Referred to locally as the lake turning over the thermocline is a feature of lakes with deep water. The water on the top of the lake changes temperature much more variably during the year. On West Lake, it can reach as much as 75 degrees in July while the water below, greater than 35 or 40 feet deep is relatively stable around 45 degrees. In the fall and early winter, the top strata of the lake will cool to below 45 degrees, and then because it becomes denser, it will "sink" below the lower strata, thus, displacing it and making the lake "turn-over". In the deepest part of West Lake (near the 136ft mark), no light is availble, and hence little life is known whether fish or plant. Typically questions are raised as to why the surface water gets dirty for a short period of time in the fall, this this is the standard answer.

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Terrace Park is located in Brown's Bay on West Lake, Okoboji. It is one of the largest public beaches on West Lake and has entertained beach goers for many years. Next to Terrace Park is Boys Town out of Omaha, Nebraska. I remember as a kid spending entire days at terrace park, either riding bicycle or taking a moped (yes a moped) down to meet with friends and playing king on the dock. In 2010, the morning after "the storm", Terrace Park was carnage. Boat were stacked on top of each other. Trees were uprooted, and hoists were tossed around. Boats and other water craft were found in Terrace Park that belonged to owners on the North end of West Lake.