I love fishing flies but it seems that most of the time it requires a nymph pattern of some sort. I was first taught the "hopper/dropper" on the nearby Slate and that is a hard combo to beat. Mind you the hopper does not have to be a hopper pattern, but the parachute Adams works well dragging a bead head pheasant tail around these parts most of the time.
When they are hitting the top, Caddis or Royal Wulff always gets action, go small though.
