Fish in the lower river are in a “kids in a candy store” situation. Flavs, PMDs, gray drakes, midges, caddis, sallys, and a few left over golden stones are all active. All you have to figure is which are they taking at a given time and location. Afternoons into evenings are best. Don’t worry so much about fly pattern for each of these, put more attention onto presentation. Look for the flavs and gray drakes to begin decreasing in numbers soon and the consider that such as beetles and ants will become important. On the upper river the big news is the evening brown drake emergence on lower Harriman, but look for the flavs to become important too. It’s a great time to be on the Henry’s Fork!