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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Dark Olive Brown Spinners
Like most common names,"Dark Olive Brown Spinner" can refer to more than one taxon. They're previewed below, along with 1 specimen. For more detail click through to the scientific names.
Mayfly Species Baetis flavistriga
These are very rarely called Dark Olive Brown Spinners.
This is one of the most widespread and abundant Baetis species, and it may produce fishable hatches under a variety of conditions.
This species is known in angling books by several old synonyms, including Baetis quebecensus, Baetis levitans, Baetis cingulatus, and Baetis phoebus, in addition to the correct name.
This species is known in angling books by several old synonyms, including Baetis quebecensus, Baetis levitans, Baetis cingulatus, and Baetis phoebus, in addition to the correct name.
This nymph keys to Baetis assuming the villipore is present (hard to see in my photos or scope), and within that genus it tentatively keys to the flavistriga species complex, of which Baetis flavistriga itself is by far the most common in Washington state, so that's the most likely ID.
See 2 more specimens...
Mayfly Species Dannella simplex
These are very rarely called Dark Olive Brown Spinners.
Although by no means a superhatch, this species can be important. Authors who discuss it lament the general lack of credit it receives for the fine hatches it produces on some streams.