Tahkodah Lake

On the LakeGrade scale Tahkodah Lake grades a B, with clarity at 9.5 ft and 14 µg/L of phosphorus placing it above the Wisconsin median. Secchi readings are the weakest of the scored parameters, suggesting suspended sediment or algal biomass dominates the optical signal.

Mesotrophic conditions dominate at Tahkodah Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. 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. Within Bayfield County's 52 graded lakes, Tahkodah Lake ranks 35 — below the local median, though not at the bottom.

Tahkodah Lake has no invasive species recorded in Wisconsin state databases as of 2025, though prevention practices still apply at all access points. The state fisheries records do not list documented species for Tahkodah Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.