only one way to know....take everything you have and try until something works, start with the basics, see what the water conditions are, time of day etc, and addapt to it, are you fishing from the bank or boat?
I would use what always works for me in, ZOOM Horney toad in junebug, you can fish it in any condition and almost anywhere, on top or inside at any depth, always with a floro carbon leader
Its a real small dam with alot of bass anglers. Really high presure on the water, we caught the most with really small lures, and in places we dont necessarily fish. Most of them were small just one over a kg. Crankbaits is difficult due to all the water grass. Must admit there is nice trophy bass in the dam they just very clever!
Sorry for the late reply, I would use a spinnerbait in any natural green colour as there was a guy in a past issue of the tight lines magazine who caught a 5.3kg bass on one.