Missouri River Runoff Forecast Below Normal
The updated 2025 calendar year runoff forecast for the Missouri River Basin above Sioux City, Iowa, continues to be below average. May runoff in the Missouri River Basin above Sioux City was 3.4 million acre-feet, 100 percent of average.
“Heavy rainfall in western and central North Dakota and South Dakota during May supplemented the mountain snowmelt runoff,” said John Remus, chief of the



