• Angle Lake continued to have clear water, with low nutrient concentrations and low algal growth.
• Angle Lake continues to be one of the clearest lakes in the Lake Stewardship Program.
• No algal blooms were reported for toxin testing in 2023.
• Chlorophyll and total nitrogen concentrations have decreased over time in Angle Lake and Secchi depths have gotten deeper, suggesting that water quality has been improving slightly. Although the chlorophyll change per decade of 0.24 µg/L would be insignificant in many lakes, it is several percent of Angle Lake’s average chlorophyll concentration.
• Investigate potential causes that could be contributing to water quality improvements.
This bathymetric map shows contour lines of equal depth, similar to a topographic map would for mountains and valleys. The red 'X' marks the location where water quality samples are taken.
This map shows the area of the watershed relative to the area of the lake. Generally speaking, the larger a watershed is relative to a lake, the greater the influence land use practices on lake water quality.
The average of these three TSI indicators during the growing season can be used
to place lakes in one of three broad categories:
<40 = oligotrophic (low productivity),
40 to 50 = mesotrophic (moderate productivity)
>50 = eutrophic (highly productive).
