Blue-winged Olives
Baetis
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.
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This species was fairly abundant in a February sample of the upper Yakima.
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I collected this one by sweeping through leaves in vegetation near the stream, and I kept it thinking (in the fading light) that it might be one of the tiniest caddisflies. It is not.
Creno on Aug 7, 2019August 7th, 2019, 4:23 pm EDT
I checked with Boris Kondratieff and it would take fresh specimens in hand to make a further determination for this difficult group.