From wiki: “.Bull sharks have occasionally been seen in the Mississippi River as far north as St. Louis[10]. Even more rare, due to cooler waters, bull sharks have made their way up the Illinois River and into Lake Michigan such as an encounter off the coast of Chicago, Illinois[11]. In that incident the shark was verified by U. of Illinois biologists as being a female 6 feet 9 inches and weighing over 300 lbs.”
WOW!
Back in the 80’s they caught a 12’ Bullshark in the Bush river in the Northern Chesapeake Bay in Maryland.