Hex Mayflies
Hexagenia limbata
The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.
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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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Dobsonflies
Dobsonflies and their predatory larvae, the hellgrammites, are among the largest trout stream insects. They are best known as a good excuse for the rigid imitationist to fish a wooly bugger.
Like most common names,"Dobsonfly" can refer to more than one taxon. They're previewed below, along with 1 specimen. For more detail click through to the scientific names.
Hellgrammite Genus Corydalus
These are pretty much always called Dobsonflies.
The largest and most well-known hellgrammites belong to this genus, although in my collecting experiences the fishflies of Nigronia seem to be more common in trout streams.
Hellgrammite Species Corydalus cornutus
These are very rarely called Dobsonflies.