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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True Bug Family Nepidae (Water Scorpions)
Where & when
In 537 records from GBIF, adults of this family have mostly been collected during July (14%), June (13%), September (13%), August (12%), October (11%), April (10%), May (9%), March (6%), and November (6%).
In 18 records from GBIF, this family has been collected at elevations ranging from 59 to 5971 ft, with an average (median) of 777 ft.
Family Range
Specimens of Water Scorpions:
1 Adult
Here's a big water scorpion (no relation to actual scorpions). These guys are just about the most sinister-looking creatures you could find, and what's especially creepy is that they can come up out of the water and fly around, as I learned when one left my aquarium and buzzed my head while I was peeking into the microscope at a mayfly nymph.