Fish get educated real quick in small bodies of water like that. Lighter line, finesse type baits, or just a bait that they haven't seen yet sometimes work. We've got a lot of ponds that hold lots of fish, but won't bite a thing.
I'm thinking thats what most likely has happened. I've seen others fishing on it at the sime time i have and so I assume the bass have seen a lot of different types of lures over time. Might have to try something completely different and out of the ordinary, maybe a rooster or something.