Photo by Don Douple
Sulphurs duns will appear about 8 pm.
Around 8:30 pm, look for ephemerrella rotunda spinners over the riffles, there can be millions!
Wait for the fish to start feeding on the spinners then fish the feeding lanes below the riffles.
Have Pale Evening or Compara Dun patterns in size 16.
In the morning many anglers observe paraleptophlebia mollis and mistake them for tricos.
My experience indicates p. mollis are unimportant to the angler.
In the daytime successful flies will be Midge patterns like Al's Rats and Griffith Gnats, Sulphur Nymphs, Ants, Craneflies, and Pheasant Tails.
In the evening , Pale Evening Duns and Sulphur Compara Duns are productive.
Late June can bring the first tricos. When these are blooming, you know Sulphurs are over.