How Clean Is Pony Express Lake?
Pony Express Lake has poor water quality, with elevated phosphorus and algae. It received a water quality grade of D (Poor) based on EPA monitoring data. Water clarity (Secchi depth): 1.3 ft. Phosphorus: 53.2 µg/L. Chlorophyll-a (algae): 26.3 µg/L. Trophic State Index: 66.
Cleanliness Snapshot
| Metric | Pony Express Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | D | C |
| Water Clarity (Secchi) | 1.3 ft | — |
| Phosphorus | 53.2 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 26.3 µg/L | <10 = clean |
| Trophic State Index | 66 | <50 = clean |
How does Pony Express Lake compare?
Pony Express Lake's grade of D falls below the Wisconsin state average of C. It ranks #1 of 6 lakes in DeKalb County by water quality score.