Hope you had a great ride. We avoided that road on the Concours and took a v strom 650 because of the potholes. Some evil hidden holes in the tree shadow that bottomed out the suspension. I think it was doable on the Concours but with caution not to mention random gravel sections.
The roads in Sonoma Mendocino and Humbolt counties get a pounding from winter storms and can quickly degenerate to a ww1 battlefield. These counties have some of the worlds best riding for sure.