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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

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.

Lateral view of a Female Sweltsa borealis (Chloroperlidae) (Boreal Sallfly) Stonefly Adult from Harris Creek in Washington
I was not fishing, but happened to be at an unrelated social event on a hill above this tiny creek (which I never even saw) when this stonefly flew by me. I assume it came from there. Some key characteristics are tricky to follow, but process of elimination ultimately led me to Sweltsa borealis. It is reassuringly similar to this specimen posted by Bob Newell years ago. It is also so strikingly similar to this nymph from the same river system that I'm comfortable identifying that nymph from this adult. I was especially pleased with the closeup photo of four mites parasitizing this one.
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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Quick evening trip to the South Fork Snoqualmie

Quick evening trip to the South Fork Snoqualmie

By Troutnut on July 19th, 2019
My wife and I drove up to the nearest trout stream for some quick evening fishing. I hoped to put her on some fish in the pools that allowed easier casting, but they seemed oddly devoid of fish. The ones I caught were rising sporadically, tight against cover that would snag most flies and required precise presentation. Retention is allowed on this stream, so I think maybe the easy pools got fished out.

Little green stoneflies (likely Alloperla) were common in the air in this fast-water reach, and I saw several on the water too.

Photos by Troutnut from the South Fork Snoqualmie River in Washington

The South Fork Snoqualmie River in Washington
Pretty little coastal cutthroat from the South Fork.

Closeup insects by Troutnut from the South Fork Snoqualmie River in Washington

Lateral view of a Male Calineuria californica (Perlidae) (Golden Stone) Stonefly Adult from the South Fork Snoqualmie River in Washington
A few of these larger stoneflies were fluttering around the South Fork on an evening dominated by much smaller species.

This one has been difficult to identify. I can't spot any of the gill remnants characteristic of Perlidae, but the wing venation seems to point in that direction. I tried keying it out as Perlodidae but arrived at Isoperla, every western species of which has significantly smaller bodies than this one.

Edit: See forum comments for a likely correct identification.

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