One year I had a snowbank that lasted an extra 3 weeks into the spring. When it finally melted, the entire area under it was eaten up by voles. I was a bit worried about my perfect yard (that was back when I cared what my yard looked like). One month later the grass there had grown back and was better than the surrounding yard. So don't fret about the tunnels and missing grass patches.
And a comment about mouse traps for voles. If you do that, be sure that other critters can't get to the mouse trap. One spring I tried the mouse trap thing and came home from work to fine a baby robin with his foot in the trap. He was big enough to flap around the yard but he couldn't take off with the extra weight of the trap. I spent 5 minutes chasing him around the yard until i finally caught and released him. I don't think the neighbors saw me...
"Hundreds of years from now it will not matter what my bank account was, the sort of house I lived in or the type of car I drove... But the world may be different because I did something so bafflingly crazy that it becomes a tourist destination"
I guess I've been abducted by space aliens. So unprofessional. They tried to probe me with this tiny ad: