Deep is relative to your flow. In my rivers, four feet is awful deep, and five or six feet is "crazy" deep. If these areas have slow or moderate current, that is where I start. Now, I will say I have caught many winter smallies in areas where it was shallower than four feet, but I will say that when I normally catch those shallow fish, deeper water is close by. John, hope this helps a little. YOu know you can call me at any time!!!