The Yak is a blue ribbon stream, and there are a number of other opportunities like Lake Lenore that offer unique opportunities for trophy fish.
The Deschutes is a great option too, both summer run steelhead and redsides around.
There are numerous rivers around to try, each a jewel in it's own right. There are literally rivers everywhere and all beautiful clear glacial flows with plenty of fish.
But my mouth waters for steelhead and salmon - and there will be plenty around that time of year. That might be an alternative to chasing trout?