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 one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.
Ugly flies catch fish, pretty flies catch fisherman and well tied flies catch both.
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Oh, thrilling the rise to the lure that is dry, when the shy fish comes up to his slaughter.
Yet rather would I have the turn to my fly. with a cunning brown wink under water.
The bright little wink under water! Mysterious wink under water!
Delightful