How Clean Is Lost Lake?
Lost 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): 4.5 ft. Phosphorus: 35.3 µg/L. Trophic State Index: 56.
Cleanliness Snapshot
| Metric | Lost Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | C | C |
| Water Clarity (Secchi) | 4.5 ft | — |
| Phosphorus | 35.3 µg/L | <30 = clean |
| Trophic State Index | 56 | <50 = clean |
How does Lost Lake compare?
Lost Lake's grade of C matches or beats the Wisconsin state average of C. It ranks #167 of 191 lakes in Vilas County by water quality score. Multi-year monitoring data shows water quality is stable based on 6 years of records.