Murdock Lake

Murdock Lake sits at a C on the grading scale — not impaired, not pristine, with summer measurements that vary year to year. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

At a TSI of 54, Murdock Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake is compact at 15 acres, with partial shoreline records and little volume to buffer nutrient inputs. Within Polk County's 74 graded lakes, Murdock Lake ranks 47 — below the local median, though not at the bottom.

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