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 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.
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Little Grannoms
This common name refers to only one genus. Click its scientific name to learn more.
Caddisfly Genus Micrasema
These are often called Little Grannoms.
I have only seen two species of this small genus mentioned in angling books, and neither was said to be anything special.