Henry’s Fork, July 27th, 2024

Summer doldrums are impacting the lower river, while cooler AMs and thunder shower potential help in keeping fishing success reasonable on the upper river. Also helping are growing stream side terrestrial insect populations (especially ants!). Algae is beginning to show in Island Park Reservoir and could impact water quality in the out flow. Water temps are generally such that dissolved oxygen concentrations are above the five mg per liter stress level for trout. Nevertheless consider minimizing fishing after three or four PM because this threshold could be approached and recovery of a caught and played trout impacted.