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.
I've lived in Washington for three years and not yet caught a steelhead, or even really tried, in the famed rivers of the Olympic Peninsula. My wife and I had a brief window to get away for about a day and a half and did some exploring over there this week. However, with the short days, beach time, and rambunctious new puppy, I didn't get much serious fishing done. I fished some promising water on the Hoh for about an hour, seeing no fish but talking to others who had, and I spent all of about ten minutes swinging a fly through a run on the Sol Duc. I'd love to get back there for a few days of serious fishing when time allows.