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 pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.
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Stonefly Genus Mesocapnia (Little Snowflies)
Taxonomy
Species in Mesocapnia
Mesocapnia variabilisVariable Snowflies
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Species in Mesocapnia: Mesocapnia variabilis
14 species (Mesocapnia arizonensis, Mesocapnia autumna, Mesocapnia bakeri, Mesocapnia bergi, Mesocapnia bulbosa, Mesocapnia frisoni, Mesocapnia lapwae, Mesocapnia oenone, Mesocapnia ogotoruka, Mesocapnia porrecta, Mesocapnia projecta, Mesocapnia sugluka, Mesocapnia werneri, and Mesocapnia yoloensis) aren't included.