How Clean Is Roosevelt Lake?
Roosevelt 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): 11.1 ft. Phosphorus: 12.5 µg/L. Chlorophyll-a (algae): 3.6 µg/L. Trophic State Index: 42.
Cleanliness Snapshot
| Metric | Roosevelt Lake | Minnesota avg |
|---|---|---|
| Overall Grade | A | C |
| Water Clarity (Secchi) | 11.1 ft | — |
| Phosphorus | 12.5 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 3.6 µg/L | <10 = clean |
| Trophic State Index | 42 | <50 = clean |
How does Roosevelt Lake compare?
Roosevelt Lake's grade of A matches or beats the Minnesota state average of C. It ranks #30 of 104 lakes in Cass County by water quality score. Multi-year monitoring data shows water quality is improving based on 6 years of records.
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