Review for Diamond Jo Casino Dubuque Review For Tree Bar Google User May 20 '18 at 3:21 First time visit to Diamond Jo Casino on 5-18-18 was a disaster and embarrassment to the entire establishment and their staff. Their entire computer system was shutdown. . .no new membership enrollment and no gaming payouts from machines. . .they where forced to hand payout everyone. They need to hire someone that has some strong computer technical support to prevent a similar occurrence. Lot's of unhappy patrons. . .I'm surprised more local players didn't leave and go over to Q Casino. We left not even spending an hour because it was so ridiculous waiting for staff to come around and perform hand payouts when playing between slot machines. I will credit the staff for handling the situation as well as they could. View full site to comment or like