How Clean Is Spirit River Flowage Lake?
Spirit River Flowage Lake has fair water quality — typical of lakes with moderate nutrient enrichment. It received a water quality grade of C (Fair) based on EPA monitoring data. Water clarity (Secchi depth): 6.6 ft. Phosphorus: 49.1 µg/L. Trophic State Index: 55.
Cleanliness Snapshot
| Metric | Spirit River Flowage Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | C | B |
| Water Clarity (Secchi) | 6.6 ft | — |
| Phosphorus | 49.1 µg/L | <30 = clean |
| Trophic State Index | 55 | <50 = clean |
How does Spirit River Flowage Lake compare?
Spirit River Flowage Lake's grade of C falls below the Wisconsin state average of B. It ranks #20 of 21 lakes in Lincoln County by water quality score. Multi-year monitoring data shows water quality is improving based on 7 years of records.