Lake Superior is 700 feet deep. Lake Superior has an average annual temperature of 40 degrees which moderates the climate making winters warmer and summers cooler. Lake Superior is the cleanest, coldest, and clearest of the Great Lakes. These gales with strong winds and rain are the cause of most of the 350 shipwrecks that have occurred on the lake. There is really no tidal motion caused by the gravitational pull of the sun and moon in Lake Superior.
Seiches occur when water is piled up on one side of the lake by wind or high barometric pressure.
When this force shifts, the water rocks back and forth from one shore to the other like water in a pan that has been tipped and laid flat. Such seiches can affect water levels anywhere from 3 inches to 3 feet or more. We are open year-round.