If you can plug all the entrances, you can gas them to death. There are poison smoke bombs for the purpose or you could dump some potassium cyanide down the hole, add some water and plug the entrance.

I get these critters where the back yard falls away into a wooded ravine. They dig their tunnels right at the edge and if left to do their work, cause severe erosion of the area because of rain water washing through the tunnels. Shooting them isn't legal inside our city limits and they're so shy they run at the slightest sound so it's hard to draw a bead on one.

I'd estimate the weight of the groundhogs I get at 18 - 25 lbs. My neighbor traps them and releases them on the other side of the river. He uses a wire live-trap.

      - Mark