A buddy was out on Wed. on a lake about 50 miles N or St. Cloud. GThere were still full sixed trucks driving out.
I have made that mistake before at this time of the year. Drove out and drilled a bunch of holes. Seemed like a good 20″ of ice. About 10:00 decide to drill a few more and there was 8-10″ of good ice and the rest was honeycomb. Packed it up and left as quick as I could.