I don’t fish the faster water right in a dam area, i’ve found that the slower water down river aways where it calms down is better. I fish the same areas that i fish in the warmer months, like slower or calm water next to deeper faster water. Depth isn’t neccessarily a big diffrence compared to the speed of the water because i’ve gotten most my hits in 3′ to 6′ of water. I avoid faster water because its never produced like slower or calm water next to faster water. I fish this cut and i fish it slow with a small jig, 3/32nds to 1/8th and the biggest minnow i can find to slow the fall. I work the jig slow, quite a bit slower than summer water and i have better luck when its tipped with a minnow, i’ve got most of my hits within 16″ off the bottom in the cedar, iowa and wapsi. I’ve had better luck on the wapsi and iowa through the winter than the cedar. Thay have almost always hit it on the fall when it gets close to the bottom just befor hitting it. I use a small boat and get positioned on the upper end of the cut or breakline and cast down into the cut, let it hit bottom and just let it sit for a few seconds then work it back slow always making contact with the bottom when the jig falls. Sometimes they hammer it hard and almost always hit it good and solid.