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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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> The South Fork Stillaguamish River

Landscape & scenery photos from the South Fork Stillaguamish River

Closeup insects by Troutnut from the South Fork Stillaguamish River in Washington

Male Cinygmula (Dark Red Quills) Mayfly Spinner
I'm unsure of the ID on this one; keys put it closest to Cinygmula reticulata, but I'm very doubtful of the species and not positive on the genus. Epeorus is another possibility, but I don't know which species it would be.

This one was collected in association with a female dun probably of a different family.
Female Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Dun
This one was collected in association with a male spinner, but they appear to be different families.
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