{"nrhp_refnum":"04000169","name":"Peoria Lock and Dam Historic District","other_names":["Lock and Dam 7"],"category":"district","location":{"address":"1071 Wesley Rd.","address_restricted":false,"city":"Creve Coeur","county":"Tazewell County","state":"IL","lat":40.63190184900006,"lon":-89.62763422574602,"geom_source":"nps_gis"},"listed_date":"2004-03-10","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Transportation","Maritime History","Engineering"],"significance_levels":["national"],"summary":{"what_it_is":"A federally owned lock and dam complex on the Illinois River at Creve Coeur, Tazewell County, Illinois, built 1938-1939. It includes a lock, a wicket dam, a maneuver boat and a control station, with a 27.3-acre district boundary.","why_significant":"The district is argued to be significant under Criterion A for its role in the maritime, transportation and industrial history of the Illinois Waterway, a slackwater system linking Chicago and the Mississippi River. Under Criterion C it is a good example of Army Corps of Engineers lock and dam construction of the period. The wicket dam and its maneuver boat are described as rare resources, and the district retains a high degree of integrity.","narrative":"Peoria Lock and Dam, also called Lock and Dam 7, sits on the Illinois River at Creve Coeur, Illinois. Built in 1938 and 1939, it was part of a chain of slackwater facilities that let commercial barges and towboats travel the 336 miles of the Illinois Waterway between Chicago and the Mississippi River. The district has four contributing resources: an 11-foot-lift lock with a 110-by-600-foot chamber, a 536-foot concrete pier dam, Maneuver Boat No. 2, and a two-story brick control station designed by Paul LeGromwell. The dam is one of only two on the waterway that still use wicket gates, and the maneuver boat that raises and lowers them may be one of only four of its kind remaining in the country. The facility is considered significant for its part in regional transportation and industrial growth and as a representative Army Corps of Engineers design. Later changes, including a 1986 Tainter gate, have not removed its historic character.","period_of_significance":"1938-1951","architect_builder":"LeGromwell, Paul (control station designer); maneuver boat built by Calumet Shipyard and Dry Dock Company of South Chicago, Illinois","architectural_style":"Other: lock and dam; No style: control station","criteria":["A","C"],"status_note":"Described as a still-operating lock and dam facility; the lock and dam retain original appearance and function, with some equipment and surfaces replaced for continued operation.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:37.102615-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/62/8914/28891462/content/electronic-records/rg-079/NPS_IL/04000169.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/04000169/48483791bf-800.webp","url_1600":"https://nationalhistoricalregister.com/media/04000169/48483791bf-1600.webp","licence":"Public domain","author":"Grogan, Brian","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:AERIAL_VIEW_OF_PEORIA_LOCK_AND_DAM._LOOKING_WEST._-_Illinois_Waterway,_Peoria_Lock_and_Dam,_1071_Wesley_Road,_Creve_Coeur,_Tazewell_County,_IL_HAER_IL-164-B-31.tif\" rel=\"noopener\">Grogan, Brian</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:AERIAL_VIEW_OF_PEORIA_LOCK_AND_DAM._LOOKING_WEST._-_Illinois_Waterway,_Peoria_Lock_and_Dam,_1071_Wesley_Road,_Creve_Coeur,_Tazewell_County,_IL_HAER_IL-164-B-31.tif"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/28891462","wikipedia":"https://en.wikipedia.org/wiki/Peoria_Lock_and_Dam","wikidata":"https://www.wikidata.org/wiki/Q21197120"},"indexable":true,"url":"https://nationalhistoricalregister.com/illinois/tazewell-county/peoria-lock-and-dam-historic-district-04000169/"}