Corn tonnages through Mississippi River Locks 27, near St. Louis hit their highest level since 2010 last week, the U.S. Department of Agriculture reported Thursday.

For the week ending May 7, corn tonnages through Mississippi River Locks 27 were 706,000 tons, the highest weekly count since May 29, 2010.

The USDA said that adequate navigation conditions and ample barge supply have facilitated the movement of barged grain.

The agency added that barge rates on the Upper Mississippi and Illinois rivers have been steady and are currently 35% to 38% below the five-year average.