I came across this article the other day and had not seen any printed information on this subject previously. So I thought some might be interested in it.
Ice Rules
As stated before, no ice is ever safe ice. However, many state agencies, such as the Minnesota Department of Natural Resources (DNR) have come up with a suggested amount of good, clear ice there should be on a body of water before venturing on it with various modes of transportation. Remember this is only a guide, use your instincts and knowledge and inspect the ice before venturing on it.
The DNR recommends the following activities be conducted when at there is at least the following amount of good clear ice on the water body.
Less than 4 inches STAY OFF! There is no reason to test the newly formed ice at this time.
4-6 Inches Ice fishing, foot travel in single-file lines, and small spaced seating on the ice should be safe, presuming the ice is clear and clean.
6-10 Inches Snowmobiles and ATVs can travel safely on good ice that is over inches thick.
10-16 Inches Small cars and pick-ups can begin to venture on to the ice. However, the DNR states that it is best to avoid driving on the ice whenever possible.
16+ Inches A medium-sized car or mid-size pickup can drive on good clear solid ice.
