You never know what’s living right beneath the planks of the dock, or hovering beneath the hull of the moored pontoon, or hiding within the limbs of the downed willow tree. You won’t know about some of the most fish-rich areas of the lake, that is, unless you deploy your underwater optics. To the fish themselves, artificial overhead cover provides the most obviously comfortable, appealing territory in any neighborhood, regardless of the lake. And in many lakes, given ample depth,…