Mill Pond
Windsor County, Vermont70 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
- 27 ft max depth
- Limited data
Mill Pond in Windsor County, Vermont is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 70 acres.
- Max depth
- ~27 ft est.
- Area
- 70 acres
- Trend
- → Stable
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Watch Mill Pond’s letter
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Why Mill Pond 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 Mill Pond, 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.
Mill Pond is a 70-acre lake in Windsor County, Vermont with an estimated average depth of about 27 feet. Phosphorus level is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, VT DEC, last sampled 2024-04-29. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Mill Pond 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 Mill Pond
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 |
|---|---|
| Maximum Depth | ~27 ft est. |
| Average Depth | ~15 ft est. |
| Surface Area | 70 acres |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Vermont has not published bathymetry for Mill 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 Mill Pond
Water Quality Trend: → Stable
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.021 m/yr | 3 |
| Phosphorus | ↓ Declining | +1 µg/L/yr | 5 |
| Chlorophyll-a | ↑ Improving | -0.28 µg/L/yr | 5 |
Reservoir Info (USACE NID)
Mill Pond is a man-made reservoir impounded by the Windsor Upper (completed 1834), built primarily for recreation on the Mill Brook; gravity-type dam, 55 ft tall and 320 ft long.
- Surface area
- 70 ac
- Normal storage
- 0 ac-ft
- Max storage
- 645 ac-ft
- Drainage area
- 43.86 sq mi
- Hazard class
- High
- Owner
- TOWN OF WINDSOR
Source: USACE National Inventory of Dams, NID ID VT00013 · Operator website
EPA Impairment Status
Mill Pond 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 VT13-08L01_02 · Official waterbody report · Matched by proximity (0.88 km)
Graded lakes near Mill Pond
Mill Pond has no grade, but these lakes within a short drive do.
Nearby Lakes in Windsor County
Frequently asked questions about Mill Pond
Where is Mill Pond?
- Mill Pond is a lake in Windsor 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 Mill Pond?
- Mill Pond in Windsor County, Vermont is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 70 acres.
Is Mill Pond safe to swim in?
- The letter is not a swimming clearance. Mill Pond is listed impaired under Clean Water Act §303(d) (IR 4C) for nuisance exotic species. Check local advisories before you swim.
How deep is Mill Pond?
- No published bathymetric survey covers Mill Pond, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 27 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 70 acres.
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Where this data comes from
4 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Vermont Dept of Environmental Conservation
1VTDECWQ4 samples · 2024
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
Lake size & watershed from HydroLAKES (HydroSHEDS)