[1] It was replaced by a larger riverboat, the Alton Belle II, in 1993, and cruised for one hour to meet legal requirements.

Missouri allowed casinos in 1994, which quickly led to competition in the St. Louis metro area.

[3] Furthermore, in January 2008, Illinois declared all casinos smoke-free, while Missouri lifted a $500 loss limit in November 2008, both having increased negative effects on the Argosy.

Revenue in November 2011 had fallen to $5.6 million, the lowest of all St. Louis area casinos.

[4] The Argosy Alton was closed briefly in May 2019 due to flooding on the Mississippi River.