How Clean Is Long Lake?
Long Lake has poor water quality, with elevated phosphorus and algae. It received a water quality grade of D (Poor) based on EPA monitoring data. Water clarity (Secchi depth): 2.8 ft. Phosphorus: 47.5 µg/L. Chlorophyll-a (algae): 26 µg/L. Trophic State Index: 62.
Cleanliness Snapshot
| Metric | Long Lake | Minnesota avg |
|---|---|---|
| Overall Grade | D | C |
| Water Clarity (Secchi) | 2.8 ft | — |
| Phosphorus | 47.5 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 26 µg/L | <10 = clean |
| Trophic State Index | 62 | <50 = clean |
How does Long Lake compare?
Long Lake's grade of D falls below the Minnesota state average of C. It ranks #63 of 83 lakes in Washington County by water quality score.