The main campground gets closed on occasion, but there are plenty of solid camping spots along the creek between Grey’s Mountain and Texas Flats. No toilets or running water, but the creek does flow year round. Bring sun screen and bug spray for sure. There are usually a lot of 4x4 folks camping in the area, so if you don’t want to be harassed you’ll need to find space away from the main trails (which isn’t hard to do).
Make sure to check out the falls that are a little below Greys Mountain campground. Tons of fun sliding on the rocks and jumping into the pools.