I have the same exact issue for the first time this winter. My house will be two years old in Ankeny in June. The driveway has probably been around longer than that as it was built. In the end though, it's side load (garages face the north), and driveway in front of the two car stall is two inches high on one end and 1 inch high on the other. It didn't do it last winter but did this winter. We've had some issues with our builder and even though it's out of time, they've said that if it doesn't come down they'll come fix it. we'll see if they follow through with that.