Driving into Saint Louis from the East, one can't help but notice the Casino Queen . Saint Louis is one of a few cities that allows riverboats like the Casino Queen. The holding company that owns the Casino Queen in East St. Louis on Thursday announced it would purchase a riverboat casino in Iowa. Late Nights. Action. Romance. Where Loose Means More. Visit us at The Arch! East Riverfront St. Louis. The Flop, The Turn, The River. Casino Queen Marquette.