Officials with the U.S. Army Corps of Engineers say there is no need to worry, but they have increased the annual runoff forecast for the Missouri River Basin above Sioux City to 127 percent of normal.
That’s 32.0 million acre feet compared to the average annual runoff volume of 25.2 million acre feet.
Runoff during March was actually 142 percent of normal, as a result of plains snowmelt runoff and ice breakup on the Missouri River and its tributaries.
As of April 3rd, mountain snowpack was 132 percent of normal in the reach above Fort Peck Dam, and 140 percent of normal in the reach between Fort Peck and Garrison Dams.
Runoff from the melting snow enters the reservoir system from May through July.
The total volume of water stored in the Missouri River Mainstem Reservoir System is 53.2 MAF, which is still below the base of the annual flood control and multiple use zone of 56.1 MAF.