How Clean Is Orwell Lake?
Orwell Lake does not have enough monitoring data to grade. It does not have enough recent summer sampling for a letter grade, so it is shown unrated. Unrated means the measurements are missing, not that the water is poor. Everything the monitoring record does contain is below. Water clarity (Secchi depth): 4.1 ft. Phosphorus: 54 µg/L. Chlorophyll-a (algae): 9.7 µg/L. Trophic State Index: 57.
Cleanliness Snapshot
| Metric | Orwell Lake | Minnesota avg |
|---|---|---|
| Overall Grade | NR | C |
| Water Clarity (Secchi) | 4.1 ft | — |
| Phosphorus | 54 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 9.7 µg/L | <10 = clean |
| Trophic State Index | 57 | <50 = clean |
How does Orwell Lake compare?
Orwell Lake is not rated for water quality: it does not have enough recent summer sampling for a letter grade, so it is not compared with the Minnesota state average. Multi-year monitoring data shows water quality is declining based on 2 years of records.
Watch Orwell Lake water quality
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