Re: Big South Fork?
Rock Creek is a good stream.
By October the water will be low but don't let that stop you from fishing. I've had some great fishing there in the fall.
There is a road (on the KY side) running along this creek for much of its length that gives you access to some good water. Hit the holes, there are some very large ones that seem to hold fish all year.
The fish seem to like small stonefly nymphs and bead head patterns like, pheasant tail, prince,and hare's ears. Don't forget light and dark woolly buggers. The drys I use are on the small side and are usually yellow stimulators, EH caddis and para adams.