Above it's mentioned by the owner to go to camp.in.gov I hope this helps.
It depends on the day of the week you're going, whether it's a holiday, the time of year, whether you want primitive or electric campsites, and I believe whether you're doing a tent or RV. I think you have to stay at least 2 nights, but that may only be a weekend thing.
I've had that same issue, I've always ended up having to call to get pricing. Sorry
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