Deep Hole Lake

Deep Hole Lake comes in at a B on the grading rubric — a respectable showing for a Wisconsin lake of its size and depth. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

A TSI near 41 places Deep Hole Lake in the mesotrophic band — moderate productivity, with seasonal swings between clearer spring water and richer late-summer conditions. Deep Hole Lake is a shallow lake at 10 ft maximum depth, which means it warms quickly, mixes constantly, and amplifies nutrient inputs. At 18 acres, Deep Hole Lake sits below the Wisconsin median: a small water where shoreline activity has an outsized effect on water quality. Deep Hole Lake ranks 28 of 32 in Langlade County — at the lower end of the locally monitored distribution.

No invasive species are currently listed at Deep Hole Lake — the lake remains off the Wisconsin infested-waters roster. The lake's fish records list 1 species — a varied community without one dominant gamefish. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.