Quote:
Originally Posted by JKTrevecca
Those contour/depth lines on the chart aren't reliable in my experience. They give you an idea of the rise/fall/countour but depth accuracy is a whole different story. Especially on JPP. Rely on your sonar for depth accuracy. Using the chart will get you in the repair shop asking for a new skeg or lower unit 
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Believe what JK is telling you here. There are many spots on JPP where your Navionics map will say you are in 20 ft of water when in reality you are in five ft or less....and this is at summer pool. If JPP is in full winter pool, the map will be off by a minimum of 7 ft!
They start pulling the lake down in November and start raising it back up in April, but the time frames are never written in stone. It is according to the amount of rainfall over the Cumberland Plateau.