Vergennes Watershed Lake
Addison County, Vermont15 acresView 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.
- Impaired · Nuisance exotic species
- Limited data
Vergennes Watershed Lake in Addison County, Vermont is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 15 acres.
- Area
- 15 acres
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Watch Vergennes Watershed Lake’s letter
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Why Vergennes Watershed 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 Vergennes Watershed Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
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.
Vergennes Watershed Lake is a 15-acre lake in Addison County, Vermont.
Source: EPA Water Quality Portal sampling records, VT DEC, last sampled 2021-04-09. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Vergennes Watershed Lake is listed impaired under Clean Water Act §303(d) (IR 4C) for nuisance exotic species. Check local advisories before you swim.
Water quality measurements for Vergennes Watershed Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples |
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 15 acres |
No bathymetric survey has been published for Vergennes Watershed Lake, so its depth is not documented here.
Fishing Vergennes Watershed Lake
Reservoir Info (USACE NID)
Vergennes Watershed Lake is a man-made reservoir impounded by the Norton Brook (completed 1935), built primarily for recreation on the Little Otter Creek-Tr; earth-type dam, 36 ft tall and 354 ft long.
- Surface area
- 15 ac
- Normal storage
- 0 ac-ft
- Max storage
- 233 ac-ft
- Drainage area
- 0.16 sq mi
- Hazard class
- Significant
- Owner
- WATERSHED CENTER
Source: USACE National Inventory of Dams, NID ID VT00102 · Operator website
EPA Impairment Status
Vergennes Watershed Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4C).
Causes of impairment
Source: EPA ATTAINS assessment unit VT03-07L01 · Official waterbody report
Graded lakes near Vergennes Watershed Lake
Vergennes Watershed Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Addison County
Frequently asked questions about Vergennes Watershed Lake
Where is Vergennes Watershed Lake?
- Vergennes Watershed 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 Vergennes Watershed Lake?
- Vergennes Watershed Lake in Addison County, Vermont is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 15 acres.
Is Vergennes Watershed Lake safe to swim in?
- The letter is not a swimming clearance. Vergennes Watershed Lake is listed impaired under Clean Water Act §303(d) (IR 4C) for nuisance exotic species. Check local advisories before you swim.
Explore Vergennes Watershed Lake across LakeQuality
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Where this data comes from
5 measurements from 1 monitoring station, 2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Vermont Dept of Environmental Conservation
1VTDECWQ5 samples · 2021
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 (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
Impairment status from EPA ATTAINS 303(d) database