Make sure you take the water temps - I imagine it'll be cooling off over the next two weeks or so though. Not sure what the stocking schedule is either for it, but if it hasn't received a fall stocking it might be a little sparse fish-wise.
I've had better luck below the falls - above the falls there is good water too but a little harder to access in some spots although there are trails that run a good length of it.
There is a trail access map at the parking lot by the falls that will show you which trails to take to access the stream both above and below. Below the falls there are some trails through the boy scout camp that make access too some pools pretty easy.