A new web-based map service offers insight into lake clarity. Measured from satellite with calibration provided by hundreds of citizen volunteers, the University of Wisconsin-Madison’s Environmental Remote Sensing Center’s “LakeSat” lets you compare lake clarity across a region or zoom into a particular lake.
In addition to the interactive map, you can also download a large-format poster (in PDF) of the entire state for printing.
More information: LakeSat web page