Nebraska City News-Press The reservoir inflows in the Missouri River basin above Sioux City, Iowa (Upper Basin) were well-below average in February. The 2021 calendar year runoff forecast for the upper basin remains below average. “Very cold February temperatures in the Upper Basin locked up tributaries in ice and reduced inflows to the system reservoirs,” said John Remus, chief of the U.S. Army Corps of Engineers’, Missouri River Basin Water Management Division. “Mountain snowpack continues to accumulate in the Rocky Mountains; however, plains snowpack is well-below seasonal averages and soil moisture continues to be much drier than normal,” he said.