There are 2 cross-state (WA) rides that I know of: one is a race, the other a fund-raising supported tour for a local Rotary club.
I've heard of the Cannonball race (Sea>Spokane) from some riders - women - who've done it. 275 miles and riders arrange for their own support. It's mainly on the I-90 shoulder, so that doesn't hold much interest with me, but to each her own, eh?!
The other is Red-Spoke from Redmond>Spokane over 5 days on scenic back roads mostly.

11.5 - yep, the great Northwest IS a great place to live and ride and us girls who ride love it! There are tons of roads, trails and great rides for every level and interest in a huge area that offers an amazing variety of scenery that is jaw-dropping in it's beauty.