Very nice shot ! I'll have to find this place someday!
Pretty easy to find. Its marked on all the maps. Prior to the 4WD road closure in Salt Creek Canyon south of Peekaboo, people used to drive to within a quarter mile of it. The commercial tour companies used to take visitors there almost daily. Since 1995, the most direct access requires a five mile hike to access the arch. The whole 20 mile length of Salt Creek Canyon contains more gems than a person would see while viewing England's crown jewels (imho).