Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
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.
Described by Frison, T.H. (1942) Studies of North American Plecoptera, With Special Reference to the Fauna of Illinois. Illinois Natural History Survey Bulletin 22, 235–355.