I always liked seeing some FCFS sites at some of my favorite campgrounds. It didn't take long for people to find a work around the system, or worse yet, a city park operator, allowing huge discounts to first comers wanting to spend the entire Summer. So in this park, with 15 FCFS, they are filled till about Oct 1st.
I enjoy the SPs, but things have changed there over the years, as camping popularity increased. Many SPs in my area have sites reserved from Thursday through Sunday night. In many cases no one comes Thursday, but show up Friday after lunch, and not stay Sunday night, but leave early Sunday evening.
Likely won't get better anytime soon. Things change, over time, and not always for the best!
2oldman...hope your stay works out for you! :)
Jerry