Big Doctor Lake

On the LakeGrade scale Big Doctor Lake grades a B, with clarity at 13.9 ft and phosphorus readings still being added placing it above the Wisconsin median. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

A TSI value of 39 puts Big Doctor Lake in the oligotrophic range, where biological productivity stays low and the water column remains clear. 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. Big Doctor Lake ranks 61 of 70 in Burnett County — at the lower end of the locally monitored distribution.

No invasive species are currently listed at Big Doctor Lake — the lake remains off the Wisconsin infested-waters roster. The state fisheries records do not list documented species for Big Doctor 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.