Devils Lake
Benson County, WisconsinEutrophic
Devils Lake is a productive, nutrient-rich eutrophic lake in Benson County, ND. Water quality is graded C based on 2 sampling years through 2025. Compared to the 3 other monitored lakes in Benson County, Devils Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2025-10-09. Grade methodology: LakeGrade methodology.
Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Murky, only visible to about 3.7 ft. Chlorophyll-a: 13.9 µg/L. Trophic State Index: 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.7 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 13.9 µg/L | C |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Location
County Ranking
Ranked #4 of 4 lakes in Benson County
Nearby Lakes in Benson County
More Wisconsin Lake Rankings
Other Grade C Lakes in Wisconsin
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: 2025-10-09
Monitoring stations: 2