You don’t swim in rivers here. There are too many alligators, big snapping turtles, and water moccasins that will get you.
There are no alligators in Ohio. Snappers and water moccasins, ok.
And brain eating amoebas.
People in ohio swim in rivers all the time. Snapping turtles and water moccasins won’t bother you, they clear out because they want to be left alone and you just scared off all their prey. If you aren’t a stringer full of fish they aren’t interested in you. To get bit by either the snapper or a moccasin/cottonmouth, you pretty much have to stick your foot right in their mouth, or step right on them forcing them to react.
Here in Florida where there are gators too, you just stay sober, don’t splash around like a wounded deer, and don’t swim during gator evening dinner hours. Most animals aren’t interested in dining until after the heat of day, after 4 pm.