Long Pond
Orleans County, VermontView mapDirections
Nutrients and algae sit mid-range for this region.
↓ down from B at the last regrade
- Eutrophic
- #15 of 17 in the county
- 17 ft max depth
Long Pond in Orleans County, Vermont has a water quality grade of C (Fair). Water clarity: 14.2 ft visibility. Phosphorus: 19.3 µg/L. Chlorophyll-a (algae): 7.2 µg/L.
- Clarity
- 14.2 ft
- Max depth
- ~17 ft est.
- Type
- Eutrophic
- Phosphorus
- 19.3 µg/L
- Chlorophyll-a
- 7.2 µg/L
- Trend
- ↑ Improving
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Watch Long Pond’s letter
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Long Pond is a productive, nutrient-rich eutrophic lake in Orleans County, Vermont with an estimated average depth of about 17 feet. Water quality is graded C based on 2 sampling years through 2024. 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. Grade methodology: LakeQuality methodology.
What Long Pond is good for
From access and monitoring records, not editorial picks.
- Clear water14.2 ft of visibility
Swimming Safety
Grade onlyModerate
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 C is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: C (Fair)
Good clarity, visible to about 14.2 ft. Phosphorus 19.3 µg/L. Chlorophyll-a 7.2 µg/L. TSI 45. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14.2 ft | Not graded |
| Phosphorus | 19.3 µg/L | Fair |
| Chlorophyll-a (Algae) | 7.2 µg/L | Fair |
| Trophic State Index (TSI) | 45 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~17 ft est. |
| Average Depth | ~14 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
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 Long Pond
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.35 m/yr | 2 |
| Phosphorus | ↑ Improving | -1.1 µg/L/yr | 2 |
| Chlorophyll-a | ↑ Improving | -9.4 µg/L/yr | 2 |
County Ranking
Ranked #15 of 17 lakes in Orleans County
Nearby Lakes With Higher Grades
Long Pond holds Grade C. 3 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Orleans County
Frequently asked questions about Long Pond
Where is Long Pond?
- Long Pond is a lake in Orleans County, Vermont. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Long Pond?
- Long Pond in Orleans County, Vermont has a water quality grade of C (Fair). 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?
- The C is nutrients and algae, 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
More Vermont Lake Rankings
Other Grade C Lakes in Vermont
Eutrophic Lakes in Vermont
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)
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)