Remember the crisis earlier this year at the Oroville Dam?
The overflow from California's winter of heavy rain threatened to overpower our country's tallest dam. A cascading failure of the dam's main gates, its primarily spillway AND its emergency spillway had the world watching hour by hour to see if a catastrophic breach was going to occur.
Fortunately, the rains stopped long enough for the situation to be brought under control. The dam remains in place and repair crews have been working all spring and summer.
But should we breathe easy at this point? Not at all, says dam safety expert Scott Cahill.