We have a family dam that is a little over five acres. There are crappie and perch in it, but the only fish I can catch with my tip downs are bass. Overall the dam is pretty shallow. Most of it is three to six feet with a small channel seven to twelve feet. The twelve foot depth is right at the spillway. I can't even catch a bluegill. I've been using ten homemade tip downs with four pound flouro, split shot, number fourteen treble, and fathead minnow. I've focused on deeper water and I've focused on the structure that I know of. The structure is in shallow water like three feet deep. Any ideas? I have no problem catching them in spring. Thanks.