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The U.S. Army Engineer Research and Development Center, Coastal and Hydraulics Laboratory, Field Data Collection and Analysis Branch collected bathymetry data and water surface elevations during the 2011 Flood. According to the gage at Vicksburg, MS, the flood peaked at a stage of 57.1 and a flow of 2,310,000 cubic feet per second (cfs) on 17 May 2011, both the highest of record. The reported water surface data include a continuous water surface profile from river mile (RM) 597 to RM 362 and water surface measurements in the vicinity of the Yazoo Backwater levee and Vicksburg, MS. Bathymetry data were also collected and include five sets of surveys, compatible with the Integrated Section Surface Difference over Time Version 2 (ISSDOTv2) method of measuring bed-load transport. These five sets were surveyed at flow rates between 1.6 million and 2.3 million cfs. ISSDOTv2 was used to calculate bed-load transport for the five sets of data. These new bed-load data populate the Lower Mississippi River bed-load rating curve at higher flows and provide a higher level of confidence in the higher-flow portions of the curve. The resulting curve can be a powerful tool for inferring past bed-load transport and predicting future transport. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents. DESTROY THIS REPORT WHEN NO LONGER NEEDED. DO NOT RETURN IT TO THE ORIGINATOR. MRG&P Report No. 18 iii

Bed-load and water surface measurements during the 2011 Mississippi River Flood at Vicksburg, Mississippi