Walleyes don't live in our large rivers around here, but I know some about fishing for them from what I have read and researched.
Walleyes will be found mostly in areas with reduced current. Eddies near creek mouths and below wing dams are prime for peppering casts with jigs and livebait.
In fall, winter, and spring, walleyes will stack below large dams in the 30 - 40 feet scour holes beneath the gates. It's in these conditions that numbers of walleyes are easiest to come by. Heavier jigs and jigging spoons are great presentations. Drifting slip bobber rigs with the current can be good too, although I would say jigging spoons and plastics would be best.
Tyler