No, but be prepared that when you arrive the park may be full. In other words have a back up plan.
The park technically opens at 8am, I have had multiple parties there and we just arrived early like by 7 am to get the bigger spot and you should be fine. No reservation needed.
Try calling the county parks folk FIRST....They can tell you how to go about it fairly
Or, try to get someone to go early and save a spot?
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