How Clean Is Grindstone Lake?
Grindstone Lake is among the cleanest lakes in Wisconsin. Its nutrient and algae readings come from EPA monitoring data. Water clarity (Secchi depth): 17.4 ft. Phosphorus: 15 µg/L. Chlorophyll-a (algae): 1.4 µg/L. Trophic State Index: 38.
Cleanliness Snapshot
| Metric | Grindstone Lake | Wisconsin avg |
|---|---|---|
| Water Clarity (Secchi) | 17.4 ft | — |
| Phosphorus | 15 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 1.4 µg/L | <10 = clean |
| Trophic State Index | 38 | <50 = clean |
How does Grindstone Lake compare?
Grindstone Lake's readings match or beat the Wisconsin state average. It ranks #12 of 45 lakes in Sawyer County on nutrient and algae readings. Multi-year monitoring data shows water quality is stable based on 5 years of records.
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