I drove up to take a look at the main lake on Saturday.
There were ice fisherman coming back from the Departure Point area but there was still open water down on the main lake near the dam so I would exercise extreme caution if you're thinking of going in that area.
I didn't drive up to Log Gulch or Departure Point so I won't guess on the thickness but saw several trucks come from that way so you should be good to go if you're planning on walking.