{"nrhp_refnum":"99000112","name":"Waltmire Bridge","other_names":[],"category":"structure","location":{"address":"Locust Rd. over Mackinaw River, approx. 4.9 mi. S of Tremont","address_restricted":false,"city":"Tremont","county":"Tazewell County","state":"IL","lat":40.450981719000026,"lon":-89.50416437499996,"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, eight-panel Pratt through truss bridge carrying Locust Road over the Mackinaw River, about 4.9 miles south of Tremont, Tazewell County, Illinois. It was built in 1910 by local contractor Edward Cooney.","why_significant":"The nomination finds it locally significant under Criterion C for engineering as an excellent example of a Pratt through truss metal bridge. It is one of only two Pratt through truss bridges in Tazewell County, both over the Mackinaw River, and it retains its historic integrity. At about 187 feet, it is longer than most Pratt through trusses, which are usually 25 to 150 feet.","narrative":"Waltmire Bridge carries Locust Road across the Mackinaw River about 4.9 miles south of Tremont, Illinois. Built in 1910 by Tazewell County contractor Edward Cooney for $7,988, it replaced a crossing known as Waltmire's Ford, where the river was hard to cross at high water. The structure is a single-span, eight-panel Pratt through truss, 187 feet 9 inches long and 16 feet 2 inches wide, with steel members, concrete abutments and a wood plank deck. Most deck planks have been replaced, but the bridge is otherwise basically unchanged since construction. It is listed for engineering significance as an excellent example of the Pratt through truss type, with vertical members in compression and diagonal eyebars in tension. Only two such bridges exist in Tazewell County, both over the Mackinaw River. The bridge still carries light local traffic under a 3 ton load limit, and a county survey found its abutments and upper steel structure in good condition.","period_of_significance":"1910","architect_builder":"COONEY, EDWARD, builder","architectural_style":"Other: Pratt through truss bridge","criteria":["C"],"status_note":"Open to light traffic with a 3 ton load limit; the upper structure is in good condition, though some structural steel repairs are needed beneath the deck.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:37.641194-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/94/8941/28894194/content/electronic-records/rg-079/NPS_IL/99000112.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/99000112/8b9d145c9c-800.webp","url_1600":"https://nationalhistoricalregister.com/media/99000112/8b9d145c9c-1600.webp","licence":"CC0","author":"Ammodramus","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Waltmire_Bridge_(Mackinaw_River)_from_SW_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:Waltmire_Bridge_(Mackinaw_River)_from_SW_2.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/28894194","wikipedia":"https://en.wikipedia.org/wiki/Waltmire_Bridge","wikidata":"https://www.wikidata.org/wiki/Q23822842"},"indexable":true,"url":"https://nationalhistoricalregister.com/illinois/tazewell-county/waltmire-bridge-99000112/"}