The Fall River is also seeing a fair number of mosquitos near the Tubes and Falls, but not too bad at the Hatchery or the Camp Ground. PMD’s and Midges and Olive Caddis are probably your top 3 hatch dry fly choices, and Ants and Beetles at times may end being your #1 choices for dries. 
The best fishing is coming on little streamers like a Mini Gulp, Soccer Mom and other Leech or Sculpin type streamers and with tungsten nymphs like an Egg, Zebra Midge, Perdigon, Dark Walts, 2 Bit Hooker and Micro Mayfly to match BWO and PMD nymphs so Olive #18-20 and Brown #16.