Third Lake

On the scoring rubric Third Lake grades a D: clarity at 5.5 ft and phosphorus readings still being added keep it in the lower bracket for Chisago County.

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. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake's surface area is not consistently recorded across state datasets — physical context remains partial. Third Lake ranks 24 of 31 in Chisago County — at the lower end of the locally monitored distribution.

No invasive species are currently listed at Third Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Third Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Third 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.