
A tug boat operator on the upper Mississippi, based at Lock and Dam 11 near Dubuque, Iowa, helps barge tows through locks during high water. He handles about three assists per day when the river is near flood stage, moving grain, coal and salt.
High water raises the cost and difficulty of moving grain barges, which can widen basis spreads for river-accessible corn and soybeans. The effect described is operational rather than a new supply shock.
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, SOY 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.