The Army Corps St. Paul District closed the 2018 navigation season on the Upper Mississippi River. The last tow departed St. Paul on November 25 and the last southbound lock passage was on December 1.
The seasonal close ends barge movement from the upper river until spring, so northern grain shipments move by rail or truck during winter. The effect on prices is routine and limited.
Not enough comparable past events yet for a historical read.
After 1,054 past logistics events, Corn moved a median -0.1% over 5 sessions (48% higher; middle half -1.5% to +1.5%), and -0.0% over 20.
After 837 past logistics events, Soybeans moved a median +0.4% over 5 sessions (55% higher; middle half -1.5% to +2.0%), and +0.6% over 20.
Moves of each commodity's benchmark from the last close before the event. Historical reads pool past events of the same kind; they describe what happened, not what will. Not investment advice.