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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
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.

Dorsal view of a Ephemerella mucronata (Ephemerellidae) Mayfly Nymph from the Yakima River in Washington
This is an interesting one. Following the keys in Merritt R.W., Cummins, K.W., and Berg, M.B. (2019) and Jacobus et al. (2014), it keys clearly to Ephemerella. Jacobus et al provide a key to species, but some of the characteristics are tricky to interpret without illustrations. If I didn't make any mistakes, this one keys to Ephemerella mucronata, which has not previously been reported any closer to here than Montana and Alberta. The main character seems to fit well: "Abdominal terga with prominent, paired, subparallel, spiculate ridges." Several illustrations or descriptions of this holarctic species from the US and Europe seem to match, including the body length, tarsal claws and denticles, labial palp, and gill shapes. These sources include including Richard Allen's original description of this species in North America under the now-defunct name E. moffatae in Allen RK (1977) and the figures in this description of the species in Italy.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Landscape & scenery photos from Clearwater Mountains

Standing atop the pass checking out the route down.

From Clearwater Mountains in Alaska
Upper Sout Fork Pass Creek valley

From Clearwater Mountains in Alaska
Frigid shooting star (Dodecatheon frigidum)

From Clearwater Mountains in Alaska
Creek flowing out of the first pass we climbed.

From Clearwater Mountains in Alaska
Clouds spilling over the mountaintops

From Clearwater Mountains in Alaska
Moss campion (Silene acaulis)

From Clearwater Mountains in Alaska
Pass at the top of Alpine Creek (panorama). This detailed 360 degree panorama is best viewed full-size.

From Clearwater Mountains in Alaska
Big mountain to the south

From Clearwater Mountains in Alaska
Valeriana capitata

From Clearwater Mountains in Alaska
Rainbow mini-panorama.

From Clearwater Mountains in Alaska
Sunbeam streaming through Wedding Pass.

From Clearwater Mountains in Alaska
Brush to cross in Windy Creek valley

From Clearwater Mountains in Alaska
Pretty alpine meadow

From Clearwater Mountains in Alaska
Saxifrage of some sort. Maybe yellow-spotted saxifrage (Sagifraga bronchialis) but it could be some other species of Saxifraga.

From Clearwater Mountains in Alaska
Clearwater Mountains in Alaska
Clearwater Mountains in Alaska
Clearwater Mountains in Alaska
Clearwater Mountains in Alaska

References

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