We spent 2 hours and 30-40 miles looking for this place. Nobody had ever heard of it. Not the Sheriff's Department, not the Park Rangers, not the people at Irvine Lake (They tried to tell us which way to go actually, but we never found the road they said.)
I have reasonable doubts that the place doesn't exist. We were pursuing untamed avians.
Even so, it was a good trip. I'll update this post with a picture of our campsite when I unload the car and bring in my camera.
Update: