Agate Lake

Agate Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

A TSI near 43 places Agate Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. A maximum depth of 25 ft puts Agate Lake in the middle of Minnesota's depth distribution. At 187 acres, Agate Lake fits the Minnesota median for monitored lakes, with 2.6 miles of shoreline. Agate Lake sits at rank 84 of 120 in Crow Wing County, in the lower half of the local distribution.

Agate Lake has no invasive species recorded in Minnesota state databases as of 2024, though prevention practices still apply at all access points. The state fisheries records do not list documented species for Agate Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Agate Lake — most use is by shoreline residents and their guests. Ice-out has been recorded 15 times at Agate Lake, with a median around Apr 16. 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.