Snoqualmie river bugs 6/16/13

#1
I was pretty far up the river yesterday (elev. ~2300) and spotted a bunch of insect activity. Yellow Sallies, size 14 tan caddis, and what I think were PEDs were out and about. I also found a few of these guys:
2013-06-16 12.48.26.jpg


I also spotted a couple dozen large mayflies, maybe size 8-10, brown color with 2 tails (or a very small middle tail not visible from 3 feet) each split 45 degrees off midline. The tails were about 1.5-2x the length of the body. They were flittering 6-15 feet above the stream, never landing on anything and always remaining out of reach. I started noticing them about 6:30 and the hatch increased until we left around 7:30. Any guess on what they could have been?
 

Taxon

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#2
Hi Gary-

First the stonefly, which I have cropped so it can be better identified:



Now, as to the mayflies you described. Did they look like this?

 

Taxon

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Staff member
#4
Hi Gary-

Well, the photo I provided was of an Amemetus male imago, which has a common name of Brown Dun, and based on your description of the mayflies, their behavior, and the elevation at which you observed them, would be my guess.