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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 Setvena wahkeena (Perlodidae) (Wahkeena Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
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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Photos by Troutnut from the East Fork of the Iron River, , and Schacte Creek in Wisconsin and

Two dear make tracks across a frozen trout stream in the deep snows of early February not far from Lake Superior.  I had hoped to sample nymphs in the stream (which later turned out to be quite fertile) but it wasn't open.

From the East Fork of the Iron River in Wisconsin
Here's another of my very frigid early nymph sampling sites.
This tiny spring creek is extremely fertile, and I sampled many interesting insects I didn't find anywhere else.  The water was completely open even though other nearby spring creeks were frozen over and the snow was three feet deep.

From Schacte Creek in Wisconsin
I had hoped to sample some nymphs here, but I didn't bring an ice auger.

Closeup insects by Troutnut from Miscellaneous Wisconsin, the Bois Brule River, the Namekagon River, Schacte Creek, and Schacte Creek in Wisconsin

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