Oh, the poor little varmits 😰{/sarcasm}
Time to import some rattlesnakes. Or perhaps move the firing range & use them for pop-up targets. 
Before someone says, "Suck'em up and relocate them." may we put them in your backyard?  You don't mind if they bring their fleas, do you?
I remember having to "control" a marmot colony building their new digs in an earthen dam. Fortunately we got it early. The folks downstream were grateful.