{"nrhp_refnum":"78001137","name":"Sylvan Road Bridge","other_names":["Bridge Over Ravine,Glencoe,Il."],"category":"site","location":{"address":"Sylvan Rd.","address_restricted":false,"city":"Glencoe","county":"Cook County","state":"IL","lat":42.14436154500004,"lon":-87.76344146699995,"geom_source":"nps_gis"},"listed_date":"1978-06-23","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Architecture"],"significance_levels":["national"],"summary":{"what_it_is":"A one-lane concrete bridge for vehicles and pedestrians on Sylvan Road, spanning a wooded ravine in northeast Glencoe, Cook County, Illinois. It was designed by Frank Lloyd Wright in 1911-1912 and built in 1915.","why_significant":"The nomination argues the bridge is architecturally significant because, according to the Frank Lloyd Wright Foundation, it is the only bridge in the United States designed by Wright. Its basic structure and features have remained unchanged since construction. It sits in a neighborhood with six other Wright-designed homes and is treated as a community asset.","narrative":"A small concrete bridge carries Sylvan Road across a ravine in a wooded residential part of northeast Glencoe, Illinois. It is a one-lane crossing for vehicles and pedestrians, with walls rising about two feet above the deck, a built-in sitting area, concrete pillars and supports, a curved semicircular support near the ground, simple light fixtures at each end, and ornamental flower urns. Frank Lloyd Wright designed it around 1911-1912, and it was built in 1915. According to the Frank Lloyd Wright Foundation, it is the only bridge in the United States he designed. It was meant to lead to a large house, referred to as the Booth house, which was never built there. Six Wright-designed homes stand nearby. The nomination notes that the basic structure and features remained unchanged for about sixty-two years, that visitors come from around the world, and that residents have asked the Village, which owns it, to restore its Wright features.","period_of_significance":null,"architect_builder":"Frank Lloyd Wright","architectural_style":null,"criteria":[],"status_note":"Owned by the Village of Glencoe and in public use for transportation; residents have asked the Village to restore its Wright features. Reviewer notes mention some deterioration.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:35.137544-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/78/8921/28892178/content/electronic-records/rg-079/NPS_IL/78001137.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/78001137/3b5a36caab-800.webp","url_1600":"https://nationalhistoricalregister.com/media/78001137/3b5a36caab-1600.webp","licence":"Public domain","author":"Uploaded by en:User:Waltloc (Transfered by archinform/Original uploaded by Waltloc)","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Ravine_Bluffs_Development_Bridge,_cropped,_(HAER,_ILL,_16-GLENC,_3-7).jpg\" rel=\"noopener\">Uploaded by en:User:Waltloc (Transfered by archinform/Original uploaded by Waltloc)</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Ravine_Bluffs_Development_Bridge,_cropped,_(HAER,_ILL,_16-GLENC,_3-7).jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/28892178","wikipedia":"https://en.wikipedia.org/wiki/Ravine_Bluffs_Development","wikidata":"https://www.wikidata.org/wiki/Q7296752"},"indexable":true,"url":"https://nationalhistoricalregister.com/illinois/cook-county/sylvan-road-bridge-78001137/"}