How Clean Is French Lake?
French Lake is algae-prone, with a higher bloom risk in warm months. It received a water quality grade of F (Algae-prone) based on EPA monitoring data. Water clarity (Secchi depth): 1.7 ft. Phosphorus: 134 µg/L. Chlorophyll-a (algae): 46.3 µg/L. Trophic State Index: 71.
Cleanliness Snapshot
| Metric | French Lake | Minnesota avg |
|---|---|---|
| Overall Grade | F | C |
| Water Clarity (Secchi) | 1.7 ft | — |
| Phosphorus | 134 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 46.3 µg/L | <10 = clean |
| Trophic State Index | 71 | <50 = clean |
How does French Lake compare?
French Lake's grade of F falls below the Minnesota state average of C. It ranks #9 of 14 lakes in Rice County by water quality score. Multi-year monitoring data shows water quality is improving based on 2 years of records.