{"nrhp_refnum":"99000586","name":"Third St. Bridge","other_names":["090-9912","Municipal Street MS 2800"],"category":"structure","location":{"address":"Third St., bet. Pine and Elm Sts.","address_restricted":false,"city":"Delavan","county":"Tazewell County","state":"IL","lat":40.37353676500004,"lon":-89.54440134299995,"geom_source":"nps_gis"},"listed_date":"1999-05-20","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Engineering"],"significance_levels":["state"],"summary":{"what_it_is":"A two-span pony truss bridge carrying Third Street over railroad tracks in Delavan, Tazewell County, Illinois. The main span is a metal double-intersection Warren lattice truss built between 1870 and 1881 for rail use and moved to Delavan in 1907 for road use.","why_significant":"The nomination presents it as the only known double-intersection Warren lattice truss in Tazewell County and one of two known in Illinois. A name plate evidence led the Illinois Historic Bridge Survey to identify it as the oldest known metal truss bridge in the state. It also reflects the local railroad history that created the need for a Third Street crossing.","narrative":"Third Street Bridge carries Third Street over two sets of railroad tracks in Delavan, Illinois. Its main span is a 62-foot, six-inch metal pony truss of the quadrangular double-intersection Warren lattice type, with eight panels, riveted connections and wrought iron chords. A short timber approach span and a metal lattice pier support the east end. The truss was built between 1870 and 1881 to carry trains and was moved to Delavan in 1907, when it was converted for vehicles and pedestrians. A name plate reading Kellogg Bridge Co., Buffalo, N.Y., led the state bridge survey to rate it the oldest known metal truss bridge in Illinois. It is the only example of its type known in Tazewell County and one of two in the state. The truss remains sound, though the floor beams, stringers and timber deck are in poor condition. The form lists the bridge as vacant and not in use.","period_of_significance":null,"architect_builder":"Kellogg Bridge Co., Buffalo, N.Y. (from name plate)","architectural_style":"Double intersection Warren pony truss","criteria":[],"status_note":"Listed current function is vacant / not in use. The truss is described as fundamentally sound, while the floor beams, stringers and deck are in poor condition and need replacement.","vacant_flag":true,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:37.473142-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/92/8941/28894192/content/electronic-records/rg-079/NPS_IL/99000586.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/99000586/630801f7d0-800.webp","url_1600":"https://nationalhistoricalregister.com/media/99000586/630801f7d0-1600.webp","licence":"CC0","author":"Ammodramus","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Delavan,_Illinois_Third_Street_bridge_from_S_2.jpg\" rel=\"noopener\">Ammodramus</a>, <a href=\"http://creativecommons.org/publicdomain/zero/1.0/deed.en\" rel=\"license noopener\">CC0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Delavan,_Illinois_Third_Street_bridge_from_S_2.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/28894192","wikipedia":"https://en.wikipedia.org/wiki/Third_Street_Bridge_(Delavan,_Illinois)","wikidata":"https://www.wikidata.org/wiki/Q24435829"},"indexable":true,"url":"https://nationalhistoricalregister.com/illinois/tazewell-county/third-st-bridge-99000586/"}