Michael... a little closer to home is Central Oregon. Late May/Early June offers a number of excellent options. In late May, the irrigators start taking water out of the Deschutes River, which actually opens up wading opportunities in a number of sections around Bend, Redmond, Tumalo, Or that flow too swiftly in the winter. These areas are referred to as the Middle Deschutes. There are good populations of wild rainbows, browns, and whitefish in these sections.
On May 22, the upper stretches of there Metolius opens. If you've not fished here, its a beautiful river and also has wild Redside trout and Bull Trout, and the occasional brown.and whitefish. Miles of wadable river to fish.
Also is the Lower Deschutes from Warm Springs Reservation to the Columbia. Miles of big river fishing.
And the Crooked River. renown for a Mother's Day Caddis hatch that will keep you busy for days.
If you need guides, Fin and Fire Flyshop in Redmond is top notch and I know all of those guys well. And of course you can get free guiding from me, not professional guiding, but I fish one or two days a week year round on these waters.
All of these locations are within one hour of Bend or Redmon, Or...and did I mention the 20+ craft breweries and distilleries....and the 20+ golf courses.
just sayin.... not too far from Seattle...