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.
CharlieSawd on Feb 26, 2009February 26th, 2009, 8:39 am EST
I think it is Oncorhynchus clarki lewisi, the westslope cutthroat. Bonni's tend to have more of a yellow hue. There are resident westslopes in north western WY, and as you said you were fishing a high mountain lake, my guess is you were in this region.