Get RId of Gophers a Whack Upside the Head Should do.
Getting rid of Gophers is like getting rid of moles. Traps work best. My neighbor would argue that a 12 gauge works better but he is retired and has more time on his hands and if I was retired I would probably have a 12 gauge. One large rat trap in a runway perpendicular should do the trick just cover the hole you dug to locate and set the trap with a piece of plywood or bucket. Voles, mice and rats and other vermin will use runways that other critters such as moles and gophers have dug.