Lake Memphremagog is a mesotrophic lake in Orleans County, Vermont. Water quality is graded B based on 3 sampling years through 2025. Compared to the 29 other monitored lakes in Orleans County, Lake Memphremagog ranks #21 for water quality.
Source: EPA Water Quality Portal sampling records, Vermont DNR, last sampled 2025-08-19. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 10.5 ft. Phosphorus level: 14.1 µg/L. Chlorophyll-a: 5.5 µg/L. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.5 ft | B |
| Phosphorus | 14.1 µg/L | A |
| Chlorophyll-a (Algae) | 5.5 µg/L | B |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lake Memphremagog
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Fishing Lake Memphremagog
Location
County Ranking
Ranked #21 of 30 lakes in Orleans County
Cleaner Lakes Within 30 Miles
Lake Memphremagog holds Grade B. 3 nearby lakes hold higher grades.
- ASeymour LakeOrleans County · 12.9 mi · Higher grade (B → A)
- ALake SalemOrleans County · 6.8 mi · Higher grade (B → A)
- ALake DerbyOrleans County · 9.4 mi · Higher grade (B → A)
Nearby Lakes in Orleans County
Explore Lake Memphremagog across LakeGrade
More Vermont Lake Rankings
Other Grade B 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: 2025-08-19
Monitoring stations: 4