Hi tkww-
Yes, I believe this male imago to be Ameletus vernalis. Which SE WA county is it from?
BINGOWalla Walla. Saw the first one a couple week ago when we had a brief temperature bump, and a sparse few over the last couple of weeks.
Hi (tkww and Tom Butler)-
Please post your (above) excellent images to BugGuide ID Request so I can identify & move them to their proper placement in the guide.
I got mine loaded as well. Thanks for your expertise @Taxon .Done. Let me know if it doesn't show up.