How Clean Is Long Trade Lake?
Long Trade 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 ft. Phosphorus: 87.6 µg/L. Trophic State Index: 65.
Cleanliness Snapshot
| Metric | Long Trade Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | D | C |
| Water Clarity (Secchi) | 3 ft | — |
| Phosphorus | 87.6 µg/L | <30 = clean |
| Trophic State Index | 65 | <50 = clean |
How does Long Trade Lake compare?
Long Trade Lake's grade of D falls below the Wisconsin state average of C. It ranks #67 of 73 lakes in Polk County by water quality score. Multi-year monitoring data shows water quality is improving based on 6 years of records.