You're not alone in your sightings. My brother saw a wild turkey along I-90 closer to North Bend a few weeks ago.

On the Eastside of the mountains, there are healthy populations of Rio Grande and Miriams turkeys. I've heard they've reintroduced some in the Central WA area, specifically right outside of Ellensburg, but have yet to hear of any sightings.
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"If fishing is like religion, then flyfishing is high church." -Tom Brokaw