Runoff Forecast Remains Above Average
Reservoir inflows in the Missouri River basin above Sioux City, Iowa (upper Basin) were well-below average in March. The updated 2021 upper Basin runoff forecast is 21.3 million acre-feet (MAF), 83 percent of average.
“Abundant precipitation fell during March in the lower Basin below Sioux City, Iowa, however, March precipitation was less than 50 percent of normal over much of the upper Basin,”