Lake Derby is a mesotrophic lake in Orleans County, Vermont. Water quality is graded A based on 2 sampling years through 2024. Compared to the 29 other monitored lakes in Orleans County, Lake Derby ranks #20 for water quality.
Source: EPA Water Quality Portal sampling records, Vermont DNR, last sampled 2024-05-07. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
No clarity data. Phosphorus level: 9.6 µg/L. Chlorophyll-a: 6 µg/L. Trophic State Index: 42.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 9.6 µg/L | A |
| Chlorophyll-a (Algae) | 6 µg/L | B |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lake Derby
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Fishing Lake Derby
Location
County Ranking
Ranked #20 of 30 lakes in Orleans County
Nearby Lakes in Orleans County
Explore Lake Derby across LakeGrade
More Vermont Lake Rankings
Other Grade A Lakes in Vermont
Mesotrophic Lakes in Vermont
More records, surveys & data sources
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-05-07
Monitoring stations: 1