This infoboard, installed sometime in 2013 or 2014, summarized the history of the park, a 1970s photo of the picnic shelter, and the revised 1940 plan of the park.
1940 book in PDF format about South Carolina State Parks, produced the Works Progress Administration. Only one page is devoted to the wayside parks (page 42 in the book, page 44 in the PDF) with this summary of the wayside park amenities:
...and contain picnic shelters, fireplaces, combination table and benches, sanitary facilities, parking area for cars, and a caretaker's dwelling.The revised 1940 plan for the park, seen on the right side of the infoboard, has all these features. Since it's public domain, I made some changes in Lightroom (corrected the yellowing, added some clarity) and the result is this:
open parks network has preserved two photos of the latrine from the 1970s when some of the structure was still standing. This archived photo is with a park ranger:
archived photo is without:
I didn't find an easy path to this location, which was my first clue I would find nothing, and when I got to the area where the tank should be according to my GPS app I found no visible ruins. I managed to lose my phone for a while when I put in my shirt pocket to get through a thicket near the storage tank location. I managed to find within 20 feet of where I discovered its loss, but only after searching my track from the trail and back multiple times. The storage tank location search was a failure.
Next I moved on to the picnic area. I've been through this area several times, and now I have a better idea of what the smaller ruins were.
photo from open parks network, taken sometime in the 1970s, shows the picnic shelter in a deteriorating condition:
Since I was on the main trail anyway, I thought I'd pass by Upper Wildcat Falls to see how much water is flowing. The answer turned out to be not much at all.
The nearly hidden entrance to a trail along Slickum Creek, and the overgrown picnic area, is marked with a green stripe on a tree.
The waterfall not named on the master plan is appropriately enough, named Last Falls on Slickum. The waterflow on this creek was much better. While I did take a photo of the waterfall, I didn't put much effort into it since it wasn't the focus of my trip.
While following this trail, I came across an old path that could have been a logging road or an old trail. This path was overgrown, but still easily visible, and mostly followed a small stream that flowed into a small waterfall behind the telephone cabinet. I managed to find a bottle whose spirits have long departed, if you know what I mean.
I've shared my photos to an album on Flickr and an album on Google Photos.
I've also created this map showing the locations of the old, abandoned features marked on the master park map: