Erik:

Turnover for the most part will begin when the water temps are around 58-59. As the water cools, it sinks which forces up the warmer water from the depths. As this occurs, if the the lake has developed a thermocline (which the Fox Chain does) the thermocline will break down. Weather is the biggest key to how fast or how slow turover completes itself. Cool temperatures and wind are a plus. Usually, water temps will be in the 50-53 degree range once the process is over and the water colomns stabilize. At this point, the oxygen levels are the same thoughout the lake and the fishing should start to pickup again. Hope this helps!