I have been watching magnet fishing and people love to toss stuff over bridges without a second thought on the environmental impact. Hiding evidence I can almost understand but not lawnmowers, car batteries, etc.
It seems deeper fines should be made to discourage this terrible behavior.
I may or may not have done this back in my youth. If I did, it was because I had no idea how to dispose of a broken engine block. Now, I could set it at the curb and a scrapper will have it in their truck within a couple hours.