How Clean Is Black Hawk Lake?
Black Hawk Lake is a clean lake by Wisconsin standards. It received a water quality grade of B (Good) based on EPA monitoring data. Water clarity (Secchi depth): 5 ft. Phosphorus: 19.9 µg/L. Trophic State Index: 51.
Cleanliness Snapshot
| Metric | Black Hawk Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | B | C |
| Water Clarity (Secchi) | 5 ft | — |
| Phosphorus | 19.9 µg/L | <30 = clean |
| Trophic State Index | 51 | <50 = clean |
How does Black Hawk Lake compare?
Black Hawk Lake's grade of B matches or beats the Wisconsin state average of C. It ranks #1 of 6 lakes in Iowa County by water quality score. Multi-year monitoring data shows water quality is declining based on 6 years of records.