You should contact the owner of Liberty Tool Company. They are a old tool store here in Maine that is very famous. The man also runs a Museum dedicated to old tools across the road from this store. I have been in there and he has a slew of tools from the Indian Era to more modern times. It really is a gem of an old Toll Museum and its not far from me either. I consider myself blessed.
At any rate, here in Maine the laws might be different than they are where you live. But legally, the man would be stealing from the State if the creek (or stream as we call them) resided in Maine. A Landowner does not own any body of water, only up to the Mean Water Mark. The body of water belongs to the state by all rights. Of course you can stop people from being on your land and getting access to it, but the stream itself is the States property.
I have no intention of traveling from birth to the grave in a manicured and well preserved body; but rather I will skid in sideways, totally beat up, completely worn out, utterly exhausted and jump off my tractor and loudly yell, "Wow, this is what it took to feed a nation!"