How Clean Is Prairie Lake?
Prairie 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): 4.8 ft. Trophic State Index: 55.
Cleanliness Snapshot
| Metric | Prairie Lake | Minnesota avg |
|---|---|---|
| Overall Grade | D | C |
| Water Clarity (Secchi) | 4.8 ft | — |
| Trophic State Index | 55 | <50 = clean |
How does Prairie Lake compare?
Prairie Lake's grade of D falls below the Minnesota state average of C. It ranks #158 of 187 lakes in St. Louis County by water quality score. Multi-year monitoring data shows water quality is declining based on 3 years of records.