I'm presently adding this entry primarily for tracking purposes as there's some disagreement on how exactly this will unfold, and be fulfilled.  Some of this comes from the fact that I'm hearing two or more versions of this prophecy, as well as a number of predictions about the fate of the Hoover Dam (reliable predictions) from non-prophecy sources.  The first prediction, among many, is that the Hoover Dam will simply crack, but not fail, and that will be a sign of the fall of the occult and satanic powers in this country.  Another says that it will collapse, in a terrorist attack or bombing.  Others have predicted that a nearby earthquake would fracture the dam, damaging it so heavily that it would fail catastrophically.  I'm not sure which of these predictions is right, or if all of them are right (ie, I'm seeing a sequence of events, rather than a singular one).  So, for now, I've placed this entry here to collect proofs and prophecies, in an effort to better track, and distill down this prophecy in such a way as to make my presentation of it more accurate.