Residents in any state which has bodies of water that ice over are warned to be careful on ice.
Most wildlife agencies warn people not to fish unless the ice is at least 4 inches thick and shouldn't use all-terrain vehicles unless the ice is at least 5 inches thick.
They also remind people that lakes, ponds, rivers and streams don't freeze at the same rates, even on the same body of water. They say flowing water, sandy or vegetated areas and wind can make ice thinner.
Wildlife officers say wearing a lifejacket or carrying ice hooks, rope or even a whistle can increase a person's chances of surviving if they fall through the ice. They also recommend that people don't go out on the ice on their own.
The United State Coast Guard never considers any ice as safe.