L. Champlain Lake
Addison County, VermontView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Public access
- Limited data
L. Champlain Lake in Addison County, Vermont is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 26.1 µg/L. Chlorophyll-a (algae): 4 µg/L.
- Phosphorus
- 26.1 µg/L
- Chlorophyll-a
- 4 µg/L
- Public access
- Yes
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Watch L. Champlain Lake’s letter
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Why L. Champlain Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For L. Champlain Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus and algae (chlorophyll-a), but not water clarity.
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by VT DEC and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
L. Champlain Lake is a lake in Addison County, Vermont. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, VT DEC, last sampled 2025-08-21. Grade methodology: LakeQuality methodology.
What L. Champlain Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for L. Champlain Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 26.1 µg/L. Chlorophyll-a 4 µg/L. TSI 48.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 26.1 µg/L | Not graded |
| Chlorophyll-a (Algae) | 4 µg/L | Not graded |
| Trophic State Index (TSI) | 48 | Mesotrophic |
Moderate nutrients, good water quality
Recreation & Access
- WestportPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing L. Champlain Lake
Graded lakes near L. Champlain Lake
L. Champlain Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Addison County
Frequently asked questions about L. Champlain Lake
Where is L. Champlain Lake?
- L. Champlain Lake is a lake in Addison County, Vermont. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for L. Champlain Lake?
- L. Champlain Lake in Addison County, Vermont is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 26.1 µg/L. Chlorophyll-a (algae): 4 µg/L.
Is L. Champlain Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on L. Champlain Lake?
- L. Champlain Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Westport. Public access is listed as yes.
Explore L. Champlain Lake across LakeQuality
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Where this data comes from
4 measurements from 1 monitoring station, 2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Vermont Dept of Environmental Conservation
1VTDECWQ4 samples · 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
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
Named boat-access points from the USGS National Boat Ramps inventory