How Clean Is Three Mile Lake?
Three Mile Lake is nutrient-rich, with elevated phosphorus and algae. It received a water quality grade of D (Nutrient-rich) based on EPA monitoring data. Water clarity (Secchi depth): 2.7 ft. Phosphorus: 43 µg/L. Chlorophyll-a (algae): 28.4 µg/L. Trophic State Index: 62.
Cleanliness Snapshot
| Metric | Three Mile Lake | Iowa avg |
|---|---|---|
| Overall Grade | D | D |
| Water Clarity (Secchi) | 2.7 ft | — |
| Phosphorus | 43 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 28.4 µg/L | <10 = clean |
| Trophic State Index | 62 | <50 = clean |
How does Three Mile Lake compare?
Three Mile Lake's grade of D matches or beats the Iowa state average of D. It ranks #1 of 6 lakes in Union County by water quality score. Multi-year monitoring data shows water quality is improving based on 5 years of records.
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