Lake Raponda
Windham County, VermontView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Mesotrophic
- #1 of 9 in the county
Lake Raponda in Windham County, Vermont has a water quality grade of A (Excellent). Water clarity: 11.3 ft visibility. Phosphorus: 10.1 µg/L. Chlorophyll-a (algae): 2.4 µg/L.
- Clarity
- 11.3 ft
- Type
- Mesotrophic
- Phosphorus
- 10.1 µg/L
- Chlorophyll-a
- 2.4 µg/L
- Trend
- ↑ Improving
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Stays near Lake Raponda
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Watch Lake Raponda’s letter
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Lake Raponda is a mesotrophic lake in Windham County, Vermont. Water quality is graded A based on 2 sampling years through 2025. Overall water quality is improving over recent sampling years. Compared to the 8 other monitored lakes in Windham County, Lake Raponda ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, VT DEC, last sampled 2025-08-27. Grade methodology: LakeQuality methodology.
What Lake Raponda is good for
From access and monitoring records, not editorial picks.
- Clear water11.3 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)
Good clarity, visible to about 11.3 ft. Phosphorus 10.1 µg/L. Chlorophyll-a 2.4 µg/L. TSI 40. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11.3 ft | Not graded |
| Phosphorus | 10.1 µg/L | Good |
| Chlorophyll-a (Algae) | 2.4 µg/L | Good |
| Trophic State Index (TSI) | 40 | Mesotrophic |
Moderate nutrients, good water quality
Fishing Lake Raponda
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.11 m/yr | 4 |
| Phosphorus | ↑ Improving | -0.43 µg/L/yr | 6 |
| Chlorophyll-a | ↑ Improving | -0.42 µg/L/yr | 6 |
County Ranking
Ranked #1 of 9 lakes in Windham County
Nearby Lakes in Windham County
Frequently asked questions about Lake Raponda
Where is Lake Raponda?
- Lake Raponda 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 Lake Raponda?
- Lake Raponda in Windham County, Vermont has a water quality grade of A (Excellent). Water clarity: 11.3 ft visibility. Phosphorus: 10.1 µg/L. Chlorophyll-a (algae): 2.4 µg/L.
Is Lake Raponda safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Lake Raponda across LakeQuality
More Vermont Lake Rankings
Other Grade A Lakes in Vermont
Mesotrophic Lakes in Vermont
Where this data comes from
140 measurements from 2 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Vermont Dept of Environmental Conservation
1VTDECWQ140 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 (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.