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In late April 2011, unrelenting spring rains pounded the basin once again, and water levels on the Ohio and Mississippi Rivers rose to record levels. The top image, taken by the Landsat-5 satellite on May 3, 2011, shows the confluence of the two swollen rivers. The lower image shows the rivers at normal spring levels in 2010. In 2011, floods blanket farmland along both rivers.
In the face of potentially disastrous flooding, the U.S. Army Corps of Engineers set into motion a plan devised after the devastating floods of 1927. They decided to flood the New Madrid Floodway south of Cairo, Illinois and the confluence of the two rivers.
Following the 1927 floods, the Corps built a series of floodways, including the New Madrid Floodway, along the Mississippi River’s historic floodplain to act as a sort of pressure valve when floods threatened to overwhelm the levees. The 1927 floods showed that no levee system could contain the mighty Mississippi River during big floods. 2011 marks the first (and only other) time since 1937 that the New Madrid Floodway has been used.
In the top image, the muddy water extending south of the Bird’s Point Levee is flowing over farmland in the New Madrid Floodway. The overflow into the floodway relieved flood conditions upstream. At the time the image was taken, the Ohio River in Cairo was at 60.62 feet (18.48 meters), down from a record peak of 61.72 feet (18.81 meters) on May 2 before the Corp blasted the levee open. Flood stage is 40 feet (12 meters).
“This is the flood that engineers envisioned following the 1927 flood,” said U.S. Army Corps Mississippi Valley Division Commander Maj. Gen. Michael Walsh in a May 2 news conference. “It is testing the system like never before and now is the right time to activate the floodway.”
By opening the floodway, the Corps intended to relieve pressure on the entire river system, hoping to avoid a repeat of the 1927 disaster. “Making this decision is not easy or hard—it’s simply grave—because the decision leads to loss of property and livelihood—either in a floodway—or in an area that was not designed to flood,” Walsh said.
- Advanced Hydrologic Prediction Service. (2011, May 5). Ohio River at Cairo. National Weather Service, National Oceanic and Atmospheric Administration. Accessed May 5, 2011.
- Gough, S. (2011, May 2). Blowing up Birds Point; interview with Jon Remo. Riparian Rap. Accessed May 5, 2011.
- Kosar, K. (2005, October 25). Disaster response and appointment of a recovery czar: The Executive Branch’s response to the flood of 1927. CRS Report for Congress, Congressional Research Service, The Library of Congress. Accessed May 5, 2011.
- Opperman, J. (2011, April 29). Rising floodwaters compel hard decisions. Cool Green Science, the Nature Conservancy. Accessed May 5, 2011.
- PBS American Experience. (2000). Fatal Flood. Accessed May 5, 2011.
- Rochette, S. (2011, May 2) USACE operates New Madrid floodway to control flooding. U.S. Army Corps of Engineers. Accessed May 5, 2011.
- Landsat 5 - TM
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