Henrys Fork of the Snake River, Box Canyon to Riverside

Water cleared significantly after morning thunderstorms, with overcast skies keeping fish less wary through the afternoon. Flows sat at 674 cfs at Island Park gauge, down from 800 cfs two weeks prior, tightening seams and opening up wade access across the flatwater. Terrestrials dominated the dry-fly menu—ants and beetles from mid-morning through late afternoon—with grasshoppers picking up around midday. Consider nymphing deep in Box Canyon right after storms clear, then shift to the Railroad Ranch flatwater for dry-fly work once conditions improve.