This is a beautiful campground waaaay out on the back side of Mammoth mountain, and very near to the pack station with a little store for backpackers. There are famous hikes (Rainbow falls- beware it is downhill there but all uphill back and you must be moderately fit to hike this!!!, and Devil’s Postpile which we didn’t hike and so I cannot comment). The bathrooms were clean, and the Camphost kindly came out to meet us as we arrived after dark. This is a very popular campground, as are the others close by, do not arrive late and expect a spot in the summer. The 4 stars is mainly because of the road, not the campground. We towed a 23 ft trailer. This campground is 8 miles of twists and turns and an often bumpy and narrow road. They will be working on it, the snow did a real number last winter, but when I’m not sure. There is quite a ways of a steep grade to get down. The uphill traffic has the right of way, and there are places where coming down you might have to back up to allow traffic as it’s nearly one lane. In some ways I’m quite glad we arrived after dark because we couldn’t see the cliff the road is built on; the drive back up was pretty terrifying with no shoulder or rails and a sheer drop off. Incredibly, there are large shuttle buses going up and down all day from the ski area up top, and we very nearly were hit by one coming around a curve. I personally would never take a class A motor home down and up that road, until they widen and guardrail it! That said, we had a sweet few days in the campground. It was lush and green late August due to summer rains, and there were some mosquitos. The forestry service is doing a lot of great work clearing underbrush and thinning trees, but I wouldn’t want to be there if a fire started…Very beautiful spot though.