I meant the other end of the Mississippi. Here is an excerpt from an article stumbled across.
Bad customers: The most dangerous shark is arguably the great white, a large, aggressive predator. The second-most dangerous in U.S. waters is likely the bull shark, a large (up to 12 feet), aggressive animal that is only one of two shark species to regularly enter fresh water, traveling up the Mississippi River as far as the Ohio River. A third dangerous species is the tiger shark, which can grow to 20 feet. Tiger sharks sometimes eat people, whereas other species seem to attack humans primarily when mistaking them for typical prey, such as sea lions. This species of shark has been found as far as Iowa and Minnesota, in the Mississippi River, as well as the Ohio River.