I use those metal traps that jack them with the sharp spikes. My girfriend says its cruel but it works. Take a long screwdriver and poke around till you find a soft spot betwen a couple of the mounds they make. Dig out a 1ft round plug of grass and put a trap in the hole in both directions. You have to use two traps. Use gloves so they cant smell you on the trap. Then put the plug back and wait about 3 days. Make sure you put a wire or something on the end of the traps so you can secure it with your screwdriver or the gopher can run down the hole with the trap. After I ace them I shove them back in the hole so the other gophers will not return to the same place. Good luck. I hate those little bastards!