Low water time of the year. Look for releases or aquifer fed runs. Wyoming, Montana, Idaho, Washington and Oregon all have runs going in the grade you are looking for. I'd suggest just linking them all up. If you can afford to drive to PNW you can afford to stop along the way and get more runs in.
Not much will be prime but these should all be runnable and this would be a rough order heading out:
Snake, Grey's, Gallatin, Beartrap of the Madison, Alberton Gorge of the Clark Fork, South Payette, Main Payette, Farmlands on the White Salmon, Middle White Salmon, Green Truss (maybe too hard or maybe right with low levels and portages), Deschutes.
The sunshine walked beside her