I fish lock 3 in the spring and fall, the river is too warm and shallow right now for me. Vertical jigging the lock walls, and bridges seems to work best. We use weighted jig heads tipped with a small plastic and a minnow. We also troll that section of the river, try to keep the speed under 2 mph. I would recommend using something that dives no deeper then 15 feet, orange/gold colors seem to work best.
Good luck, and watch your depth.