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 specimen keys to the Epeorus albertae group of species. Of the five species in that group, the two known in Washington state are Epeorus albertae and Epeorus dulciana. Of the two, albertae has been collected in vastly more locations in Washington than dulciana, suggesting it is far more common. On that basis alone I'm tentatively putting this nymph in albertae, with the large caveat that there's no real information to rule out dulciana.
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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.