Thanks for the info. I returned from my trip earlier this week. I wound up making 2 rides out of Hunters while there.
I rode north on hwy 25 to Cedonia-Addy rd, Blue Creek rd, hwy 395 through Chewelah to hwy 231 through Valley and back via Hunters-Springdale rd. This was around 80 miles, with good to excellent road surfaces and shoulders.
I also road an out-and-back south on hwy 25 to Fort Spokane at 2-Rivers. This was 40 miles round trip with good road surfaces and shoulders. There's more traffic on hwy 25 than on the county roads, but the shoulder is a couple feet wide allowing for some room.
I ran into some locals riders while there who discouraged me from riding through Welpinit due to traffic on hwy 231 between Ford and Springdale.
Oh, and I also saw some BIG turkeys on Cedonia-Addy road