The Fall River is really good fishing, especially with little streamers right now. Eggs, Rainbow Warriors, Purple Perdigons, Zebra Midges, Tan Caddis Pupa and Red Copper Johns have been best. 
Blue Wing Olive hatches are getting better and better and PMD hatches remain important and might be hatching (remember the recent masking hatch post) at the same time. These fish get choosey, so you need 6x, 6.5x or 7x and cripples (KD Dun) and Emergers (Captive Dun, Film Critic, Winger, Sparkle Dun) for both. 
Midges, Caddis and Terrestrials round out what the fish are likely to eat on the dry fly side. 3 Flies I would not be w/o on the Fall would be a black ant, a hi-viz griffiths gnat and a missing link caddis. Okay, okay, 4 flies. A tan cdc caddis in a #16 needs to be added. Three. Four. What the heck? You want to fool fish on good flies, tie on one more.