Water quality of four lakes in Lakeville, Minnesota

Water-Resources Investigations Report 80-66




Water-quality characteristics were determined for four lakes (Marion, Orchard, Kingsley, and Lee) in Lakeville, Minn., to provide background data and evaluate changes in lake water quality that may occur with urbanization. Thirteen samplings were done from March 1976 to October 1978. Physical characteristics of the lakes were defined and selected chemical and biological constituents were determined. Calcium carbonate precipitation is suggested by pH values as high as 10 near the surface and a decreases in the calcium concentration when magnesium, sodium, and chloride concentrations increase. Pollution of part of Marion Lake is indicated by chloride concentrations that increased from 18 to 57 milligrams per liter between June and October 1978. The eutrophic state of the lakes is suggested by supersaturated dissolved oxygen near the surface and dissolved-oxygen concentrations less than 0.1 milligram per liter near the deepest parts of the lakes in summer. Total phosphorus and chlorophyll a concentrations and Secchi-disk transparencies were used to determine the trophic state of the lakes. Trophic state indices were as high as 69.2. Phosphorus concentrations were significantly higher in Lee and Kingsley Lakes than in the other lakes sampled. Anacystis and Oscillatoria were the dominant phytoplankton genera. Phytoplankton blooms occurred throughout the year with the highest sampled concentration yielding 890,000 cells per milliliter during September 1976 in Lee Lake. (USGS)

Additional Publication Details

Publication type:
Publication Subtype:
USGS Numbered Series
Water quality of four lakes in Lakeville, Minnesota
Series title:
Water-Resources Investigations Report
Series number:
Year Published:
U.S. Geological Survey, Water Resources Division,
vii, 51 p. :ill., maps ;27 cm.