After completing CA 135 I took a short cut to Sisquoc where former CA 176 would have ended east of Santa Maria. Usually I have a look at the GSV if I'm not familiar with a road but I didn't for some reason when I scouted out Cat Canyon Road. Pretty much the road was normal until I hit a huge down hill/single lane grade. Apparently Cat Canyon road was a well maintained county level road even back in the 1930s as it appears on Division of Highways map. Anyways, I thought it was pretty cool so I took so pictures and I'll try to find out the history later this week:
https://flic.kr/s/aHskvM1aEk
The earliest map reference for Cat Canyon Road I could find was back in 1935. Given the oil field of the same name dates back to 1908 I would imagine it was present much earlier given the somewhat haphazard design of the downhill grade has a early 20th century haul road feel to it.
http://surewhynotnow.blogspot.com/2018/04/cat-canyon-road.html