You cant beat free!
We spent a night here on our way to Ohio. It has a small loop of campsites near the river. It is a one lane road to get to the campground and can get tight when other vehicles pass, but we got down there with our F250 truck and camper when a big grater and the park ranger came by. It's very doable. Campsites were mowed and it was a short walk to a really nice spot on the river. No electric/water, so plan to be ready to be off grid. Hard to complain about free!
Sitefirst site as you pull into campground
Month of VisitJune