extended statement of significance.","narrative":"Indian Ford Bridge is a steel Pratt through truss that carries County Highway 20 over the Spoon River, about one and a half miles southwest of London Mills in Fulton County, Illinois. Built around 1917, it has a single span with a bottom chord length of 140 feet and a top chord length of 100 feet. Its height is 23 feet and its roadway width is 17 feet. The truss members are rivet connected, and the structure rests on concrete abutments with a concrete deck. The bridge was documented in a 1979 survey of metal highway bridges by the Illinois Department of Conservation, and it was listed in 1980 as part of the Metal Highway Bridges of Fulton County thematic group. The form rates its significance at the state level. The surviving paperwork consists mostly of an inventory of dimensions and materials, so it gives little detail about the bridge's builder or its local history.","period_of_significance":null,"architect_builder":null,"architectural_style":"Pratt through truss","criteria":[],"status_note":null,"vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:34.876314-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/40/8911/28891140/content/electronic-records/rg-079/NPS_IL/80001357.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/80001357/3c2148ec09-800.webp","url_1600":"https://nationalhistoricalregister.com/media/80001357/3c2148ec09-1600.webp","licence":"Public domain","author":"Thomas J. Foley","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Fulton_County_Indian_Ford_Bridge1.jpg\" rel=\"noopener\">Thomas J. Foley</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Fulton_County_Indian_Ford_Bridge1.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/28891140","wikipedia":"https://en.wikipedia.org/wiki/Indian_Ford_Bridge","wikidata":"https://www.wikidata.org/wiki/Q6020322"},"indexable":true,"url":"https://nationalhistoricalregister.com/illinois/fulton-county/indian-ford-bridge-80001357/"}