For the River below Ashton Dam strategies used on the South Fork apply quite well. This time of year the big attractions are the BWO activity and streamers during low light conditions. One difference: you will see more tiny blue winged olives (pseudocloeon) here than on the South Fork. With the change of weather for the worst coming up, both BWO (and tiny blue wing olive) life cycle patterns and streamer patterns should be the ticket for the best fishing here. Flows out of Island Park Dam are just above 200 cfs making wading the Box Canyon a great choice. Streamers can bring out those big fish, and a double nymph rig drifted through runs and holes can produce.