How Clean Is Scotch Lake?
Scotch 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): 4.1 ft. Phosphorus: 569 µg/L. Chlorophyll-a (algae): 9.7 µg/L. Trophic State Index: 68.
Cleanliness Snapshot
| Metric | Scotch Lake | Minnesota avg |
|---|---|---|
| Overall Grade | D | C |
| Water Clarity (Secchi) | 4.1 ft | — |
| Phosphorus | 569 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 9.7 µg/L | <10 = clean |
| Trophic State Index | 68 | <50 = clean |
How does Scotch Lake compare?
Scotch Lake's grade of D falls below the Minnesota state average of C. It ranks #5 of 14 lakes in Le Sueur County by water quality score. Multi-year monitoring data shows water quality is improving based on 2 years of records.