Monitoring the water quality of Cayuga Lake has continued periodically from the early 1900s to the present. The Seneca County Soil and Water Conservation District (SCSWCD) has collected limnological data on the waters of the northern end of Cayuga Lake since 1991. This report updates the 1999 report (1991 to 1998) (Makarewicz et al. 1999) with data taken by the SCSWCD from 1999 to 2006. By considering nutrient and chlorophyll a concentrations and water clarity measurements, we reviewed the current data from Cayuga Lake with historical measurements of the lake.