no clue what the official amounts are here, but ive been out in the car a few times already with no problems, roads are shitty, but driveable. my driveway has almost nothing, but the back of the house has a drift that was half way up the door (found that out the hard way). still comin down pretty good though. my guesstimate would be 14-16 inches, though because of the wind it doesnt seem as much