That'd be CA36.
If you're heading north, I can't recommend the Butler NorCal Map highly enough. I've lived here for nearly 25 years and it still shows me roads I've never ridden.
A classic loop is the 36>3>299 loop out of Eureka. It's a full day with everything from goat trails to perfect and endless sweepers all day long.
https://butlermaps.com/motorcycle-ro...alifornia-map/
They make these for a bunch of states and the roads they point you toward are absolutely outstanding. These aren't like Mad Maps, which seem to be directed to the "roadhouse tour" gang, but to folks like us that want to see cool stuff and ride cool roads.