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.

Boulders Inn and Suites promises to make your Okoboji vacation comfortable and relaxing. This new hotel just south of Emerald Hills golf course between Milford and Arnolds Park offers 40 rooms with suites to meet your individual needs. One of the best things about Boulders Inn is that it is within walking distance of the Taco House. For some of you, I know that can be a big deal!

Arrowood is a year-round conference center and hotel with over 100 guest rooms, whirlpool suites and a "Great Room" for hosting group events and hospitality suites. Formerly known as Village East, the resort offers an outdoor pool, deck, playground, volleyball and croquet courts and a heated indoor pool area. Hotel goers can also enjoy an on-site salon, Minervas Bar and Eatery and lit parking. Located on Brooks National Golf Course, Arrowwood Resort offers some of the finest lodging around. Years ago, Brooks Golf Course clubhouse was actually housed on the rear side of Arrowood, but since then, the course has been converted to 27 holes with a a new separate clubhouse. Also, the Racquet Club was a part of the facility, offering workout facilities, racquet ball, and tennis. However, with the addition of the YMCA, the racquet club was unsustainable and converted into retail.