South Pond
Lamoille County, Vermont109 acresView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Mesotrophic
- #1 of 6 in the county
- 40 ft max depth
South Pond in Lamoille County, Vermont has a water quality grade of A (Excellent). Water clarity: 15.4 ft visibility. Phosphorus: 8.2 µg/L. Chlorophyll-a (algae): 2.3 µg/L. Surface area: 109 acres.
- Clarity
- 15.4 ft
- Max depth
- ~40 ft est.
- Area
- 109 acres
- Type
- Mesotrophic
- Phosphorus
- 8.2 µg/L
- Chlorophyll-a
- 2.3 µg/L
- Trend
- ↑ Improving
Stays via Stay22
Stays near South Pond
Compare lakeside cabins, hotels, and vacation rentals near South Pond in Lamoille 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 South Pond
Prices for Sep 11–13, 4 adults. Change dates on the map below.
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 whole trip? See where to stay at Vermont’s top lakes →
Watch South Pond’s letter
Email me if this lake’s grade moves. Grades stay free.
Or email
South Pond is a 109-acre mesotrophic lake in Lamoille County, Vermont with an estimated average depth of about 40 feet. Water quality is graded A based on 2 sampling years through 2025. Overall water quality is improving over recent sampling years. Compared to the 5 other monitored lakes in Lamoille County, South Pond ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, VT DEC, last sampled 2025-09-01. Grade methodology: LakeQuality methodology.
What South Pond is good for
From access and monitoring records, not editorial picks.
- Clear water15.4 ft of visibility
Swimming Safety
Grade onlyLow algae
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: A (Excellent)
Crystal clear, you can see 15.4 ft down. Phosphorus 8.2 µg/L. Chlorophyll-a 2.3 µg/L. TSI 37. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 15.4 ft | Not graded |
| Phosphorus | 8.2 µg/L | Good |
| Chlorophyll-a (Algae) | 2.3 µg/L | Good |
| Trophic State Index (TSI) | 37 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~40 ft est. |
| Average Depth | ~18 ft est. |
| Surface Area | 109 acres |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Vermont has not published bathymetry for South Pond.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Fishing South Pond
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.45 m/yr | 5 |
| Phosphorus | ↑ Improving | -0.78 µg/L/yr | 5 |
| Chlorophyll-a | ↑ Improving | -0.44 µg/L/yr | 5 |
Reservoir Info (USACE NID)
South Pond is a man-made reservoir impounded by the South Pond (completed 1922), built primarily for recreation on the Gihon River-Tr; earth-type dam, 38 ft tall and 115 ft long.
- Surface area
- 109 ac
- Normal storage
- 0 ac-ft
- Max storage
- 3,300 ac-ft
- Drainage area
- 2.16 sq mi
- Hazard class
- Significant
- Owner
- SOUTH POND LAND OWNERS ASSOC.
Source: USACE National Inventory of Dams, NID ID VT00197 · Operator website
County Ranking
Ranked #1 of 6 lakes in Lamoille County
Nearby Lakes in Lamoille County
Frequently asked questions about South Pond
Where is South Pond?
- South Pond is a lake in Lamoille County, Vermont. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for South Pond?
- South Pond in Lamoille County, Vermont has a water quality grade of A (Excellent). Water clarity: 15.4 ft visibility. Phosphorus: 8.2 µg/L. Chlorophyll-a (algae): 2.3 µg/L. Surface area: 109 acres.
Is South Pond safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
How deep is South Pond?
- No published bathymetric survey covers South Pond, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 40 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 109 acres.
Explore South Pond across LakeQuality
More Vermont Lake Rankings
Other Grade A Lakes in Vermont
Mesotrophic Lakes in Vermont
Where this data comes from
117 measurements from 2 monitoring stations, 2021–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Vermont Dept of Environmental Conservation
1VTDECWQ117 samples · 2021–2025
Analytical methods
- EPA approved Alternate Test Procedure for 4500 P H. Has a 28 day hold without acid preservation.
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- 2130 B ~ Nephelometric Method
Monitoring station identifiers (2)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)