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Decorah Lake
Decorah Lake was monitored by volunteers between 2007 and 2021. Volunteers monitor water clarity with a black and white Secchi disk. Volunteers are the source of the majority of Wisconsin's lake water quality data, and their dedication is greatly appreciated. Reports and graphs featuring data collected by volunteers, DNR staff and others can be viewed below.
Water Quality Reports and Graphs
| Station Name | Station ID | Map | Max Year | Reports |
|---|
| Decorah Lake - Decorah Lake | 294006 | Map | 1979 | Details |
| Decorah Lake - Decorah Lake | 293073 | Map | 1993 | Details |
| Decorah Lake - Deep Hole | 293152 | Map | 2004 | Details |
| Decorah Lake - Deep Hole Above Dam | 293155 | Map | 2021 | Details |