Eastern WA? there are a ton of lakes just over any of the passes. Ellensburg has several right next to I-90. Stocked with nice trout maybe some tripoloids? HWY 2, try fish Lake about 15 miles before Leavenworth. Resort owner plants some big trout in it. You could spend a week just fishing lakes around Ellensburg/George/Moses Lake/Pot Holes/Seep Lakes/Sun Lks.
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God grant me the serenity to accept the size of fish I catch, the courage not to lie about it, and the wisdom to know that no one would believe me anyways.