The Fall River overall is fishing well, but it is getting a lot of angling pressure from 9 to 2, so keep in mind there are a lot of options to combat that. Spread out. Not everyone needs to go to the Hatchery or the Campground. Go earlier in the morning. Go later and stay to dark. All of these will make your experience nicer. 
PMD and BWO’s are the main 2 mayflies, fish all stages there: nymphs, emergers, cripples, duns and spinners. Olive Caddis #16-18, Tan Caddis #16, Hot Orange Missing Link, Yellow Sally, Ant, Black Beetle, Hippie Stomper, Grasshoppers, Perdigons, Micro Streamers, Eggs & Zebra Midges.