Many times when aske da question about records access–whether the records are available, what records were maintained, how are records accessed, are they still extant, etc. –the answer depends on the specific location. No one can be knowledgeable about all areas and time periods. Someone with general California knowledge can provide broad ideas about what records are available for Colusa County, California, but the best answer will be given by someone who has specific knowledge about that location.
There may be localized genealogy groups on Facebook where these questions can be asked (but keep in mind that not everyone who says they “know their stuff” actually does). One may also reach out to local historical or genealogical societies, local libraries, or even the local courthouse–to see if they know, or if they don’t, if they can point you in the direction of someone who does.