Free: Contests & Raffles.
If you don't remove the beaver they will keep building the dam back. Who says you can't bust up a beaver dam. I'd like to read that rule.
If you remove a dam by hand you're probably OK. If you want to bring in equipment you better have a hydraulic permit in hand.Dynamite, lots of luck getting that and even more luck getting a permit to use it in a stream. Not going to happen.