I stumbled on this campground while visiting Rainy Lake, which is one mile North of Black Lake. This is a fun campground with a unique layout.
Unlike most campgrounds, the sites are not laid out on a grid. Spaces are spread seemingly randomly on the hillside just next to the lake and connected by thin hiking paths. There is no vehicle parking, but I could see bicycles and motorcycles having easy access to each campsite. A 4-wheeled vehicle will not fit in here. You'll need to park outside the campground and walk-in if that's your vehicle of choice.
The lake is visible from camp and easily accessible.