Yup, boat in a moat. In states with the riverboat laws that is the only way. They have gotten very good at hiding it, but it is under there. Seems silly that the state wouldn't just change the law and allow them to build only so close to the river, thus saving the casino a ton of money.

Here is more info:

http://www.hotel-online.com/News/2007_Jun_22/k.SLC.1182765315.html