Given that I drove part of the abandoned portion of the pre-1961 alignment of CA 190 east of Lake Success I had to take Signed County Route J28. There ins't any signage on J28 anymore but I noticed it partially is postmiled as part of Mountain Route 176. I ended up taking the entire route between CA 190 and CA 65:
https://flic.kr/s/aHskGiynX3
Edit: Below is the blog post, I didn't want to bump this over stuff that is more important like the I-5W thread or CA 190:
http://surewhynotnow.blogspot.com/2018/08/signed-county-route-j28.html