Just outside of Milford, CA in Plumas National Forest is this tiny campground right off of the Milford Grade. There are about 6 sites but some were so overgrown that they would not be pleasant to stay at. 

There is a vault bathroom but no water or trash. 

During the season is runs $15/night plus $7 for additional vehicle. We stayed one night on the off season in April and it was free. 

The sites did have picnic tables and fire pits though some fire pits were overgrown with grass. Some sites are very small and will only fit a car and tent. Quite a few people drove through the campground but chose not to stay.

This is a good spot for a night while traveling through but I am not sure why anyone would want to stay longer than that as there is not much hiking except for the main dirt road. The paved part of the road is full of rundown abandoned trailers and houses. The dirt road into the campground was fairly smooth. 

We were the only people there that night. If the campground was full then you would be able to see just about everyone there from any site so zero privacy. 

Cell reception was barely usable with a WeBoost, without that there was none with AT&T, Verizon and T-Mobile.