The water only being 47 is still cold.Look in deep holes that are in the river channel.Drag a 6' piece of 3/8 diam chain,tied to some strong anchor line.That will slow you down.Fish a tube very slowly,dragging it along the bottom.Once the water gets in the 50's Fish all rocks,logs,and any current break with a 1/2 oz spinnerbait,experiment with colors and retreives for your area.Don't waste your time time throwing plastics,cover lots of water.Not only will you catch more fish,you'll get the bigger fish.There's a time and place for plastics,and it ain't at feeding time,when they are really starting to eat , getting ready for the spawn....good luck