It's right on the border of San Diego & Imperial counties in Southern California (the Mexican border is about 50 yards from the southernmost shooting lane at Carrizo Creek). Wish I could have made it out to the cleanup, but happy to see that THR's & (I'm assuming) Calgun's people were a part of that.
Edited for grammar and to add:
The place REALLY needed a cleanup. We always try and pack out most of our trash, and then some, but without an organized effort like this, the place would have likely been shut down.