I'd go all the way south on 97 to Goldendale, then decide if you want to go west on 84 to Portland, then south on I-5, or continue south on 97 to Weed, then connect to I-5.
I would also take 205 south from 84 just east of Portland and hit I-5 south of Portland.
And I would consider a detour at Wenatchee to miss Blewett Pass. I would go south from Wenatachee to Quincey, then south to I-90, then either south through Mattawa to Tri-Cites or continue west on I-90 to Ellensburg and then go south on 97 to Goldendale.
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