How Clean Is Johnson Lake?
Johnson 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): 1.6 ft. Phosphorus: 96 µg/L. Trophic State Index: 70.
Cleanliness Snapshot
| Metric | Johnson Lake | Minnesota avg |
|---|---|---|
| Overall Grade | F | C |
| Water Clarity (Secchi) | 1.6 ft | — |
| Phosphorus | 96 µg/L | <30 = clean |
| Trophic State Index | 70 | <50 = clean |
How does Johnson Lake compare?
Johnson Lake's grade of F falls below the Minnesota state average of C. It ranks #28 of 35 lakes in Kandiyohi County by water quality score.