Milwaukee Harbor Lake

On the scoring rubric Milwaukee Harbor Lake grades a D: clarity at 6.6 ft and phosphorus readings still being added keep it in the lower bracket for Milwaukee County. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. 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. Milwaukee Harbor Lake ranks 15 of 15 in Milwaukee County — at the lower end of the locally monitored distribution.

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