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.
If it’s big and metal there’s a scrapyard that will, at the very least, take it off your hands for free. Free metal is free metal. Getting the big metal thing to the scrapyard is another story.