I drilled a few at the visitors center on 01/20/16 and it was about 3,4 inches about 10 feet from shore. I'll be back out this evening to check again. There was a break in the ice that ran horizontal to the shore line about 50 feet out that looked suspect. I figure when its sealed up it should be safe for me to venture out a little further to check the thickness. I'll have my ice spikes safety first, but its calling me.