I just was assigned your question, so please pardon the delayed response. First, we need to ensure that they are actually gophers -- many things are called gophers that actually aren't, such as prairie dogs and ground squirrels. Depending on what species we are dealing with, there are different legal methods to control the animal. If you still need help with this problem, there are definitely a lot of Extension folks that can help you resolve the issue in time for next spring. Please email me at firstname.lastname@example.org with a photo of the animal in question and I will help you resolve this issue quickly.