The 1993 flood on the Mississippi River in Illinois Bhowmik, N. G., et al, 1993. The 1993 flood on the Mississippi River in Illinois. Illinois State Water Survey, Champaign, Miscellaneous Publication 151. Reprinted by the National Biological Survey, Environmental Management Technical Center, Onalaska, Wisconsin, March 1994. LTRMP 94-R002. 149 pp. (NTIS #PB94-165552) ABSTRACT This report on the 1993 flood on the Mississippi River in Illinois and on the lower reaches of the Illinois River was prepared by the Illinois State Water Survey with assistance from the Illinois Department of Transportation/Division of Water Resources and the Illinois Natural History Survey. The report begins with a brief description of the physical setting of the Upper Mississippi River System, including historical facts on climate, precipitation, hydrology, and floods. The 1993 flood is discussed with regard to precipitation, soil moisture, stages, flows, levee breaches, and discharge through levee breaches. Also discussed are impacts of the flood on social, economic, hydraulic and hydrologic, and environmental aspects of the river and its residents. Impacts on water quality, the environment, and public water supplies, including the beneficial and detrimental aspects of the flood, are also included. The lessons learned from this flood focus on the performance of the levees, governmental responses, information dissemination to the public on the effects of flood fighting, change in stages due to levee breaches, flood modeling, and the lack of information dissemination to the public on the technical aspects of the flood. These lessons point out information gaps and the need for research in the areas of hydraulics and hydrology, meteorology, sediment transport and sedimentation, surface and ground-water interactions, water quality, and levees. The report presents a comprehensive summary of the 1993 flood as far as climate, hydrology, and hydraulics are concerned. KEYWORDS flood, Mississippi River, Illinois River, 1993 flood, levees, flood flow, stages, climate, precipitation, soil moisture, flood damage, ground water