St. Croix 3.5 Mi. Downstream of E Chestnut St Lake

St. Croix 3.5 Mi. Downstream of E Chestnut St Lake sits at a C on the grading scale — not impaired, not pristine, with summer measurements that vary year to year. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

A TSI in the eutrophic range signals a lake doing what nutrient-loaded waters do — supporting an active algal community at the cost of clear water. At 78 ft of maximum depth, St. Croix 3.5 Mi. Downstream of E Chestnut St Lake stratifies reliably through the summer — the hypolimnion stays cooler and clearer than the surface layer suggests. At 8,393 acres, St. Croix 3.5 Mi. Downstream of E Chestnut St Lake is one of the larger lakes in Washington County, with 124.5 miles of shoreline supporting multiple distinct use patterns. Within the 31 graded lakes of Washington County, St. Croix 3.5 Mi. Downstream of E Chestnut St Lake sits at rank 25, near the bottom of the county list.

Eurasian watermilfoil is established at St. Croix 3.5 Mi. Downstream of E Chestnut St Lake, which can dampen recreational access and pressure the native plant community. Muskie are on the species list at St. Croix 3.5 Mi. Downstream of E Chestnut St Lake, alongside the lake's 36 other documented fish. No formal public access is documented at St. Croix 3.5 Mi. Downstream of E Chestnut St 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.