Lake Greenwood
Washington County, VermontView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Mesotrophic
- #5 of 9 in the county
- 54 ft max depth
- Public access
Lake Greenwood in Washington County, Vermont has a water quality grade of A (Excellent). Water clarity: 18 ft visibility. Phosphorus: 11.1 µg/L. Chlorophyll-a (algae): 3.3 µg/L.
- Clarity
- 18 ft
- Max depth
- ~54 ft est.
- Type
- Mesotrophic
- Phosphorus
- 11.1 µg/L
- Chlorophyll-a
- 3.3 µg/L
- Trend
- ↓ Declining
- Public access
- Yes
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Watch Lake Greenwood’s letter
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Lake Greenwood is a mesotrophic lake in Washington County, Vermont with an estimated average depth of about 54 feet. Water quality is graded A based on 2 sampling years through 2025. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available. Compared to the 8 other monitored lakes in Washington County, Lake Greenwood ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, VT DEC, last sampled 2025-08-12. Grade methodology: LakeQuality methodology.
What Lake Greenwood is good for
From access and monitoring records, not editorial picks.
- Clear water18 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 18 ft down. Phosphorus 11.1 µg/L. Chlorophyll-a 3.3 µg/L. TSI 39. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 18 ft | Not graded |
| Phosphorus | 11.1 µg/L | Good |
| Chlorophyll-a (Algae) | 3.3 µg/L | Good |
| Trophic State Index (TSI) | 39 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~54 ft est. |
| Average Depth | ~22 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 Lake Greenwood.
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 Lake Greenwood
Water Quality Trend: ↓ Declining
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.167 m/yr | 6 |
| Phosphorus | ↓ Declining | +0.28 µg/L/yr | 6 |
| Chlorophyll-a | ↑ Improving | -0.38 µg/L/yr | 6 |
County Ranking
Ranked #5 of 9 lakes in Washington County
Nearby Lakes in Washington County
Frequently asked questions about Lake Greenwood
Where is Lake Greenwood?
- Lake Greenwood is a lake in Washington County, Vermont. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Greenwood?
- Lake Greenwood in Washington County, Vermont has a water quality grade of A (Excellent). Water clarity: 18 ft visibility. Phosphorus: 11.1 µg/L. Chlorophyll-a (algae): 3.3 µg/L.
Is Lake Greenwood safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
How deep is Lake Greenwood?
- No published bathymetric survey covers Lake Greenwood, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 54 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Lake Greenwood across LakeQuality
More Vermont Lake Rankings
Other Grade A Lakes in Vermont
Mesotrophic Lakes in Vermont
Where this data comes from
172 measurements from 3 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Vermont Dept of Environmental Conservation
1VTDECWQ172 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 (3)
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)