Fern Lake is a mesotrophic lake in Addison County, Vermont. Water quality is graded A based on 3 sampling years through 2025. Compared to the 12 other monitored lakes in Addison County, Fern Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Vermont DNR, last sampled 2025-08-23. Grade methodology: LakeGrade methodology.
Watch Fern Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Crystal clear, you can see 20.7 ft down. Phosphorus level: 19 µg/L. Chlorophyll-a: 5.3 µg/L. Trophic State Index: 42.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 20.7 ft | A |
| Phosphorus | 19 µg/L | A |
| Chlorophyll-a (Algae) | 5.3 µg/L | B |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Fern Lake
Compare lakeside cabins, hotels, and vacation rentals near Fern Lake in Addison County, Vermont — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Fern Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Fern Lake?
Get lake water-quality report cards plus the best cabin & lodging deals near Fern Lake — straight to your inbox. No spam, unsubscribe anytime.
Fishing Fern Lake
Location
County Ranking
Ranked #3 of 13 lakes in Addison County
Nearby Lakes in Addison County
Explore Fern Lake 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: 2025-08-23
Monitoring stations: 2