How Clean Is Nelson Lake?
Nelson Lake has fair water quality — typical of lakes with moderate nutrient enrichment. It received a water quality grade of C (Fair) based on EPA monitoring data. Water clarity (Secchi depth): 1.3 ft. Phosphorus: 275 µg/L. Chlorophyll-a (algae): 23.1 µg/L. Trophic State Index: 73.
Cleanliness Snapshot
| Metric | Nelson Lake | North Dakota avg |
|---|---|---|
| Overall Grade | C | C |
| Water Clarity (Secchi) | 1.3 ft | — |
| Phosphorus | 275 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 23.1 µg/L | <10 = clean |
| Trophic State Index | 73 | <50 = clean |
How does Nelson Lake compare?
Nelson Lake's grade of C matches or beats the North Dakota state average of C. It ranks #2 of 3 lakes in Oliver County by water quality score.
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