Extent of available data.
Data Source:MN Pollution Control Agency, Natural Resources Research Institute
Tags:Lakes, Water Quality
This data layer indicates lake chlorophyll-a levels. It was developed by the Natural Resources Research Institute using data from the Minnesota Pollution Control Agency. Chlorophyll-a is the green pigment that is found in plants and algae. Concentrations were calculated using the 10 year average for samples collected from May through September. The average is recalculated annually. Because all algal cells contain this pigment, its concentration provides an estimate of algal biomass. Both chlorophyll and secchi depth are long-accepted methods for estimating the amount of algae in lakes. The concentration of total phosphorus, chlorophyll and Secchi depth are the three components used to assess lake trophic status or health.