The Mississippi River (north of St. Louis, MO) and its tributaries (e.g., the Arkansas River, Illinois River, Ohio River, etc.) make use of a series of locks and dams to bring traffic up and down the waterways. Grain generally flows south from the relatively production-rich areas of the Midwest to export ports in Louisiana and feed markets in the southeast.

This dataset provides weekly information on the amount (in tons), location, and commodity of barged grain transiting the following three major points: (1) the last lock on the Mississippi, Mississippi Locks 27 (called "Miss Locks 27" in the dataset), which captures downbound traffic from the Upper Mississippi and Missouri Rivers; (2) the last lock on the Ohio River, Olmsted Locks and Dam (called "Ohio Olmstead" in the dataset), which captures any downbound traffic on the Ohio and Tennessee Rivers; and (3) the last lock on the Arkansas River, Arkansas River Lock and Dam 1 (called "Ark Lock 1" in the dataset).

Ohio Olmsted locks replaced Ohio Locks 52 beginning in November 2018.

Commodities include "corn," "soybeans," "wheat," and "other" (oats, barley, sorghum, and rye).

Combined, these three locks give a sense of barge grain traffic (by commodity) on the Mississippi--since grain shipments heading south from the Upper Mississippi River, Illinois River, Ohio River, and Arkansas River are captured. Note, however, that this data does not include all grain barge movements on the Mississippi Rover System, as some grain originates on the Mississippi below the locking portion (south of St. Louis, MO). Grain traffic originating below Lock 27 on the Mississippi is about 10 to 30 percent of total downbound grain shipments, which varies year to year.

A similar dataset, "Upbound and Downbound Loaded and Empty Barge Movements (Count)," contains information on the count of grain barges moving down the locking system (https://agtransport.usda.gov/d/w6ip-grsn) versus this dataset that shows tonnages.

Data is collected weekly from the U.S. Army Corps of Engineers' Lock Performance Monitoring System.

This dataset provides weekly information on the number, location, direction, and type of barges transiting the following three major points: (1) the last lock on the Mississippi River, Mississippi Locks 27 (called "Miss Locks 27" in the dataset); (2) the last lock on the Ohio River, Olmsted Locks and Dam ; and (3) the last lock on the Arkansas River, Arkansas River Lock and Dam 1 (called "Ark Lock 1" in the dataset). (Olmsted locks replaced Ohio Locks 52 beginning in November 2018.)

The data offers insight on barge movements over time. One variable is "direction", which consists of upbound ("Up") and downbound ("Down"). It also offers insight on the "type" of traffic (e.g., empty barges, loaded barges, grain barges, and non-grain barges). More specifically, upbound data includes the number of empty barges and the number of loaded (any commodity) barges transiting the locking system. Downbound data includes the number of empty barges, the number of grain barges (loaded), and the number of non-grain (loaded) barges. That is, grain and non-grain sum to total loaded for downbound traffic. will Due to data availability, prior to 10/15/2000, downbound data includes just empty and loaded counts.

A similar dataset, "Downbound Barge Grain Movements (Tons)," contains information on the tonnage (and commodity) of grain moving by barge down the locking system: https://agtransport.usda.gov/d/n4pw-9ygw/.

Data is collected weekly from the U.S. Army Corps of Engineers' Lock Performance Monitoring System.