How Clean Is Spirit Lake?
Spirit 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): 1.3 ft. Phosphorus: 59.5 µg/L. Chlorophyll-a (algae): 1.5 µg/L. Trophic State Index: 57.
Cleanliness Snapshot
| Metric | Spirit Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | C | B |
| Water Clarity (Secchi) | 1.3 ft | — |
| Phosphorus | 59.5 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 1.5 µg/L | <10 = clean |
| Trophic State Index | 57 | <50 = clean |
How does Spirit Lake compare?
Spirit Lake's grade of C falls below the Wisconsin state average of B. It ranks #9 of 15 lakes in Douglas County by water quality score.