We have examined the water quality of the Lake Kamo over a 4-year period from August 1997 to August 2001 at 17 observation sites that were set up at 250-m intervals along a N-S line in the lake. Measurements on water temperature, salinity, density, transparency, dissolved oxygen and pH were made at all the observation sites for every depth interval of 50 cm. Thus the data were obtained from a total of 180 measurement points during the entire study period, except on certain stormy days. The data were analyzed and the results are summarized.