This specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.
Retired ordnance manufacturing manager. Fly fishing and fly tying is how I prefer to spend my leisure time. FF primarily in NY, PA, and MT trout, steelhead, and smallmouth bass.