Gopher's and moles are commonly found in the same yard because they can be attracted to the same areas. Yard's that have very moist soil that creates a perfect environment for worms is what attracts the moles. The gophers come to these yards because they are perfect for vegetation to shrive. When you have a yard that has well watered soil you have the perfect yard, not only for you but for those pesky critter's that can destroy your yard.
It is important to identify what type of critter's you have in your yard before removing them. This can be very difficult between gopher's and moles.
For information on how to handle a mole or gopher removal problem in Oregon call 503-201-2432