A massive, old gravel quarry from the look of it.
Havasu BLM is Dispersed camping. Relatively flat, a lot of space to find a spot to park. Surfaces are hard packed generally with gravel base. Only 6 miles from Lake Havasu City makes for a great location. AT&T 4G signal 3 bars more or less. A great spot to lay over, bring your OHV to run around in the hills, or bring your boat and head to the lake!