Greenwood Lake

Greenwood Lake sits at a C on the grading scale — not impaired, not pristine, with summer measurements that vary year to year. Secchi readings are the weakest of the three parameters, suggesting suspended sediment or algal biomass dominates the optical signal.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. Greenwood Lake is a shallow lake at 7 ft maximum depth, which means it warms quickly, mixes constantly, and amplifies nutrient inputs. Greenwood Lake covers 1,329 acres alongside 11.0 miles of shoreline, large enough that conditions can vary meaningfully between bays. Within the 159 graded lakes of Lake County, Greenwood Lake sits at rank 134, near the bottom of the county list.

Greenwood Lake has no invasive species recorded in Minnesota state databases as of 2025, though prevention practices still apply at all access points. Walleye are documented at Greenwood Lake, one of 7 fish species on record for the lake. A documented public access point at Greenwood Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. 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.