The test facility was established by Caltech, which was developing weapons for the Navy at its Naval Ordnance Test Station (NOTS) at China Lake (town), near Ridgecrest, California. It today is now known as the Naval Air Weapons Station China Lake, and is still the primary proving ground for naval weapons systems. Because China Lake is a dry lake in the Mojave Desert, Caltech opened this substation at the Morris Reservoir, near their campus, north of Azusa in the San Gabriel Mountains.