Many factors affect ice thickness including type of water, location, the time of year and other environmental factors such as:
Minimum ice thickness should be:
Remember - thickness is only one consideration while enjoying activities on ice, and the minimum thicknesses are guidelines only. Local conditions and the type of water body will affect the ice strength. Check with local authorities for information on local ice conditions before heading out on the ice. Obey posted signs indicating when and where ice surface is acceptable for activities. Avoid going out on ice at night.
When You Are Alone On Ice
If you get into trouble on ice and you're by yourself:
When You Are With Others On Ice