Clark Lake

The LakeGrade rubric puts Clark Lake at a C: clarity at 6.8 ft, phosphorus readings still being added, and a TSI of 50 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 50 places Clark 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 Clark Lake in the middle of Minnesota's depth distribution. At 1,162 acres, Clark Lake is one of the larger lakes in Lake County, with 24.2 miles of shoreline supporting multiple distinct use patterns. Clark Lake sits at rank 112 of 159 in Lake County, in the lower half of the local distribution.

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