I'm dealing with that right now but they are definitely muskrats. If you can't get any machinery back there that looks tough to fix!
In my case it's a dike which I will dig a slot in the center and put in a collar -- either cement or fiberglass. Then I will dig and fill the tunnel on each side of the collar.
Last edited by Cecil Baird1; 04/24/09 02:14 PM.