Rada, R. G., Wiener, J. G., Bailey, P. A., and Powell, D. E., 1990, Recent influxes of
metals into Lake Pepin, a natural lake on the upper Mississippi River: Archives of
Environmental Contamination and Toxicology, v. 19, no. 5, p. 712-716.

Abstract:

The recent chronology of metal deposition was examined in Lake Pepin, a large
natural lake on the Upper  Mississippi River about 75 km downstream from the
Minneapolis-St. Paul, Minnesota, metropolitan area. The  lake, which has a high
trapping efficiency for suspended sediments, serves as a sink for metals from
industrial  and domestic effluents discharged into the river. Dating of a core with 
super(137)Cs indicated that inputs of  these metals increased markedly in the late
1950s, peaked in the early 1970s, and decreased in the late 1970s to  1981. Changes in
metal inputs to the lake would be most readily detected by analysis of sediments from
the  uppermost reaches, but the potential for release of sediment-associated metals to
the water column is probably  greatest in downstream reaches.

Keywords:

water-pollution, heavy-metals, sediment-pollution, sedimentation,
suspended-particulate-matter, domestic-wastes, industrial-wastes,
USA,-Minnesota,-Pepin-L.