East Devils Lake is a productive, nutrient-rich eutrophic lake in Ramsey County, North Dakota. Water quality is graded C based on 2 sampling years through 2025. Water clarity is declining over recent sampling years. Compared to the 7 other monitored lakes in Ramsey County, East Devils Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, North Dakota DNR, last sampled 2025-10-09. Grade methodology: LakeGrade methodology.
Watch East Devils Lake water quality
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Swimming Safety
Swim with caution, moderate algae may be present
Water Quality Grade: C, Fair
Murky, only visible to about 6.6 ft. Chlorophyll-a: 16.2 µg/L. Trophic State Index: 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.6 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 16.2 µg/L | C |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near East Devils Lake
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Fishing East Devils Lake
Water Quality Trend: → Stable
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.131 m/yr | 5 |
| Chlorophyll-a | ↑ Improving | -1.58 µg/L/yr | 4 |
Water Temperature
East Devils Lake averages about 66°F at the surface in summer, usually warmest in Jul (about 67°F) and coldest in Feb (about 32°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 131 field readings (2010–2025) via the EPA Water Quality Portal. See the full East Devils Lake water temperature breakdown →
Location
County Ranking
Ranked #2 of 8 lakes in Ramsey County
Nearby Lakes in Ramsey County
Explore East Devils Lake across LakeGrade
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Species activity outlook by water temperature and season
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High nutrients, frequent algae, reduced clarity
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Other Grade C Lakes in North Dakota
Eutrophic Lakes in North Dakota
More records, surveys & data sources
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-10-09
Monitoring stations: 1