This Skwala nymph still has a couple months left to go before hatching, but it's still a good representative of its species, which was extremely abundant in my sample for a stonefly of this size. It's obvious why the Yakima is known for its Skwala hatch.
On the way to my first elk hunt in Wyoming, I planned a morning stopover along the Henry's Fork of the Snake. I figured there wouldn't be much hatch activity, and I wanted to try something new anyway, so I skipped the famous Harriman Ranch section where I normally fish (and collect bugs), and I explored some new water farther downstream, in a place that took some hiking to reach. I brought rods to fish streamers and nymphs, and both were effective.