Low Mississippi River Levels Hit Grain Basis: Arkansas Study
Low water levels on the Mississippi River are driving up shipping costs for corn and soybeans, depressing local cash prices for farmers across Arkansas and the Mid-South as the harvest winds down.
The harvest is coming to a rapid close, but the recurring economic problem has returned to the vital export corridor. The river at Memphis sat at minus-1 foot on Oct. 29, according to the National Water Prediction Service. That level is projected to plunge to minus-8 feet by Nov. 12, as little or no rain is predicted in key parts of the river’s tributary system.
Barge Cost Shocks Weaken Corn and Soybean Basis
Agricultural economists with the Arkansas Agricultural Experiment Station and collaborating institutions published an analysis in Southern Ag Today examining how rising barge transportation costs pass through the grain marketing system. The study found that transportation-cost shocks weaken both corn and soybean basis, which is the difference between local cash grain prices and futures prices.
The strongest impacts hit Southern states along the lower Mississippi and Ohio river corridors. In the most exposed corn counties across Arkansas, Louisiana, Kentucky, and Tennessee, more than half of a barge rate increase reaches the farmgate as weaker basis.
A one-dollar-per-bushel increase in barge freight rates associates with corn basis declines of about 60 to 71 cents. For soybeans, the same increase associates with basis declines of about 49 to 53 cents in the most affected areas.
“The timing of the current low water levels is particularly concerning,” Yuan Zhang, a post-doctoral fellow with the department of agricultural economics and agribusiness and the Fryar Price Risk Management Center of Excellence, said. “With large volumes of newly harvested grain entering the market, transportation demand is already high. Low river levels can further constrain barge capacity and increase shipping costs, putting additional downward pressure on local grain basis.”
Farmers face lower cash prices for their crops precisely when many must make crucial marketing decisions.
Water Levels and Local Markets Affect Export Corridors
The Mississippi River serves as an essential export corridor for United States agriculture, carrying a substantial share of Midwest corn and soybean exports down to Gulf Coast export terminals. Falling water levels prompt navigation restrictions that slow barge traffic and elevate freight rates.
However, the effects are not uniform. Local market conditions shape the final impact on producers.
Corn producers located near processing facilities or in areas with greater competition among grain buyers experience lesser effects from transportation-cost increases. For soybean producers, distance from river export facilities plays a larger role in moderating these impacts.
The research team includes Zhang and Eunchun Park, an assistant professor in the same department and center, alongside collaborators from Utah State University and North Dakota State University. Their findings draw on elevator-level cash bids, barge freight data, and river-level information.
Evaluating Future Price Risk
Researchers suggest the findings can help farmers manage basis risk and assist policymakers in evaluating the economic value of maintaining and improving transportation infrastructure.
“If low river levels become a persistent problem, transportation disruptions may need to be treated as a recurring source of price risk rather than occasional events,” Zhang stated.
“Our research shows that these impacts are not evenly distributed across regions or commodities,” Zhang added. “Understanding these differences can help farmers make more informed marketing and storage decisions, while highlighting the importance of transportation infrastructure and alternative shipping options.”