Answer: Gophers make quite a labrynith of tunnels; some are main runs, others are dug for ventilation, for nesting, and for waste. Some of these are seldom-used tunnels and don't necessarily mean the critters will be back with any frequency. On the other hand, he/she could be expanding the main run and just popped up at the end of the run. Of all the products on the market, the surest way of eliminating gophers is with a well-placed trap. If it were my yard, I'd wait to see if more tunnels appeared. If so, I'd get a trap.
Best wishes with your landscape!
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