I give this campground 2 stars - one because it is a lovely spot and two, because it is well-maintained considering its remoteness. The other 2-3 stars it may well have deserved were blacked out by the sheer numbers of outright rude and inconsiderate campers.
The drive into the canyon is, indeed, bumpy but doable in a high-clearance car or SUV. There is no cell service. The campground is near the river but does not have river access - it is possible to get to it but the stickers make it extremely uncomfortable, especially if your bring your pooches. There are some places to walk and see both the ruins of the Mills orchard homestead, as well as access the river, but walking was made very unpleasant by the numbers of trucks, ATVs, and motorcycles zooming by - very loud and lots of dirt in the eyes and mouth.
Not sure if it's the "COVID camping" phenomena but the campground was full to near-full the 3 days, 2 nights we camped there. During that time there were multiple very large groups (10-16 people) of people pulling in and out. One group from Texas brought along very loud 50cc motorcycles and large ATV/Side by sides for their kids, who would make rounds around the campground loop, sending plumes of fine dirt into all of the campgrounds around the loop, not to mention the noise. Another large group of trucks from Texas pulled into the campsite next to ours and literally drove 6 vehicles into the actual camping spot and proceeded to then set up tents all the way into my spot -- loud music, loud talking, loud wood chopping, 4:30 am trucks in and out (I suppose they were driving to the bathroom, which was about a 2 minute walk away). I was forced to sleep in my car, instead of my tent thanks to the noise and the fact that I was not comfortable sleeping with a bunch of strangers who didn't seem to care that I had already set up there. As I packed up the next day and was checking my campground for trash I noticed theirs was strewn with it - I considered cleaning it until I noticed it was mostly used toilet paper.
Camping in New Mexico is amazing and one of the reasons I live here. I don't understand why people need to come to the middle of nowhere to be obnoxious, ruin the experience for everyone else, and trash the place in the process.
Until the COVID camping phenomena ends, expect the worst.