Jonathan Lake

On the LakeGrade rubric Jonathan Lake fails the cutoffs — a TSI of 74 and persistent algal pressure put it in the bottom tier. The two scored sub-grades — clarity and phosphorus — track close together, so neither one is dragging the average down.

A TSI above 70 puts Jonathan Lake in hypereutrophic territory: visible blooms are common, and clarity rarely climbs even in early summer. 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 31 acres, with partial shoreline records and little volume to buffer nutrient inputs. Within Carver County's 40 graded lakes, Jonathan Lake ranks 26 — below the local median, though not at the bottom.

Jonathan Lake has no invasive species recorded in Minnesota state databases as of 2024, though prevention practices still apply at all access points. The fishery is panfish-dominated — bluegill, crappie, and sunfish among the 3 species documented for the lake. No formal public access is documented at Jonathan Lake — most use is by shoreline residents and their guests. 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.