State Route SR14 WA up the Gorge:
https://www.flickr.com/photos/kenhattan/sets/72157631978536727/
Giggord Pinchot Nat. Forest on Wind River Rd., Meadow Creek Rd., FR 90-FR23, to Trout Lake-Glenwood Hwy, BZ-Glenwood Hwy :
https://www.flickr.com/photos/kenhattan/sets/72157610455610122/
And if you have time this isn't in WA but is really great for Fall riding: Multi day fall ride, that I call the Perfect Fall Ride through Oregon to the coast and Northern California to Crater Lake: Wolf Creek Rd.-Smith River Rd. to Reedsport, 101 South to Arcata, 299 to Redding, 36 & 89 to Quincy, 89 to 49 on Gold Lake Rd., 49 to Nevada City, Williams to Hopland on 20, 53, 29 and 175, Stewarts Point Skaggs Springs Rd. to the Coast, Hwy 1 to Leggett, 101 to Fortuna, 36 to Hayfork, 3 to Fort Jones, Scott River Rd to Steelhead/Hwy 96, 96 to I-5. Or 62 to Crater Lake, Rim Drive, 232 to 138 to Glide, Co. Rd. 200 to Wilbur.
https://home.comcast.net/~kenhattan/site/?/blog/view/3/,
https://www.flickr.com/photos/kenhattan/sets/72157608500865885/