Last weekend I was out on silver lake behind chicks lumber and we are on about 10 inches of ice, half honey comb ice and half perfect clear black ice. I saw quite a few snowmobile tracks out there as well. plenty for walking, I think I'd start to consider bringing a sled or quad on the ice about now. Make sure you talk to a local before venturing out on some of the bays, really nasty springs and inlets on the lake especaily with the snow, you would have no clue. I can point out a few spots that probably have less then 2 inches right now. be careful.
~Neal