It looks like it’s a boat launch. Google maps still shows the pre-renovation version, and it looks like the parking lot actually got smaller overall (that bit in the northwest that shows a paved trail in the renovated version was dirt/gravel and had road access and tire tracks, so it looks like that was another parking area) and the pier for the boat launch was rebuilt. That’s why it has those weird, very long parking spots on one side: they’re for cars with boat trailers.