I'll be dipped! I grew up in St. Charles on the Fox before leaving for Colorado in '89. I remember in the '70's all the kids in school talking about this guy and no one knew who it was. Lots of speculation about some hippy science teacher at the local high school being the famous "Fox".
Here's what the Google machine kicked out https://patch.com/illinois/montgomer...ity-of-the-fox
The big scandal was when he plugged up a waste pipe in Elgin at a casket factory on the river or so the story goes.
That river is typical Midwest; wide, flat, great for canoeing and great for being a kid on.