Indiana soybean crops produced higher yields than expected after damage from record rainfall over the summer.
So far, 41 percent of the state's soybean crop has been harvested, up from 17 percent at this time a year ago.
The decline could hurt farmers, but high yields in other parts of the country mean grocery prices likely won't be impacted.
Agricultural experts will outline their predictions Wednesday for what this year's harvest might look like; gas prices in central Indiana are going up again.
There have been only four days this month without rain. All that water has farmers concerned over potential flood damage.
Economists have told grain farmers to expect, at best, to break even with a good yield, and harsh weather could diminish farmers' harvests.
Record yields are leading to a decline in corn prices and a shortage of places to store crops.
The Surface Transportation Board will release weekly reports about rail service issues amid requests from farmers eager to transport high grain yields.
Soybean and corn prices are being driven down by increased supply from both within the U.S. and internationally.
Agriculture economists are predicting a second straight record year for the state's corn production.