Too many variables with topwater fishing. I've got well over 100 different types and there are times when one size, one color and one type of retrieve were the only thing that worked. The clearer the water the pickier they are going to be as a general rule. Our waters get lots of pressure and Bass see lots of the same stuff, so size, color and presentation have to be considered.
For low light conditions stick to darker colors. If its bright and sunny, think light colors, almost clear. If the water is choppy, fish with bladed bait or prop bait. If its calm stick with a pencil type that "walks the dog" or a popper bait that doesnt have too bad of a coned mouth so it spits the water more like a naturally injured minnow.
I've caught bass on topwater just after ice off, yes water in the 40's. All depends on the conditions, what you are using and most importantly how you are using it. Cant expect the same lure to work year round while fishing it the same way. Generally speaking Bass wont start hitting topwater with consistency until water temps get 60+.
I'd buy several different kinds and colors. Fall is about the best time of year for topwater (consistently). In another couple of weeks the Bass will be feeding heavy on Shad/Minnows and a topwater lure is just the ticket. A 1/2 oz Shad/trout colored buzzbait or LC Gunfish would be top choices at Powell or any of the lakes.
Feel free to pm me with any questions or if you want pics of different kinds, be happy to help [
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