It is a member of the Iowa Gaming Association, and its license is held by the Dubuque Racing Association, which operates Q Casino. Beginning operations on May 18, 1994, the Diamond Jo was a 3-level, , 1,500-passenger vessel in Dubuque's Ice Harbor.
It is a part of the Iowa Gaming Association, and its license is managed by the Dubuque Racing Association, which operates Q Casino. Beginning operations on May 18, 1994, the Diamond Jo was a multi-level vessel with a capacity for 1,500 passengers in Dubuque's Ice Harbor.