Elk Hair Caddis. If I had only one dry fly to fish, this is it. The Elk Hair Caddis offers it all-superb flotation, excellent visibility, and good durability. It's deadly during a caddis hatch, but produces equally well when fished as a searching pattern. Though the fly is ordinarily fished dead-drift, the abundance of hackle allows you to skate or skitter this pattern across the surface, which can trigger some jolting strikes. The bushy, buoyant wing makes it a natural for fast or broken water; on flatter water, you can trim the hackle flush with the bottom of the body to put the fly right on the surface. You can also trim the wing back to one-third the original length and fish this fly as an emerger pattern.