How Clean Is Long Lake?
Long Lake is among the cleanest lakes in Minnesota. It received a water quality grade of A (Excellent) based on EPA monitoring data. Water clarity (Secchi depth): 11.2 ft. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 4.5 µg/L. Trophic State Index: 42.
Cleanliness Snapshot
| Metric | Long Lake | Minnesota avg |
|---|---|---|
| Overall Grade | A | C |
| Water Clarity (Secchi) | 11.2 ft | — |
| Phosphorus | 10 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 4.5 µg/L | <10 = clean |
| Trophic State Index | 42 | <50 = clean |
How does Long Lake compare?
Long Lake's grade of A matches or beats the Minnesota state average of C. It ranks #1 of 68 lakes in Hubbard County by water quality score. Multi-year monitoring data shows water quality is improving based on 6 years of records.
Watch Long Lake water quality
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