Green River Reservoir is a cold, clear oligotrophic lake in Lamoille County, Vermont. Water quality is graded A based on 3 sampling years through 2025. Compared to the 9 other monitored lakes in Lamoille County, Green River Reservoir ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, Vermont DNR, last sampled 2025-08-18. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Good clarity, visible to about 13.1 ft. Phosphorus level: 7.4 µg/L. Chlorophyll-a: 1.4 µg/L. Trophic State Index: 36.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13.1 ft | B |
| Phosphorus | 7.4 µg/L | A |
| Chlorophyll-a (Algae) | 1.4 µg/L | A |
| Trophic State Index (TSI) | 36 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Green River Reservoir
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Fishing Green River Reservoir
Location
County Ranking
Ranked #4 of 10 lakes in Lamoille County
Nearby Lakes in Lamoille County
Explore Green River Reservoir across LakeGrade
More Vermont Lake Rankings
Other Grade A Lakes in Vermont
Oligotrophic 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: 2025-08-18
Monitoring stations: 1