Twin Lake North

On the LakeGrade rubric, Twin Lake North pulls an A: clarity at 32.8 ft and phosphorus readings still being added put it in the top bracket for Wisconsin. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

A TSI value of 27 puts Twin Lake North in the oligotrophic range, where biological productivity stays low and the water column remains clear. Twin Lake North reaches 25 ft at its deepest point — typical for Wisconsin mid-sized lakes, with seasonal stratification but limited cold-water refuge. The lake is compact at 52 acres, with partial shoreline records and little volume to buffer nutrient inputs. Within Bayfield County's 55 graded lakes, Twin Lake North ranks 28 — below the local median, though not at the bottom.

No invasive species are currently listed at Twin Lake North — the lake remains off the Wisconsin infested-waters roster. The fishery is bass-led, with 3 documented species across the lake's records. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.