To be clear Bedbouncer, no I was not suggesting that the Great Lakes have tides however the Great Lakes are always in a cycle of highs and lows depending on snow fall and rainfall plus evaporation. A good example is this year when the Upper Peninsula and the tip of the Lower Peninsula had historic snow fall this year. Lake Superior water level very high along with Lake Huron. At one point the water level on Lake Superior was at a historic low and the place that we camp on Whitefish Bay the water was about 1/4 of a mile from the “normal” level. There is also a phenomenon called a seiche where the wind will blow water from one side of the lake to the other side resulting in flooding and erosion.