Long Lake covers 127 acres and reaches a maximum depth of 46 feet. While it offers recreational value and supports a variety of aquatic life, the lake is currently impaired due to elevated mercury levels in fish tissue, making some fish unsuitable for human or wildlife consumption. Another significant concern is the presence of the invasive species starry stonewort, which poses a threat to native aquatic ecosystems and recreational access. The lake also displays some characteristics of a eutrophic system, including signs of nutrient enrichment.

Recent water quality data show mixed but generally stable trends. Total Phosphorus (TP) levels are slowly declining and remain well below state impairment thresholds. Total Suspended Solids (TSS) are also decreasing and within acceptable limits. Chlorophyll-a (Chl-a) levels meet state standards, and Secchi depth readings indicate good water clarity with low turbidity.

Although Long Lake is in fair ecological health, proactive management is needed—especially to address the spread of starry stonewort and maintain existing water quality conditions. Ongoing monitoring, responsible land use, and community involvement will be essential to protecting and enhancing the lake’s health, ensuring it remains a valued natural and recreational resource for years to come.

For detailed monitoring data and additional information, please follow the links below:

MPCA Surface Water Data

MN DNR Lake Finder