How Clean Is St. Croix 0.3 Mi. Downstream of I Lake?
St. Croix 0.3 Mi. Downstream of I Lake has fair water quality — typical of lakes with moderate nutrient enrichment. It received a water quality grade of C (Fair) based on EPA monitoring data. Water clarity (Secchi depth): 6.1 ft. Phosphorus: 34 µg/L. Trophic State Index: 53.
Cleanliness Snapshot
| Metric | St. Croix 0.3 Mi. Downstream of I Lake | Minnesota avg |
|---|---|---|
| Overall Grade | C | C |
| Water Clarity (Secchi) | 6.1 ft | — |
| Phosphorus | 34 µg/L | <30 = clean |
| Trophic State Index | 53 | <50 = clean |
How does St. Croix 0.3 Mi. Downstream of I Lake compare?
St. Croix 0.3 Mi. Downstream of I Lake's grade of C matches or beats the Minnesota state average of C. It ranks #26 of 31 lakes in Washington County by water quality score. Multi-year monitoring data shows water quality is stable based on 5 years of records.