"The amount of water flowing down the lower Missouri River this year is approaching the record set during the historic 2011 flood, and another round of flooding is expected this week after unusually heavy rains upstream, federal officials said.
Heavy rains dumped more than four times what is normal in parts of Montana, North and South Dakota and Nebraska last week — triggering flood warnings and forcing the forecast for how much water will flow down the Missouri River to jump by 4 million acre feet (1.22 million meters) to 58.8 million acre feet (17.92 million meters).
That will be second only to 2011's 61 million acre feet (18.59 million meters), and it means the river has stayed high all year long. Previously, the second highest runoff year was 1997 when 49 million acre feet (14.94 million meters) of water flowed down the river and caused major flooding."
Josh Funk reports for the Associated Press September 16, 2019.