High Water

 Spring rain on a big snowpack is producing high water in the Montana rivers that drain out of the Rocky Mountains.  And that translates to a Missouri River flow that's much higher than median. In the graphic above, you can see how far above median it is at Great Falls.  The graphic below puts things into perspective.  Although the river is much higher than normal, there have been many years when the annual peak flow was at or higher than this level.