Three way swivel rigs should also be productive. From a 3 way swivel that is tied to main line, 18 inches to 3 feet down is the sinker(1 ounce). To the other swivel tie a three foot fluorocarbon leader. On this leader you can use live baits, spoons, soft baits, crank baits(floating), spinners any favorite bait. Drift slowly over gravel bars or humps. Not for fast trolling.
Works for several species depending on the bait you chose. These method gets crank baits deeper than they can normally get. If you use a lighter test line from the swivel to the weight, than the main line and the line to the bait you only lose the weight if you get hung up.