Pumice Flat Campground sits along the San Joaquin River in Mammoth Lakes, offering one of the more remote camping experiences in the Eastern Sierra. Getting here requires patience—the access road is narrow, single-lane, and only open during summer months. That isolation is exactly the point. With just 17 campsites, this place stays quiet and uncrowded, which makes it a solid choice if you’re bringing a dog who does better away from bustling campgrounds.

The setting is genuinely peaceful. You’re right on the river, surrounded by the landscape that makes this part of the Sierra special. The sites themselves are well-maintained, and you’ll find potable water and flush toilets, which matters when you’re camping with a dog—easier to keep things clean and manageable. The narrow road means this spot attracts people serious about escaping rather than just passing through, so the atmosphere tends to stay mellow.

Dogs are welcome here, and the riverside location gives you plenty of room to walk and explore beyond your immediate campsite. The river runs calm enough in most spots that water-loving dogs can get in without too much concern, though you’ll want to check conditions when you arrive. Anglers love this place, so you’ll meet other visitors who are equally low-key about the outdoor experience.

One thing to know: this is a summer-only operation, and you can only access it by private vehicle. There’s no other way in or out. That remoteness means cell service is spotty at best, and supplies aren’t nearby, so come prepared. If your dog does well with a genuine retreat—not a destination with activities scheduled, but actual time in a quiet river setting—this campground delivers exactly that. The payoff for the narrow drive is genuine solitude and a camping experience that feels legitimately removed from regular life.