🌐EnglishEnglishDeutschEntityQ1867486· pop 5· linked from 48 articlesLock and Dam No. 21Sign in to saveAlso known as Lock and Dam 21lock and dam on the Mississippi River at Quincy, Illinois, USAWikidata factsImageMississippi River Lock and Dam number 21 HAER.jpgSources (3)wikidata.orgarchinform.neten.wikipedia.orgvia Wikidata · CC0On the mapAvailable in 4 languagesDeutschCebuanoEgyptian Arabicvia Wikidata sitelinks · CC0ConnectionsNational Register of Historic PlacesEntityUnited States Army Corps of EngineersEntityCategories1938 establishments in Illinois1938 establishments in MissouriBuildings and structures in Marion County, MissouriBuildings and structures in Quincy, IllinoisDams completed in 1938Dams in MissouriDams on the Mississippi RiverDams on the National Register of Historic Places in IllinoisDams on the National Register of Historic Places in MissouriGravity damsHistoric American Engineering Record in Illinois