Looking for some advice or past experience in dealing with gophers (more precisely the damage they can do to earthen dams). Recently one finally dug his way through my earthen dam and dewatered most of my pond overnight.

I've read the previous post from Sniper and understand gopher traps, poisons, and toxic gases can be effective tool for removal. In addition to gopher removal, I'm looking for preventative measures (e.g. wire cloth, rock/gravel layers, etc.). Any info will be useful since I've never targeted gophers before.