Hit big at Casino Queen, the best casino in Iowa! Formerly the Lady Luck, Casino Queen located in Marquette, IA offers Gaming, Entertainment, Dining and. Casino Queen Marquette is a 17, square feet (1, m 2) riverboat casino located in Marquette, Iowa that is owned and operated by CQ Holdings. During its lifetime, the riverboat generated $ million in state and local tax dollars. Last year, the Casino Queen moved its operations to a $92.