Our State Parks system has excellent CGs, on both sides of the Cascades. There are also some excellent city and county ones, too. This is a big state and the desert eastern side is a lot different to the side we live on.
If you'd like info on CGs west of the mountains and from Everett north to the border, I can help if you give more info. In Eastern WA, I know a few good ones based on personal experience. Send me a PM with more details of your trip route and I'll help if I can.
Frank Damp -Anacortes, WA,(DW- Eileen)
ex-pat Brits (1968) and now ex-RVers, as of 08 Dec 14.