The river from Ashton Dam downstream is in the “summer doldrums” now. Go elsewhere unless you try at sunrise or sunset with streamers. The big mayfly hatches are pretty much over in the Pinehaven-Harriman-Last Chance section (except for a few places where springs enter the river) until speckled duns and trico emergences become important. Your best chances here are with terrestrial patterns. Patterns tied with traditional materials tend to have a more delicate imprint on the surface than those tied with foam or rubber. Thus, be a bit careful when choosing hopper patterns if you will be fishing slower waters. In sections with faster water and a more broken surface, such as in Cardiac Canyon or around Riverside Campground, this difference is not as significant.