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A KCRG explainer describes how the Mississippi River lock and dam system works, noting that about 60% of US grain exports move on the river. It describes locks operating by gravity and a route of 39 lock and dams from Minneapolis to the Gulf.
The article is background on river infrastructure, and it underscores that lock performance drives Gulf grain flows and freight costs, but it reports no new change in supply or price.
Not enough comparable past events yet for a historical read.
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.