I’ve lived at our current place for 19 years and never had gophers until last year. All of a sudden we were overrun with gophers. I trapped several last fall but could never get ahead. A few weeks ago, I gave up and called the gopher guys, a commercial trapping service. They showed up and set over 50 traps. Over the past 3 weeks, they caught 14. The activity has stopped (for now). They will return for the next 30 days if anymore activity is detected. It was worth the cost to me. I’m considering signing up for their maintenance plan where they return every other month to search and destroy. Their strategy is simple: they set a trap at every active mound and check them weekly. They have several hundred traps at their disposal, so it’s a numbers game.