How Clean Is Gull Lake?
Gull 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): 15 ft. Phosphorus: 13.5 µg/L. Chlorophyll-a (algae): 3 µg/L. Trophic State Index: 40.
Cleanliness Snapshot
| Metric | Gull Lake | Minnesota avg |
|---|---|---|
| Overall Grade | A | C |
| Water Clarity (Secchi) | 15 ft | — |
| Phosphorus | 13.5 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 3 µg/L | <10 = clean |
| Trophic State Index | 40 | <50 = clean |
How does Gull Lake compare?
Gull Lake's grade of A matches or beats the Minnesota state average of C. It ranks #20 of 104 lakes in Cass County by water quality score.
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