Quote Originally Posted by Capt Cormorant View Post
What's deep water? One of the lakes I fish goes over 100fow. I think I read some where up to 40ft of water for winter? What's a good starting point? I will have a ton of water to search.

Thanks in advance...
If those deep lakes don't "turn over" then you wouldn't want to fish any deeper than the thermocline (if it exists).

FYI ... Thermocline is the depth where the warmest water in the lake sits on top of much cooler water (warm water is less dense).
"turnover" is when the weather cools off the upper warm layers of water to the point where that layer of water sinks through the lower part of the warm layer & mixes it all up. The faster & more extreme the turnover, or the more shallow areas which it occurs in, the more chance that bottom sediment will be disturbed in the mixing. This results in blackish water color & a "stink" (from the decaying matter on the bottom & the sulfur gases trapped in the sediment. A slower turnover may happen & may even go unnoticed ... except for noticing the falling temps on your depthfinder.

Another depth marker is where the dissolved oxygen content goes below 5mg/L ... as shown in this chart of one of the lakes I fish, which shows the Thermocline at ~ 30ft & the DO level drops below 5 at around 25ft deep.



This chart is from the COE & is taken at the dam of this lake, so the accuracy may suffer in far reaches of the lake.