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Bed-sediment, water, and suspended-sediment samples were collected from 33 sites on the Mississippi River and some of its tributaries. Four cruises were made at high water during a 16-month period from March 9, 1989, to June 27, 1990. The maximum measured water discharge was about 34,100 cubic meters per second on March 10, 1990, in the Mississippi River at Vicksburg, Mississippi, and the maximum measured suspended-sediment discharge was 1,330,000 metric tons per day in the Mississippi River at Thebes, Illinois, on June 13, 1990. Depth-integration and pumping methods were used at equally spaced locations across the river to collect two composite samples of river water containing suspended sediment. The depth-integrated composite samples were approximately 100 liters and the pumped composite samples were approximately 500 liters. Both sampling methods used Teflon or Teflon-coated parts to prevent chemical contamination. This report contains the following data associated with the samples: cross-sectional area of the river, water depths, depth-averaged velocities, water discharge, surface temperature and specific conductance, concentrations of the suspended sand and silt/clay and colloid fractions, and particle sizes of bed material and suspended sediment. These data provide the framework for interpreting subsequent chemical analyses of the water and suspended-sediment samples collected during the four cruises and for calculating bed-load transport in the Mississippi River and some of its tributaries.

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

Hydrologic and sedimentologic data collected during four cruises at high water on the Mississippi River and some of its tributaries, March 1989-June 1990