As of June 1, I believe it was $30 for a riverside lot with no amenities and $33 for riverside with electric. There are no lots with water or sewer. There are numerous picnic areas throughout the park and a really nice place to get in the river under the park access bridge. Cleanest water you'll ever find. Plenty of hiking and biking.
Camp ground prices are 28.00 and up per night dependind on site amenities
My friends and I took our kids for a day trip. We hiked and played in the water. We saw people that were using inflatables and pool noodles. I noticed that there's a campground. Since we didn't camp I don't know the details about that and cost. Parking was free and we didn't have to pay to enter the park. I've only been once. I hope I was of some help.
Thanks! Your answer is awaiting moderation.