I know Indyfabz has some knowledge here. You've given some good tips in the past on here. Do you have any suggestions?
Can't help you in WA, but I am planning on being on parts of the NT in MT this June, and I have been trying to incorporate more dirt in my trips. One thing I have been considering to avoid some of U.S. 93 south of Eureka is this:https://ridewithgps.com/routes/20375773
Don't have any experience, but from the profile you can see that there is a short, nasty section with a ruling grade above 15%. It puts you back on U.S. 93 just north of Olney, so you don't miss the town store juts off route.
And are you aware that the official route takes a break from U.S. 93 just south of Lupfer? It uses Farm to Market Rd. and Twin Bridges Rd. west of U.S. 93. Very nice back there.
When did you take NF-228/92? I was under the impression that it was paved, at least now it is?