Key Points: Most lakes contain freshwater which makes them unsuitable for most shark species which are adapted to survival in saltwater. There are, however, exceptions to the rule: bull sharks are capable of living in either fresh or saltwater.
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1. Lake Nicaragua in Nicaragua. Bull sharks travel to Lake Nicaragua by jumping a series of rapids. Bull sharks travel up the San Juan River to Lake Nicaragua and sometimes spend years in the lake before returning to the Caribbean Ocean.
There are no sharks in Lake Michigan. Most sharks require salt water and most freshwater sharks don't live anywhere near the Great Lakes. Periodically there are rumors of Bull sharks swimming up the Mississippi River and into the Illinois River to get to Lake Michigan, but this would be an unlikely journey.
The bull shark is commonly found worldwide in coastal areas of warm oceans, in rivers and lakes, and occasionally salt and freshwater streams if they are deep enough.
But Bull Sharks are able to recycle salt in their kidneys, maintaining salt levels critical to its survival. Yet even the Bull Shark would not be able to make its way into the Great Lakes watershed and survive! The water temperature in the Great Lakes is far too cold for most sharks (including the Bull Shark).