Annie Lake

The LakeGrade rubric puts Annie Lake at a C: clarity at 9.0 ft, phosphorus readings still being added, and a TSI of 45 signal an intermediate trophic state. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

A TSI near 45 places Annie Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. Annie Lake reaches 16 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. At 19 acres, Annie Lake sits below the Minnesota median: a small water where shoreline activity has an outsized effect on water quality. Within the 142 graded lakes of Lake County, Annie Lake sits at rank 109, near the bottom of the county list.

No invasive species are currently listed at Annie Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Annie Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Annie Lake — most use is by shoreline residents and their guests. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.