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Surficial sediment characteristics in Pools 4 and 8, Upper Mississippi River

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Moisture content, bulk density, and organic content of surficial sediments were estimated with a penetrometer in Navigation Pools 4 and 8 of the Upper Mississippi River during 1994 and 1995. Mean moisture content of sediment was low in both Pool 4 (39%, SD = 15.0%) and Pool 8 (34%, SD = 13.7%), suggesting that soft, fine sediments are uncommon in these pools. Sediment in much of the off-channel habitat was found to have similarly low moisture content. Sediment in small backwaters was particularly low in moisture content, although areas with sediment moisture content greater than 70% were found in small backwaters. Sediment in the large backwaters of Pool 4 was similar to sediment in the small backwaters of Pools 4 and 8, while in Pool [...]

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James T Rogala

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  • Upper Midwest Environmental Sciences Center (UMESC)

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U.S. Geological Survey, Environmental Management Technical Center, Onalaska, Wisconsin

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