Check the river gauges and fish whatever rivers are not on the rise. If dropping you will do well, but if raising it will suck, honestly.
You will do good on the Nisqually and the Cowlitz, both can handle the weather very well. The Nisqually fishes well on the rise actually. I would consider fishing it a night though, its awfully crowded during the day lately, but get their during the day, so you know where tho good area is, so you can get it at night.