When Michigan's many lakes and rivers form ice, it can be hard to stay away. Some ice isn't worth stepping onto, experts say.

As the water at Presque Isle State Park freezes over, ice dunes are beginning to form on the shores. They may look wonderous, but they can be dangerous, according to officials. DCNR Ranger Supervisor ...

"Shelf ice is inherently unstable. In many places shelf ice cannot support a person’s weight. Sudden shifting and breaking of the ice make it especially hazardous. Never step onto shelf ice.