I couldn't agree more. The floating Rapala in the 3" early in the year and 5" in the fall is one of my all time favourite Smallie baits (Pop-R is the other) I agree with the Perch recommendation but if there are shiners and such by the bridge, maybe try the Black and Silver. I always found that for holding fish, depending on how fast the current is actually cast down current, reel the bait upstream with some twitches and then let it flutter back to the top as it drifts down stream, repeat several times before re-casting. This technique is the same premise as fly fishing where you drift the bait past the fish over and over again.
Note, a lot of your strikes will comes as the Rapala is drifting back to the top....hang on, cause they'll rip the rod right out of your hand just before it hits the surface.
Best of luck,
CWeb