
Low Mississippi River levels have cut southbound grain shipments by roughly 79 percent since early harvest, with soybean movement down nearly 90 percent. Gauges at St. Louis and Memphis are near record lows, and barge costs have risen sharply.
Higher barge freight and reduced river capacity widen basis discounts for Midwest corn and soybeans and can shift export business toward Brazil and Argentina.
Not enough comparable past events yet for a historical read.
After 359 past bearish logistics events, Corn moved a median -0.3% over 5 sessions (44% higher; middle half -1.5% to +1.5%), and -0.5% over 20.
After 297 past bearish logistics events, Soybeans moved a median +0.3% over 5 sessions (54% higher; middle half -1.5% to +1.8%), and +0.7% 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.