In the woods, close to mountains, close to rivers, on a small creek

It's a relatively small loop campground along a creek, close to the Pend Oreille River. Gravel road, ideal for tent camping. When we camped there in September of 2017, there were 3 occupied spaces, all of whom left the next day so we had the whole campground to ourself. There were primitive bathrooms, and from my memory no running water. I also don't think we paid, because we couldn't find anyone to give money to. Maybe this is because it was fall, or maybe it's actually free. Either way, pleasant experience here!