Absolutely amazing free dispersed camping at Silurian dry lake bed.
Visited in late December, and there were zero other campers out on the lake bed. Lots of entrances to the site from the highway, just be sure to follow an already made path. The farthest you can camp is about a mile off of the road. Very level, great place for boondocking.
This is BLM managed land, make sure to go online for a free fire permit if you plan to have a campfire.