Big Stone Lake
Roberts County, WisconsinEutrophic
Big Stone Lake is a productive, nutrient-rich eutrophic lake in Roberts County, SD. Water quality is graded F based on 2 sampling years through 2023. Compared to the 1 other monitored lakes in Roberts County, Big Stone Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2023-08-09. Grade methodology: LakeGrade methodology.
Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 3 ft of visibility. Phosphorus level: 108.5 µg/L. Trophic State Index: 67.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3 ft | F |
| Phosphorus | 108.5 µg/L | F |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 67 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Location
County Ranking
Ranked #2 of 2 lakes in Roberts County
Nearby Lakes in Roberts County
More Wisconsin Lake Rankings
Eutrophic Lakes in Wisconsin
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-08-09
Monitoring stations: 2