Top water on rivers

[pittsburghbass]

I've read a lot of posts about people fishing top water lures in the morning and in the evening, and I feel like I'm missing out. I never fish top water... maybe because I never found it very productive or maybe its the waters I normally fish. (I normally fish rivers)

So my question for you guys is which top water baits should I be using for a river with very little cover and lots of open water with a fairly slow current?

I always try to match my bait to the natural prey the fish are feeding on, and in my area there arent many frogs, lizards or the like for bass to feed on. So i've always had a hard time picking a top water lure. Any help would be appreciated, thanks!