Mississippi River levels may lower grain basis for Southern farmers

The Mississippi River at Memphis reached -1 foot on Thursday, Oct. 29, according to the National Water Prediction Service. This decline comes as the harvest nears its end, with water levels projected to drop further to -8 feet by Nov. 12.

The National Weather Service has projected that little or no rain will fall in key areas of the river’s tributary system in the coming weeks, failing to raise water levels. These conditions create a bottleneck for U.S. agriculture, as a substantial portion of soybean and corn exports from the Midwest move via barge through the Mississippi River system to Gulf Coast export terminals. Low river levels can constrain barge capacity and increase shipping costs, which in turn lowers the local grain basis—the difference between futures prices and local cash grain prices.

Impacts on Southern Grain Basis

Research from the Fryar Price Risk Management Center of Excellence and the Arkansas Agricultural Experiment Station, involving collaborators from North Dakota State University and Utah State University, indicates that farmers in Southern states along the Ohio and lower Mississippi river corridors are the most exposed. In the most affected corn counties across Tennessee, Kentucky, Louisiana, and Arkansas, more than half of any barge rate increase is passed to the farmgate as a weaker basis.

The study found that a $1-per-bushel increase in barge freight rates correlates to the following basis declines in the most exposed areas:

• Corn: approximately 60 to 71 cents
• Soybeans: approximately 49 to 53 cents

Harvest Timing Puts Downward Pressure on Grain Prices

Yuan Zhang, a post-doctoral fellow involved in the research, noted that the timing is “particularly concerning” because high transportation demand coincides with large volumes of newly harvested grain entering the market. Zhang stated that this puts “additional downward pressure on local grain basis,” meaning farmers may see lower cash prices while making critical marketing decisions.

The research highlighted that these impacts are not uniform. Soybean producers are more affected by their distance from river export facilities, while corn producers are less impacted if they are located near processing facilities or in areas with higher buyer competition. Zhang suggested that if these low levels persist, transportation disruptions should be viewed as a “recurring source of price risk” rather than occasional events.

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