I would add, There are a lot of NF camp grounds in the Twisp, and Winthrop area plus if you like you can follow 97 north to catch #20 at Okanogan it is a bit of twisty road for a few miles but nothing dangerous. and at the top of the Loup Loup Pass the Best National forest camp is about 1/4 mile off the highway. Its well marked.
After you exit out of the Methow Valley, your next camp is Colonial Creek camp on Diablo Lake. (thats on the west side) there is 87 miles between Winthrop and Concrete where there are no services -- that's nothing at all. -- nada -- zip.
After Concrete your back in civilization. ( I-5 Corridor actually) # 20 brings you on to the San Juan Is. and will bring you thru home town. :) honk when you pass the house :
