Summary of water quality characteristics at Navigation Pool 26 Anderson, R. V., J. W. Grubaugh, and D. B. Markillie. 1991. Summary of water quality characteristics at selected habitat sites - Navigation Pool 26 of the Mississippi River, July 17 through October 31, 1988. Report by Western Illinois University, Macomb, Illinois, for the U.S. Fish and Wildlife Service, Environmental Management Technical Center, Onalaska, Wisconsin, March 1991. EMTC 91-01. 48 pp. (NTIS # PB91 174128) ABSTRACT Resource Trend Analysis water quality and sediment sampling in Pool 26 of the Upper Mississippi River System was initiated in August 1988 as part of the Long Term Resource Monitoring Program. Water quality sampling from 17 locations began during the first week of August. Over 2000 water quality measurements were made under the Resource Trend Analysis component of the Long Term Resource Monitoring Program on Pool 26 during the sampling period, August 1, 1988 through October 31, 1988. The Illinois River had higher conductivity and turbidity and lower transparency than other sites. Velocity and dissolved oxygen were also usually lower in the Illinois River. These differences may effect water quality parameters in the Mississippi River below its confluence with the Illinois River. Water clarity was very good throughout the study period, indicative of stable flows and low inputs from the drainage basin. KEYWORDS Mississippi River, Pool 26, water quality, sediment, trends, Illinois River