Illinois agricultural statistics recorded the harvest of 4,500 fewer acres of corn and 6,500 fewer acres of soybeans in Alexander County in 2011. Soybean production was 1,200,000 bushels in 2010 but dropped to 865,000 bushels in 2011 due to flooding from both the Ohio and Mississippi rivers and crop and soil damage. The floodwaters also scoured lands in some places and deposited sand in other locations.
Olson cautioned that, had winter wheat been planted outside the levees in the fall of 2010, the wheat crop would have drowned. "Illinois farmers are aware of the flooding potential, especially in the winter and early spring, so they don't plant winter wheat on unprotected bottomlands," he said. "Consequently, there was no crop loss outside the levees in April and May of 2011. Local floodwater in the lower Cache River Valley, south of the Mississippi River Diversion and Dike, could not flow back into the Ohio River. It was blocked by the Cache River levee on the south side and by the closed gate at the Ohio River levee. Instead, water backed up and flooded forested and agricultural lands along the lower Cache River and north of the Cache River levee," Olson said.
Olson said that the damage to the land could have been much worse. "Land use changes, diversion ditches and levees, loss of wetlands and flood-holding capacity, internal channelization of the Cache River and tributaries, and an ever-changing climate have altered the hydrology
|Contact: Debra Levey Larson|
University of Illinois College of Agricultural, Consumer and Environmental Sciences