I wouldn't put any structure deeper than 6-8 ft. I would put most of it in water that is 3-4 ft. The fish will spend most of the time at that depth and maybe a little shallower in the spring and early summer when you will be doing most of your fishing. I have some in 10 Ft water and I don't catch very many fish around them. My structure in the 2-3 ft water is probably my most productive spots. What kind of structure are you talking about?