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.

For most leisure boaters in the Iowa Great Lakes, there are 2 main hot spots to go throw an anchor, sit back, and just relax. Sometimes this will result in numerous boats tying up to one another (you may not even know your neighbor), and sometimes it results in a little more privacy where you can chill just by yourself. Every weekend, boaters make the trek across the deepest parts of West Lake to either Gull Point (North AND South side) and Miller's Bay. Thought there are many other great areas to throw an anchor, relax, and swim, these are the two hot spots. If you aren't sure where to go on a Saturday afternoon or wonder where your friends might be, these two spots would be a good start.

Haywards Bay on West Lake Okoboji boasts low approaches and one of the few areas on West Lake to offer sand beaches. Renowned for the "bay of the flags", you will know you are in Haywards bay because of the all the American flags on the end of the docks. Fishing is great in Haywards Bay and the sunsets are one in a million. To get to Haywards Bay by car, one would drive the east side of the lake on Lakeshore Dr.