How Clean Is Sleepy Eye Lake?
Sleepy Eye 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): 3.3 ft. Phosphorus: 39.5 µg/L. Chlorophyll-a (algae): 41.7 µg/L. Trophic State Index: 61.
Cleanliness Snapshot
| Metric | Sleepy Eye Lake | Minnesota avg |
|---|---|---|
| Overall Grade | D | C |
| Water Clarity (Secchi) | 3.3 ft | — |
| Phosphorus | 39.5 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 41.7 µg/L | <10 = clean |
| Trophic State Index | 61 | <50 = clean |
How does Sleepy Eye Lake compare?
Sleepy Eye Lake's grade of D falls below the Minnesota state average of C. It ranks #2 of 7 lakes in Brown County by water quality score. Multi-year monitoring data shows water quality is declining based on 4 years of records.