I'm going to be riding from Clarkston to Spokane next month as part of a longer tour also. I plan on taking 193 out of Clarkston up the Snake River to Wawawai Grade Rd and into Pullman. Then I'll follow hwy 27 into Spokane. I've ridden on 27 between Pullman and Oakesdale and it's a good road with less traffic than 195.