Troy Lake Water Data

The following charts and observations have been taken from a static dataset maintained by Steve (Thanks Steve). The charts show phosphorus concentrations, turbidity, and observations over the years when samples were taken for Troy lake.


Note: Charts are interactive, and series data can be removed from each chart by clicking on the month to disable/enable each data series.


The Secchi Disk is a plain white, circular disk 30 cm (12 in) in diameter used to measure water transparency or turbidity in bodies of water. The disc is mounted on a pole or line, and lowered slowly down in the water. The depth at which the disk is no longer visible is taken as a measure of the transparency of the water. This measure is known as the Secchi depth and is related to water turbidity.

The following chart is the measurement of turbidity over the years, shown in negatives for better visualization.

Combined Measurements

Physical Observations

Year Observations
2011 Onset of significant algae bloom following Township draining the beaver pond along the Township road in the Spring
2012 Significant algae bloom is evident again
2013 Still discoloration but not as severe as previous 2 summers
2014 Lake is closer to normal for the summer season. Lake data suggests we are closer to longer term average conditions (still enriched but okay for a shallow spring-fed lake with low turnover)
2015 The positive trends of the past couple years have been sustained.
2016 We are on the right track
2017 We are lower on Phosphorous than the 10 year average-GOOD
2018 Our data is going in the wrong direction again
2019 Significant algae bloom is evident again in August, later confirmed as Blue-Green Algae
2020 A short-lived Blue-Green Algae bloom was evident in early June, water remained green from late June until October. Lowest Phosphorous concentration we have recorded.
2021 Average Phosphorous data does not include August (looks like an error)
2022 Water was green most of the summer, Phosphorous results were lower than recent past
2023 Lake water was relatively clear for our shallow lake