There are five dams in series, holding back a total of 700' of water.
The dams are the old dangerous all-earthen dams. They are already full. One is within 5' of the top now.
These floodgates haven't even been opened in almost forty years.
The record snow melt in the Rockies means this situation will continue at crisis through August.
If the first dam goes, it will cause the others to fail in sequence. The result would be a lot like an inland tsunami, heading for these Nebraska nuclear plants. Downtown St. Louis would be 100' underwater.