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Twenty-nine navigation pools are present along the reach of the Mississippi River from Minneapolis, Minnesota, to St. Louis, Missouri. A representative composite surficial bed-sediment sample was collected from the downstream one-third of 24 of the 29 navigation pools during a research cruise to assess the distribution of sewage-derived contaminants, selected organic contaminants, and major and trace elements after the flood of 1993 on the Upper Mississippi River. The particle-size distribution of a subsample of surficial bed sediment from each pool was determined by sieve, visual-accumulation tube, and SediGraph methods. Bulk chemistry (percent nitrogen, carbonate carbon, total carbon, total organic carbon, and total volatile solids) was determined for a second subsample of the surficial bed sediment. The hydraulic conditions present at the time the surficial bed-sediment samples were collected were measured, and about 40 percent of the water discharge was measured outside the navigation channel in backwater areas ranging from 0.3 to 3.0 meters deep. The water velocities in the backwater areas were about 60 percent of the velocities in the navigation channel. Flushing rates ranged from 0.3 hour per kilometer to about 1.7 hours per kilometer. The median particle diameter of the surficial bed sediments ranged from 0.002 millimeter to 0.419 millimeter, and the organic carbon associated with these sediments ranged from 0.12 to 3.79 percent.

u.s. geological survey open file report/open-file report

Hydrologic, sedimentologic, and chemical data describing surficial bed sediments in the navigation pools of the upper Mississippi River, after the flood of 1993