How Clean Is Lost Valley Lake?
Lost Valley 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): 3.9 ft. Phosphorus: 22.7 µg/L. Chlorophyll-a (algae): 7.2 µg/L. Trophic State Index: 52.
Cleanliness Snapshot
| Metric | Lost Valley Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | C | C |
| Water Clarity (Secchi) | 3.9 ft | — |
| Phosphorus | 22.7 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 7.2 µg/L | <10 = clean |
| Trophic State Index | 52 | <50 = clean |
How does Lost Valley Lake compare?
Lost Valley Lake's grade of C matches or beats the Wisconsin state average of C. It ranks #2 of 4 lakes in Gasconade County by water quality score.