I-80 don't go to WA. From Eastern WA it's about the same to go via Salt Lake and Vegas, but from Western WA I-5 does the trick.
I HATE I-5 with a passion! i usually cross the columbia at the eastern side right under the Tri-Cities and cut down thru central Oregon and go thru Klamoth Falls.
it quicker for me and cuts out all the nonsense.