Peter,
I fish in a river similar to the one you described for smallies. I suggest if it is a slow moving current I throw a Zoom trickworm weightless T-riged, Watermelon Candy or Pumpkinseed. Another softplastic i throw is a a Hula Grub made by chompers with a small jig head weight attached. I have never had to deviate from these two baits for river smallies. They simply tear it up. Good luck.