Lake Mirror is a cold, clear oligotrophic lake in Washington County, Vermont. Water quality is graded A based on 3 sampling years through 2025. Compared to the 16 other monitored lakes in Washington County, Lake Mirror ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, Vermont DNR, last sampled 2025-09-18. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Crystal clear, you can see 21.3 ft down. Phosphorus level: 10.6 µg/L. Chlorophyll-a: 2.6 µg/L. Trophic State Index: 37.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 21.3 ft | A |
| Phosphorus | 10.6 µg/L | A |
| Chlorophyll-a (Algae) | 2.6 µg/L | A |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Lake Mirror
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Fishing Lake Mirror
Location
County Ranking
Ranked #6 of 17 lakes in Washington County
Nearby Lakes in Washington County
Explore Lake Mirror 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: 2025-09-18
Monitoring stations: 2