I do realize that the snake pictured here does not have an obvious, horn-like scale over the eye. My ID was based primarily on the odd sideways manner in which it moved. Have you heard of Western Rattlers moving this way?
That's actually a speckled rattler,Crotalus mitchelli, a common rock dweller in much of the Mojave. Sidewinders do prefer the flats, but diamond-backs are mostly down there as well. Diamond back tails have distinct black and white banding. Check out