How Clean Is Long Lake?
Long Lake does not have enough monitoring data to grade. Its EPA monitoring record does not meet the evidence bar for a letter grade, so it is published unrated — that is an absence of evidence, not a poor result. The measurements below are what the record does contain. Water clarity (Secchi depth): 10.8 ft. Trophic State Index: 43.
Cleanliness Snapshot
| Metric | Long Lake | Minnesota avg |
|---|---|---|
| Overall Grade | C | |
| Water Clarity (Secchi) | 10.8 ft | — |
| Trophic State Index | 43 | <50 = clean |
How does Long Lake compare?
Long Lake is not rated for water quality — its monitoring record does not meet the evidence bar, so it is not compared with the Minnesota state average. Multi-year monitoring data shows water quality is stable based on 5 years of records.