The Army Corps of Engineers says water levels will most likely remain high throughout 2020 for a host of factors. Some are easily identified like forecasts for a wetter than average winter but others are less evident. Lakes Huron and Michigan are the only Great Lakes to avoid making a record high this year. Lake Superior did and that has a trickle-down effect elsewhere according to Chief of Watershed Hydrology Keith Kompoltowicz.
The Farmer's Almanac has predicted a very cold winter for the Upper Midwest. If the Great Lakes freeze over like last year that would contribute to lake levels as well.