Madison is real sketchy from what I’ve heard. I wouldn’t recommend vehicle traffic there unless it’s 4-wheeler or snowmobile (or walking). I’d stay away from the narrows unless on foot.
Clear Lake (by Lexington?) I’ve heard has 20″, but I believe there’s an aerator on that lake, so 4-wheeler, snowmobile or walking might be better.
Tetonka, Washington, Jefferson, German all have 20″ – 28″ of ice yet. Watch out on Washington as there was some open spots in Baker’s Bay a few weeks ago, but they are marked. Tetonka – I’d just stay away from Willow Pt. with trucks and steer clear of the Cannon River inlet/outlet with trucks. Otherwise, on these lakes, there has been truck traffice (including myself).
Forecast is for 40’s this weekend and mid 40’s for most of next week. So I’d say truck traffic will be a big no-go very soon, if not already on some lakes. Check with local bait shops as well and use your best judgement.
Good luck!