How Clean Is Jo Shelby Lake?
Jo Shelby 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. Phosphorus: 48 µg/L. Chlorophyll-a (algae): 15 µg/L. Trophic State Index: 59.
Cleanliness Snapshot
| Metric | Jo Shelby Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | C | C |
| Phosphorus | 48 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 15 µg/L | <10 = clean |
| Trophic State Index | 59 | <50 = clean |
How does Jo Shelby Lake compare?
Jo Shelby Lake's grade of C matches or beats the Wisconsin state average of C. It ranks #2 of 4 lakes in Linn County by water quality score.