How Clean Is Ann Lake?
Ann 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 ft. Phosphorus: 78.5 µg/L. Trophic State Index: 67.
Cleanliness Snapshot
| Metric | Ann Lake | Minnesota avg |
|---|---|---|
| Overall Grade | D | C |
| Water Clarity (Secchi) | 2 ft | — |
| Phosphorus | 78.5 µg/L | <30 = clean |
| Trophic State Index | 67 | <50 = clean |
How does Ann Lake compare?
Ann Lake's grade of D falls below the Minnesota state average of C. It ranks #5 of 7 lakes in Kanabec County by water quality score. Multi-year monitoring data shows water quality is declining based on 5 years of records.