The fishing at the Fall River is much better than average, and we’ve had good guide days from the Headwaters to the Camp Ground, and near the Hatchery. I also like the Tubes/Falls area and access there provides a lot of cool water with some favorite spots to fish. 
BWO hatches are taking off for fall, so make sure to have KD Duns, Knock Down Duns, Sparkle Duns, Purple Comparaduns and Film Critics for these Baetis in a #18-20. 
Fish these with 6x and 7x tippets. It makes a difference…. the smaller you go, the more fish will eat your fly. 
There are also PMD’s in a #16 mixed in, and Amber Caddis #14-16, Midges #22 and a lot of opportunities for Beetles, Ants and Hoppers with the warm weather. 
Streamer fishing is great! Nymphing is also highly productive and we prefer to Euro Nymph the Fall River. I heard a tip from someone I trust that have been having good luck with a Red Chubby and running a nymph 2 to 3 feet off the bend of the hook for their dry/dropper rig. They said about a quarter of the fish crush the dry. Hmmmmmm. I like this. I won’t be there until October 8th, but I will try it then.