You will need to speak to the Ranger Station in Kernville. They can guide you.
You can reserve a spot but not a particular spot! Its a first come first serve kind of thing. Best to google the campground your interested in and they will give you the online site of a private state company who now controls all of California's Forestry owned campgrounds. They also have an office at the entrance to the dump here! You can also use their online site to pay and get info for getting your fire permits which are now required!
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