Long Pond
Orleans County, VermontView mapDirections
Vermont DEC publishes the water-quality measurements for Long Pond. Here is what has been measured.
- Eutrophic
- 17 ft max depth
Long Pond in Orleans County, Vermont has water-quality measurements published by Vermont DEC, shown here as reported. Water clarity: 14.2 ft visibility. Phosphorus: 19.3 µg/L. Chlorophyll-a (algae): 7.2 µg/L.
Long Pond is a productive, nutrient-rich eutrophic lake in Orleans County, Vermont with an estimated average depth of about 17 feet. Overall water quality is improving over recent sampling years. Compared to the 16 other monitored lakes in Orleans County, Long Pond ranks #15 for water quality.
Source: EPA Water Quality Portal sampling records, VT DEC, last sampled 2024-05-20. Methodology: how these readings are compared.
What Long Pond is good for
From access and monitoring records, not editorial picks.
- Clear water14.2 ft of visibility
Swimming conditions
Readings onlyModerate algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Long Pond is safe to swim in today is a call for the Vermont Department of Environmental Conservation and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Long Pond
These are the measurements Vermont DEC publishes for Long Pond, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 14.2 ft. Phosphorus 19.3 µg/L. Chlorophyll-a 7.2 µg/L. TSI 45.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 14.2ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 19.3µg/L | Fair GoodFairPoor |
| Chlorophyll-a (algae) | 7.2µg/L | Fair GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 45 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Long Pond
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~17 ft est.
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Vermont has not published bathymetry for Long Pond.
Lake Size & Watershed
Watershed (drainage) area
4 sq mi
HydroLAKES / HydroSHEDS
Surface area
82 acres
HydroLAKES / HydroSHEDS
Shoreline
1.8 mi
HydroLAKES / HydroSHEDS
Elevation
1,594 ft
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.
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Stays near Long Pond
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Fishing Long Pond
Water quality readings over time
2 seasons of samples on record (2020–2021). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Worsening2 years
Phosphorus
Improving-1.1 µg/L/yr2 years
Chlorophyll-a
Improving-9.4 µg/L/yr2 years
Nearby Lakes in Orleans County
Frequently asked questions about Long Pond
Where is Long Pond?
- Long Pond is a lake in Orleans County, Vermont. Its water-quality measurements are published by Vermont DEC and shown on this page as reported.
What is the water quality of Long Pond?
- Long Pond in Orleans County, Vermont has water-quality measurements published by Vermont DEC, shown here as reported. Water clarity: 14.2 ft visibility. Phosphorus: 19.3 µg/L. Chlorophyll-a (algae): 7.2 µg/L.
Is Long Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Long Pond?
- No published bathymetric survey covers Long Pond, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 17 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Long Pond across LakeQuality
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Where this data comes from
53 measurements from 1 monitoring station, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Vermont Dept of Environmental Conservation
1VTDECWQ53 samples · 2020–2024
Analytical methods
- 4500 P H ~ Manual Digestion and Flow Injection Analysis for Total Phosphorus
- 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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)