Don't use the calendar to determine the thickness of the ice . Get out and check. Remember that snow fall actually insulates the ice from the cold air. So that ice doesn't freeze into thicknesses that can support heavy weight in small areas. The ice must be over one foot thick to support one heavy truck ( transport ). Several smaller trucks/cars can easily add up to the same weight fairly quickly. This year the ice has not got to the thicknesses of years past. Be careful out there.