Stan, I'm located in NE Mo, far from the area you want to visit but I can tell you that no fall color has started here and won't for about 2 weeks or longer. Fall colors in AR should be best the last week of Oct or first week of Nov.
The drought in my area has been extreme and Isaac brought 2 inches of rain for myself and as much as 5 inches in nearby areas, it has made the grass green again but there was absolutely no run off. I've seen many thunderstorms pass South of here near the Mo/AR border so hopefully you will find more pleasant conditions in that area on your way through.
If someone is not of more help soon, I can make a phone call and perhaps find out what water levels are doing in the Ozarks. Have a pleasant and safe trip back home.