I keyed this one out using the Alberta species key from Zloty & Pritchard 1997.
Notes from the ID include:
1. Posterior margin of sternites 6-8 without spines
2. Mesal gill extension "well developed"
3. Basil third of caudal filaments pale
4. Anterior surface of front femora mostly pale
5. Dark band on caudal filaments begins around segment 20
6. Final instars early season
This one keys out pretty cleanly to Ameletus vernalis except the color pattern on the tergites doesn't match. However, two species known in Washington aren't included in the key. Of those two, Ameletus vancouverensis would be too small (adult body length 9 mm), but Ameletus andersoni (currently documented only from a spring in Cowlitz County) has a wide range of sizes and emergence times that could be compatible with this one. So I can't rule that species out, but Ameletus vernalis seems the most likely.