South Pond
Windham County, VermontView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Mesotrophic
- Impaired · pH / acidity
- #3 of 9 in the county
- 26 ft max depth
- Public access
- Limited data
South Pond in Windham County, Vermont has a water quality grade of A (Excellent). Water clarity: 14.8 ft visibility. Phosphorus: 13.1 µg/L. Chlorophyll-a (algae): 2.9 µg/L.
- Clarity
- 14.8 ft
- Max depth
- ~26 ft est.
- Type
- Mesotrophic
- Phosphorus
- 13.1 µg/L
- Chlorophyll-a
- 2.9 µg/L
- Trend
- ↑ Improving
- Public access
- Yes
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Watch South Pond’s letter
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South Pond is a mesotrophic lake in Windham County, Vermont with an estimated average depth of about 26 feet. Water quality is graded A based on 1 sampling years through 2025. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 8 other monitored lakes in Windham County, South Pond ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, VT DEC, last sampled 2025-07-22. Grade methodology: LakeQuality methodology.
What South Pond is good for
From access and monitoring records, not editorial picks.
- Clear water14.8 ft of visibility
- Boat launch1 documented ramp
Swimming Safety
Grade onlyLimited data
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. South Pond is listed impaired under Clean Water Act §303(d) (IR 4A) for pH / acidity. Check local advisories before you swim.
Water Quality Grade: A (Excellent)
Good clarity, visible to about 14.8 ft. Phosphorus 13.1 µg/L. Chlorophyll-a 2.9 µg/L. TSI 40. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14.8 ft | Not graded |
| Phosphorus | 13.1 µg/L | Not graded |
| Chlorophyll-a (Algae) | 2.9 µg/L | Good |
| Trophic State Index (TSI) | 40 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~26 ft est. |
| Average Depth | ~20 ft est. |
| Public Access | Yes |
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.
Recreation & Access
- South PondPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing South Pond
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.26 m/yr | 4 |
EPA Impairment Status
South Pond is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit VT12-07L01 · Official waterbody report · Matched by proximity (0.12 km)
County Ranking
Ranked #3 of 9 lakes in Windham County
Nearby Lakes in Windham County
Frequently asked questions about South Pond
Where is South Pond?
- South Pond is a lake in Windham 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 Windham County, Vermont has a water quality grade of A (Excellent). Water clarity: 14.8 ft visibility. Phosphorus: 13.1 µg/L. Chlorophyll-a (algae): 2.9 µg/L.
Is South Pond safe to swim in?
- The A is nutrients and algae, not a swimming clearance. South Pond is listed impaired under Clean Water Act §303(d) (IR 4A) for pH / acidity. 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 26 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Are there boat ramps on South Pond?
- South Pond has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include South Pond. Public access is listed as yes.
Explore South Pond across LakeQuality
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Mesotrophic Lakes in Vermont
Where this data comes from
51 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Vermont Dept of Environmental Conservation
1VTDECWQ51 samples · 2020–2025
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 (1)
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
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory