2007 National Lake Survey - Wisconsin Results
Wisconsin Summary Results
Berry Lake, Oconto County
DNR Photo
NOTE: Only the data collected during the 2007 National Lake Survey are included here, and most will not be available until late 2008. This page contains histograms, graphs showing data distributions, for the various water quality indicators.
Currently available data include:
- Secchi disc transparency
Apparent color
Chlorophyll a
Alkalinity
pH
Specific conductance
Wisconsin Trophic State Index
Secchi disc transparency
The secchi disc transparency is a measure of water clarity and is affected by algal growth, plankton, natural water color, and suspended solids. For more information...
Figure 1: Distribution of Secchi Disk Transparency in Wisconsin lakes
Apparent color
Apparent color is a measure of naturally-occuring humic acids in lake water. Humic acids leach from vegetation in the watershed giving lake water the appearance of tea. Color is measured with Standard Platinum Units (SPU) and lakes greater than 25 SPU are considered 'colored'. Figure 2 illustrates the distribution of color in Wisconsin's 29 National Lake Survey lakes.
Figure 2: Distribution of Apparent Color in Wisconsin lakes
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