This boat's operation was short-lived, however, and relocated to Missouri in 1993, following a change in ownership. On April 1, 1991, the Dubuque Racing Association (DRA) and local businessman Robert Kehl opened Iowa's first riverboat casino in Dubuque's Ice Harbor, the Casino Belle.

The operation had 3 restaurants: the Diamond Deli, HighSteaks Restaurant, and Jo's Café. It has 777 slot, keno, and video poker games, and 17 table games, including: Big Raise Hold 'em, Blackjack, Craps, Four card poker, Let It Ride, Roulette, Texas Hold 'em, and Three card poker. The casino, along with the nearby National Mississippi River Museum & Aquarium and other attractions, have helped to create a large and growing tourism market in Dubuque.Īs a riverboat operation the Diamond Jo was the smaller of Dubuque's two casinos, with 19,600 square feet (1,820 m 2) of gaming space. The Diamond Jo Casino is located at 301 Bell Street, in the rapidly developing Port of Dubuque. The boat was a dockside that did not cruise, the casino became land-based when its new facility opened December 11, 2008. Beginning operations on May 18, 1994, the Diamond Jo was a 3-level, 305-foot (93 m), 1,500-passenger vessel in Dubuque's Ice Harbor.

It is a member of the Iowa Gaming Association, and its license is held by the Dubuque Racing Association, which operates Q Casino. The casino is owned and operated by Las Vegas-based Boyd Gaming, which also owns the Diamond Jo Casino - Worth in Northwood, Iowa. The Diamond Jo Casino is a gambling casino and entertainment complex located in the Port of Dubuque, in Dubuque, Iowa.

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