How Clean Is Smith Lake?
Smith Lake has very poor water quality and a high algae bloom risk. It received a water quality grade of F (Very Poor) based on EPA monitoring data. Water clarity (Secchi depth): 3.6 ft. Phosphorus: 58 µg/L. Chlorophyll-a (algae): 36 µg/L. Trophic State Index: 62.
Cleanliness Snapshot
| Metric | Smith Lake | Minnesota avg |
|---|---|---|
| Overall Grade | F | C |
| Water Clarity (Secchi) | 3.6 ft | — |
| Phosphorus | 58 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 36 µg/L | <10 = clean |
| Trophic State Index | 62 | <50 = clean |
How does Smith Lake compare?
Smith Lake's grade of F falls below the Minnesota state average of C. It ranks #36 of 37 lakes in Douglas County by water quality score. Multi-year monitoring data shows water quality is declining based on 6 years of records.