When the road is washed in places, that makes it impassable for most vehicles but with bike, you can walk it or shoulder it and make few hundred feet detour through the surrounding countryside to bypass the washed out section(s).
Problem might be, this being CA, you might be prevented doing that for various reasons. In Europe where I live and bike, there was a bridge under repair for a good part of the year and on my rides, I needed to cross that bridge and did so on several occasions (after work hours but even with some workers present, they would just look and let me go past them) until the construction took a more serious turn and it was not passable at all. But if that was not a bridge but a road, on bike or on foot you stand good chance bypassing the place.