How Clean Is Big Carnelian Lake?
Big Carnelian 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): 15 ft. Trophic State Index: 38.
Cleanliness Snapshot
| Metric | Big Carnelian Lake | Minnesota avg |
|---|---|---|
| Overall Grade | NR | C |
| Water Clarity (Secchi) | 15 ft | — |
| Trophic State Index | 38 | <50 = clean |
How does Big Carnelian Lake compare?
Big Carnelian 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 declining based on 6 years of records.
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