{"nrhp_refnum":"75000643","name":"Old Stone Arch, National Road","other_names":[],"category":"structure","location":{"address":"Archer St.","address_restricted":false,"city":"Marshall","county":"Clark County","state":"IL","lat":39.38699758400003,"lon":-87.70833530999994,"geom_source":"nps_gis"},"listed_date":"1975-02-20","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Engineering","Transportation"],"significance_levels":["national","state","local"],"summary":{"what_it_is":"A single-span limestone arch bridge carrying a road at Archer Street near Marshall, Clark County, Illinois. It was built by the Army Engineers between 1828 and 1837 as part of the Old National Road.","why_significant":"The nomination argues the bridge is significant for its longevity and continuous use, and as an excellent example of competent engineering and reliable masonry arch construction. It is one of the few remaining vestiges of the original National Road construction in Clark County. It carried all U.S. Route 40 traffic until fall 1953.","narrative":"A limestone arch bridge on Archer Street near Marshall, Illinois, carries traffic over a 15-foot span with a height of 13.5 feet and a width of 50 feet. Army Engineers built it between 1828 and 1837 as part of the Old National Road, which began as the Cumberland Road and ran toward St. Louis. The stone was reportedly quarried in Indiana, floated down the Wabash River on a raft, and hauled to the site by ox cart. The stones were cut to fit and laid without bond, with keys cut in to prevent slippage. Four large wingwalls flank the arch. Mortar added to some joints in the 1930s and concrete placed at the downstream wingwall footings to stop scouring have not changed its basic original state. The bridge served all U.S. Route 40 traffic until 1953 and still handles roughly 1,300 vehicles daily. It was listed for its longevity, continuous use, and engineering.","period_of_significance":"Between 1828 and 1837 (19th Century)","architect_builder":"Army Engineers (Corps of Army Engineers); individual builder unknown","architectural_style":null,"criteria":[],"status_note":"In good condition and still in use as a connection from U.S. Route 40 to Marshall, carrying about 1,300 vehicles per day; basic structure in original state.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:34.535107-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/64/8918/28891864/content/electronic-records/rg-079/NPS_IL/75000643.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/75000643/766cffff4e-800.webp","url_1600":"https://nationalhistoricalregister.com/media/75000643/766cffff4e-1600.webp","licence":"Public domain","author":"Nyttend","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Old_Stone_Arch_at_Marshall.jpg\" rel=\"noopener\">Nyttend</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Old_Stone_Arch_at_Marshall.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/28891864","wikipedia":"https://en.wikipedia.org/wiki/Old_Stone_Arch_(Marshall,_Illinois)","wikidata":"https://www.wikidata.org/wiki/Q16896160"},"indexable":true,"url":"https://nationalhistoricalregister.com/illinois/clark-county/old-stone-arch-national-road-75000643/"}