Agnes Lake

Agnes Lake pulls a D on the LakeGrade rubric — phosphorus loading and limited clarity hold it below the Minnesota average. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

A TSI in the eutrophic range signals a lake doing what nutrient-loaded waters do — supporting an active algal community at the cost of clear water. A maximum depth of 18 ft puts Agnes Lake in the middle of Minnesota's depth distribution. Agnes Lake is small — 29 acres alongside 1.7 miles of shoreline — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Agnes Lake ranks 149 of 187 in St. Louis County — at the lower end of the locally monitored distribution.

Agnes Lake has no invasive species recorded in Minnesota state databases as of 2023, though prevention practices still apply at all access points. 4 fish species are on record, with panfish making up the recreational core. The lake lacks a documented public access point, so visitor use is limited. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.