The first riverboat casino docked in Dubuque was the Casino Belle at the Ice Harbor (close to where the National Mississippi River Museum is located). However Iowa was the first state in the USA to legalise riverboat casinos in 1991. In 1988 casinos and gambling was legalised only on Indiana reservations. The history of the Dubuque casinos is actually quite interesting. For more information visit the Privacy & Disclosure Policy here.Ĭasinos in Dubuque are 21+. In this guide you can find out the main differences between the two along with some handy tips for visiting.ĭisclosure: This post contains affilate links. They are more than just places to gamble though and have other facilities on offer. There are 2 large casinos in Dubuque Iowa, the Diamond Jo and the Q Casino (formally the Mystique).