While traveling from St. Louis to Kentucky we happened upon Lynnville RV Park just off I-64. We checked in through the honor system as the store/office closed at 5p; we filled out a registration form put $22 in it and put it in the mail slot-have to say I have not seen that before. The grounds were clean and maintained, it sits along a river so there were many there with boating and fishing gear-there were a lot of campers there but it was a very quite night. It's a nice little campground, the sites had fire rings, grills and picnic tables; some sites are actually on the river. We will probably stop there again on the next trip to Missouri.