Fishing hoppers is alot like fishing streamers. You are not always going to get instantaneous gratification but if you stick it out you will eventually be rewarded. Hopper fishing is often a game of inches. Give or take a couple inches and you may not find what you are looking for.
We are currently experiencing a cool down in the weather and the water. As the water temps drop a bit and the nights remain cool the bigger fish tend to make their way out of summer hibernation to feed again. Warmer September afternoons are a great time to find them with a large terrestrial / hopper pattern.
Some of our fall aquatic insects are starting to show up as well. October caddis, hecubas (fall drake), and mohogany duns are showing up and will appear in better numbers with cooler weather. A large brown or purple Quigly style cripple in a #8 or #10 is a great search bug for fall fishing success.
Here are some recent dry fly fish from the last couple weeks. The next few weeks should provide more great dry fly angling.