Bed material characteristics of the Mississippi River Adams, J. R. 1992. Bed material characteristics of the Mississippi River within Pool 19. Illinois State Water Survey, Champaign, Illinois. Contract Report 535, ISSN 0733-3927. Reprinted by U.S. Fish and Wildlife Service, Environmental Management Technical Center, Onalaska, Wisconsin, January 1993. EMTC 93-R006. 113 pp. (NTIS #PB94-154655) ABSTRACT The bathymetric and bed material characteristics of Pool 19 on the Mississippi River have been analyzed and presented in this report. These data are illustrated and described at 13 main channel, 2 side channel, 1 tributary mouth, 1 island cross channel, and several spot locations in side channels. The river was traced from river mile 410.0 in the tailwater below Lock and Dam 18 to river mile 364.5 just upstream of Lock and Dam 19 and the power plant at Keokuk, Iowa. More detail was given for several areas where habitat succession is taking place as sedimentation raises the bed near enough to the water surface so that rooted macrophytes can become established and survive floods and winter ice cover. Both the plan view charts and the cross sections show a variety of channel shapes. Similarly, there is some change in bed material characteristics longitudinally, though the main channel has a medium sand bed except for the mile or two of bedrock upstream of Lock 19 at Keokuk. An expanded sampling program would be able to fill in information for the reach between river miles 378 and 394, and obtain samples during different flow regimes. Sites could be selected for more frequent sampling, with annual sampling along the entire pool. KEYWORDS Mississippi River, Pool 19, bed material, velocity, particle size distribution, bathymetric