To my knowledge, the Google satellite view is from USGS photography dating to March 2002. I offer this educated guess based on consistency in detail between the then-current map on TerraServer c.2004 (when it was free) and the current Google view which came out about that time to my recollection.

Incidentally, you can get a more modern view from TerraServer (as well as from other places I'm sure), but it'll cost you.

I really wish they'd update.