I drove out and checked on Biglake, Rocky Lake and Beaver lake today. Forgot to get pictures of Biglake but over by the old Lodge there was around 50 feet of open water on the edges. Keep in mind my camera makes it look a lot more open than they really are.
Here is Rocky Lake... Looks to be open enough to fish with a canoe along the camp ground side, open out roughly 50 feet give or take 10 feet. There was ice in front of the boat launch though. Didnt get out to see but I cant imagine its very thick.
And here is Beaver lake. Dont let the pictures fool you, its only open out 20-30 feet at the biggest area.
There was another lake in the area I checked (Secret spot) that also had very little open water.