Agate Lake

Agate Lake carries a solid B grade — strong on most parameters, with measurements that hold up well across the summer season.

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. Agate Lake reaches 25 ft at its deepest point — typical for Minnesota mid-sized lakes, with seasonal stratification but limited cold-water refuge. The lake's 187 acres and 2.6 miles of shoreline put it in the mid-range bucket — large enough for varied use, small enough that watershed inputs reach the whole basin. Within Crow Wing County's 120 graded lakes, Agate Lake ranks 84 — below the local median, though not at the bottom.

No invasive species are currently listed at Agate Lake — the lake remains off the Minnesota infested-waters roster. 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. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.