I would suspect most small to medium sized lakes have plenty for a sled. Lakes like Bemidji, Cass, Plantagenet, etc. froze really unevenly. I would use extra caution especially on those bodies of water.
Dang, I had hoped conditions were improving with all the cold weather over the past two weeks. Was out in the south east end of Bemidji 2 weeks ago and had about 8-9 inches.