Lake Sirena

Lake Sirena is a sandy bottomed, naturally clear 'ridge' type lake located just south of the town of Lake Placid.  Based on Lakewatch data, water quality in Lake Sirena is good for a lake of this type.  Phosphorus levels are consistently low, ranging from 3 to 9 ppb (parts per billion) and averaging 6 ppb.  Nitrogen levels are low to average for a ridge lake, ranging from 300 to 670 ppb and averaging only 448 ppb.  Algae populations, as estimated by the concentration of chlorophyll in the water, increase and decrease as nutrient levels increase and decrease .  Chlorophyll levels range from a very low 2 to 6 ppb and average only 3 ppb, indicating that the lake is not 'cloudy' due to the presence of algae which can reduce water clarity.  Water clarity, as measured by the depth to which a standardized 'secchi' disc can be seen when lowered into the water, is good for a ridge type lake. Secchi depths range from 9 to 17.5 feet and average over 13 feet, making lake Sirena among the clearest lakes in the county.  Water quality fluctuates as expected in this lake and there does not appear to be a significant change in water quality since Lakewatch sampling began in 1994.  It should be noted that no samples were taken From July 2000 through June 2002.  However, the few data available for 2002 and 2003 are consistent with previous data, suggesting that the lake appears to be in the same condition now as in previous years.  Click here to view water quality data by year.

Lakewatch water quality data through 1999