I avoid gin clear water such as the pool pictured. If I can see a fish the fish has probably seen me first. All hope and confidence is lost, at least for me.

I like to fish the fast water (riffles) where the fish are well oxygenated and at least have a broken surface for cover. I feel the fish react more quickly to a well swung fly (such as a string leech) traveling past their nose. A lot of places up high on the Nooch with great summer water!