While the colder temps have helped build the ice on the later freezing lakes, one should always be wary of changing conditions. Especially on larger lakes like Gunflint and Seagull and Saganaga – pressure ridges can form at any time. More likely to occurr when there are extreme changes in the temperature, cracks in the ice can occur at any time opening up and allowing water to flood an area. The two opposing ice sheets may also force together and much like plate tectonics, layer over on another leaving great ice ridges across open expanses or along shorelines. These can form over a couple days or hours. What might not have been there during your daylight ride to a destination, may suddenly “pop-up” or crack open, changing your evening twilight or moonlit return trip dramatically!
Always use caution and common sense. – Safe Travels.