How Clean Is Hannen Lake?
Hannen Lake has very poor water quality and a high algae bloom risk. It received a water quality grade of F (Very Poor) based on EPA monitoring data. Water clarity (Secchi depth): 1.2 ft. Chlorophyll-a (algae): 119.9 µg/L. Trophic State Index: 76.
Cleanliness Snapshot
| Metric | Hannen Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | F | D |
| Water Clarity (Secchi) | 1.2 ft | — |
| Chlorophyll-a (Algae) | 119.9 µg/L | <10 = clean |
| Trophic State Index | 76 | <50 = clean |
How does Hannen Lake compare?
Hannen Lake's grade of F falls below the Wisconsin state average of D. It ranks #1 of 2 lakes in Benton County by water quality score.