The average depth of Lake Superior is 483 feet with the maximum depth of 1,333 feet. And while the surface temperature during the summer may be warm enough for a refreshing swim, the average temperature is forty degrees. Seiches, which mask Lake Superior’s tiny tide, are caused by wind or pressure piling water to one side and when the wind or pressure change stops pushing, the water returns and the water sloshes back and forth until it is level again. The seiches can change shore water levels by more than 3 feet.
Lots of Chilly Water
