How Clean Is Upper Maple Lake?
Upper Maple Lake is among the cleanest lakes in Minnesota. It received a water quality grade of A (Excellent) based on EPA monitoring data. Water clarity (Secchi depth): 18 ft. Phosphorus: 16 µg/L. Trophic State Index: 40.
Cleanliness Snapshot
| Metric | Upper Maple Lake | Minnesota avg |
|---|---|---|
| Overall Grade | A | C |
| Water Clarity (Secchi) | 18 ft | — |
| Phosphorus | 16 µg/L | <30 = clean |
| Trophic State Index | 40 | <50 = clean |
How does Upper Maple Lake compare?
Upper Maple Lake's grade of A matches or beats the Minnesota state average of C. It ranks #2 of 64 lakes in Wright County by water quality score. Multi-year monitoring data shows water quality is declining based on 5 years of records.