Culbertson Springs Lake

Culbertson Springs Lake sits at the top of the Wisconsin DNR grading rubric with an A, a mark reached by the cleanest lakes in Wisconsin. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

Trophically, Culbertson Springs Lake reads as oligotrophic — nutrient-poor, clear, and ecologically more sensitive to disturbance than richer lakes. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. At 1 acres, Culbertson Springs Lake sits below the Wisconsin median: a small water where shoreline activity has an outsized effect on water quality. Among the 70 graded lakes in Burnett County, Culbertson Springs Lake sits at rank 33, above the county median.

No invasive species are currently listed at Culbertson Springs Lake — the lake remains off the Wisconsin infested-waters roster. 2 fish species are documented at Culbertson Springs Lake, a mixed warm-water community typical for Wisconsin lakes of this size. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.