• Shady Lake has very clear water, with low nutrient concentrations and low algal growth.
• No algal blooms were reported for toxin testing in 2023.
• Shady Lake has contrasting trends in nitrogen and phosphorus concentrations, which is not common. Phosphorus concentrations have increased over time, while nitrogen concentrations have decreased. Additionally, chlorophyll concentrations have decreased over time while Secchi depths have increased (clearer water) indicating improving water quality.
• Investigate potential sources of phosphorus that may be leading to increasing trend.
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).
