Less than 4 inches: Stay off the ice. 4 inches: Walking, ice fishing, ice skating, or other activities on foot are permitted. 5 to 7 inches: Snowmobiling or riding ATVs are safe. 8 to 12 inches: Driving a car or small pickup is allowed.
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On average, it takes four days of below freezing temperatures to form ice that is safe. Also, this guideline is for ponds and lakes. Frozen streams should never be walked on as they freeze unevenly due to the movement of the water. Another thing to know is that clear ice is the strongest.
If you can see the ground through the ice, then there's going to be warmer water under it. Out in the middle, the ice grows thicker over the cold dark depths. Also, ice always melts away from the shore first.
As a general rule of thumb, ice is safe to walk on when there is 4 inches or more of clear ice. It is important to understand that different types of ice varying in their strength. Clear blue or black ice is the strongest.