Here's a link with a few ideas for you:
Hi Nelda: To repel gophers naturally, try putting a few drops of peppermint oil on cotton balls, and then placing the cotton balls inside tunnel entrances. Gophers do not like the smell of peppermint, so this non-lethal gopher control method is a natural gopher repellent that can help rid your yard of these subterranean rodents.
The gopher pellets work, just put a brick or rock over their holes.,
My mother would leave a hose to trickle because they do not like a damp home. My neighbor would put a small amount of gasoline on a rag and push it into the hole. They do not like the smell and move out.