Diamond Lake
Diamond Lake covers 1,552 acres with a maximum depth of 27 feet. Once valued for its recreational appeal and clear waters, the lake is now considered impaired due to nutrient enrichment and declining water quality. It currently exhibits symptoms of a eutrophic waterbody—characterized by high nutrient levels, fluctuating clarity, and weakened overall health.
Long-term monitoring shows concerning trends. While Total Phosphorus (TP) levels show a slight decline, they still suggest instability. Total Suspended Solids (TSS) are increasing, likely linked to runoff and erosion. Chlorophyll-a (Chl-a), an indicator of algae presence, frequently exceeds state standards, and Secchi depth readings show wide fluctuations, signaling rising turbidity and reduced clarity.
These indicators reflect a weakened aquatic ecosystem that is vulnerable to further degradation if left unmanaged. The surrounding landscape—forests, wetlands, agricultural fields, and developed areas—significantly affects water quality. As water moves through the watershed, it carries sediments, nutrients, and pollutants into the lake, compounding the issue.
Despite these challenges, positive change is possible. By continuing to monitor water quality at multiple locations within the lake, adopting sustainable and responsible land management practices, and fostering strong public engagement, the community can help reverse current trends. With collective action, Diamond Lake has the potential to recover and become a healthy, thriving ecosystem once again.
For more information and detailed data, click the links below:
MPCA Surface Water Quality Data