||Chemical and Physical Characteristics of Lakes in the Upper Midwest, United States (Journal Version).
Eilers, J. M. ;
Brakke, D. F. ;
Landers, D. H. ;
||Northrop Services, Inc., Corvallis, OR. ;Western Washington Univ., Bellingham. Inst. for Watershed Studies.;Corvallis Environmental Research Lab., OR.
Water pollution ;
Chemical properties ;
Physical properties ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
A statistical sampling of 592 lakes, representing an estimated 8575 lakes, was conducted in northern Minnesota, Wisconsin and Michigan during Fall 1984 as part of the EPA's Eastern Lake Survey. The survey was designed to quantify the number of lakes with surface area greater than 4 ha that are acidic or that have low acid neutralizing capacity (ANC). The largest estimated number (102) and percentage (9.8%) of acidic lakes (ANCO) in the upper Midwest were found in the upper peninsula of Michigan. There were an estimated 45 acidic lakes in the northcentral Wisconsin, representing 3% of the target lakes, and the highest percentage (41.4%) of low ANC lakes was also observed in this area. Sulfate concentrations were greatest in the upper peninsula of Michigan and were intermediate in northeastern Minnesota. Acidic lakes had low concentrations of major base cations and high sulfate concentrations and were most common in areas receiving greatest acidic deposition.