The key takeaways from the 2020 monitoring season are:
• Allen Lake had fairly high nutrient concentrations, high algal growth, and less-clear water. • Long-term trends suggest that water quality in Allen Lake has generally been improving over time, though there has been considerable variation from year to year. Overall, nitrogen, phosphorus, and chlorophyll concentrations have decreased, and Secchi depths have gotten deeper. • Nitrogen-to-phosphorus (N:P) ratios were below 25 throughout the monitoring season. This indicates the potential for algal blooms to be dominated by cyanobacteria (which have the ability to produce toxins). • No algal blooms were reported for toxin testing in 2020.
Please see below for a link to the full 2020 Allen Lake Monitoring Report.
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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).