Average Trophic Status Index (TSI) All Lakes 1990-2014

The Trophic State Index (TSI) is estimated by using water quality measurements and a mathematical formula (Carlson, 1977). TSI numbers are calculated using three different lake measurements: water transparency, and phosphorus levels, and chlorophyll-a.  Chlorophyll-a is the green pigment that algae use to capture the energy of the sun. It is used as an indication