To stop (or at least slow down) my woodchuck invasion the first thing I did was retrace his steps. There was an obvious hole in the vegetable garden fence (buried bird netting on 2x2 posts) that he must have bit his way through. So I knew how he got into the garden area. But where did he get into the yard?
Ah-ha! Here's the hole. Now if this was where he lived, all I would need is some dynamite and the woodchuck problem would be over. But this is just a short tunnel that goes from my neighbor's yard, under our fence and into my yard.
Now over the past two weeks, I've filled this hole in at least 4 times. And if you look closely, you can even see the chicken wire that I buried in there too. It's right next to the buried hose that I use to get water up to the garden. Every time I fill in the hose or block it with chicken wire, a big heavy bag of dirt or anything else I can get my hands on, the woodchuck just keeps digging until he gets around my obstacle. Sure is a persistent little varmit.
It seems like I'm going to lose the battle to keep the woodchuck out of my yard so I'm going to fall back and concentrate on protecting the vegetable garden instead. This war is not over yet.