Name:   MrHodja - Subject:   Lake Level Date:   8/15/2016 10:33:04 AM

That is a pretty extreme situation but I would think it didn't come without warning.  As soon as such an event became a possibility APCO would run all four turbines at the dam, sending that water downstream before the deluge.  They also wouldn't wait for the level to get to 491 before opening the spillway gates.  It seems they employ multiple methods to manage as best as possible.