This topic kind of went sideways, but I'm there with the idea of taking care of (and looking out for) your local stretch of river. I've been doing this for, well, it seems like forever although it's only a little over twelve years here on the Finley. You have to not only pick up litter, but call either the police (or sheriff) and also get with either the local Conservation Agent, or Operation Game Thief. Put the numbers in your cell phone, and use them.
I know the local CA's (Conservation Agents) are sick of hearing from me, but that's their problem:
IT'S THEIR JOB!
So call them. At the drop of a hat. Take cell phone pictures, get license plate numbers, "drop the dime" as the old saying goes.
For meth heads or other obviously "off their rocker" types, stay clear, but put the call in anyway, as soon as you can.
Another thing: DO NOT fire a shot into the air, you don't know where that thing went. Fire into the ground.
Actually, you shouldn't ever brandish a firearm, but that's a different topic, for another time.