Some of the best fishing on the river can be experienced on the Harriman reach where callibaetis and trico mayflies provide action. Terrestrial patterns including hopper and ant patterns are a must, and the South Fork strategy of trailing your favorite hopper with a cinnamon ant pattern (#14) is sure to produce. As with many meadow reaches the Harriman section also hosts deer flies and horseflies. Don’t overlook this presence, and consider that a standard humpy, size 16-12 can imitate these pests. After you swat those pests, drop ’em in the river, then listen for a downstream rise. That is proof fish will take them!
If you fish from Riverside to Warm River use those terrestrial and caddis patterns, but also include traditional attractors. Below the Warm River confluence fishing gets tough as the water now at base level has warmed going through the canyons. Best strategy for the lower river is to wait for the cooler days coming soon. Then look for a great revival of fish activity.