Smith Lake

Smith Lake sits at the top of the Wisconsin DNR grading rubric with an A, a mark reached by the cleanest lakes in Wisconsin.

A TSI near 44 places Smith Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. Smith Lake is a shallow lake at 11 ft maximum depth, which means it warms quickly, mixes constantly, and amplifies nutrient inputs. The lake is compact at 20 acres, with partial shoreline records and little volume to buffer nutrient inputs. Smith Lake ranks 6 of 21 in Marinette County — solidly in the upper half of the local distribution.

No invasive species are currently listed at Smith Lake — the lake remains off the Wisconsin infested-waters roster. The state fisheries records do not list documented species for Smith Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.