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Was it coming from a substation? Might have been air blast switches.

500 kV bottom, 230 kV and 115 kV top photo?

If that's in the LA area, SCE uses a lot of 12 kV distribution. Some lower (4160) and some higher (16.5 and 33 kV). The higher off the ground the more deadly is how I view it. And then there's really high voltage that does freaky stuff, like this. http://youtu.be/hIkNY5xjy5k

That's going to vary from utility to utility. Standard residential/commercial distribution system here is 4800 V with some 13.2 kV in the outer suburbs.