Androscoggin Lake

Through our water quality monitoring program, we collect extensive data to track the health of our lakes and ponds. We measure water clarity, temperature, dissolved oxygen, phosphorus and other indicators of water quality. This data helps us identify trends in declining water quality to address at-risk areas before it's too late.

Androscoggin Lake Reports & Resources:

Note: This page updates throughout our monitoring season. Annual water quality reports will be available after the season is completed.

Androscoggin Lake Snapshot

Secchi Depth

Secchi depth readings measure transparency by recording the level at which a black-and-white disk disappears from sight as it is lowered beneath the surface of the lake. See our water quality monitoring page for more information.

Temperature and Dissolved Oxygen

These readings are obtained as an electronic sensor measures temperature (in degrees Celsius) and dissolved oxygen (in mg/L or ppm) as it is lowered at one meter intervals starting at the surface of the lake. After 15 meters readings are taken every other meter. For more information about temperature and dissolved oxygen in lakes and why this information is important, see our water quality monitoring page for more information.

2023 Temperature and Dissolved Oxygen readings:

2022 Temperature and Dissolved Oxygen readings:

Total Phosphorus

Phosphorus is the nutrient that most influences the growth of algae in lakes. Because its natural occurrence in lakes is very small, phosphorus “limits” the growth of algae in lake ecosystems. Even very small increases in phosphorus in lake water can cause substantial increases in algal growth.

Generally speaking, in-lake phosphorus concentrations (epilimnetic core samples) less than 10-12 ppb are ideal. Lakes with in-lake phosphorus concentrations of 13 ppb or more are known to sustain algal blooms, and blooms become frequent as average annual concentrations approach 20 ppb.

Thank you to all of the volunteers who help us collect this data!

View data from other lakes & ponds in the Watershed: