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A riverboat casino is a type of casino on a riverboat found in several states in the United States with frontage on the Mississippi River and its tributaries, or along the Gulf Coast. Several states authorized this type of casino in order to enable gaming but limit the areas where casinos could be constructed; it was a type of legal fiction as the riverboats were seldom if ever taken away from the dock.
Paddlewheel riverboats had long been used on the Mississippi River and its tributaries to transport passengers and freight. After railroads largely superseded them, in the 20th century, they were more frequently used for entertainment excursions, sometimes for several hours, than for passage among riverfront towns. They were often a way for people to escape the heat of the town, as well as to enjoy live music and dancing. Gambling was also common on the riverboats, in card games and via slot machines.
When riverboat casinos were first approved in the late 20th century by the states, which generally prohibited gaming on land, these casinos were required to be located on ships that could sail away from the dock. In some areas, gambling was allowed only when the ship was sailing, as in the traditional excursions. They were approved in states with frontage along the Mississippi and its tributaries, including Illinois, Indiana, Louisiana, Mississippi and Missouri.
As an example, in 1994 Missouri voters approved amending the state constitution to allow "games of chance" on the Mississippi and Missouri rivers. By 1998, "according to the state Gaming Commission, just three of the 16 operations comprising Missouri's $652-million riverboat gambling industry [were] clearly on the main river channel." The state supreme court had ruled that boats had to be "solely over and in contact with the surface" of the rivers. Several casinos had been located on riverboats located in a moat or an area with water adjacent to a navigable waterway, leading them to be referred to as "boats in moats." The state legislatures were unwilling to give up the revenues generated by gambling. Over time, they allowed gaming casinos to be built on stilts but they still had to be over navigable water.
Following Hurricane Katrina in 2005, which destroyed most riverboat casinos and their associated facilities of hotels, restaurants, etc., in states along the Gulf Coast, several states changed their enabling legislation or amended constitutions. They permitted such casinos to be built on land within certain geographic limits from a navigable waterway. Most of Mississippi's Gulf Coast riverboat casinos have been rebuilt since the hurricane.
- Sloca, Paul (18 January 1998). "Missouri's 'Boats in Moats' Get That Sinking Feeling". Associated Press. Retrieved 3 April 2015.
- Partial listing of permanently moored casinos, DeJong and Lebet, Inc., Naval Architects and Marine Designers