Lake Pinneo
Windsor County, Vermont50 acresView mapDirections
Not Rated: two monitoring stations are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- Impaired · Nuisance exotic species
- 17 ft max depth
- Limited data
Lake Pinneo in Windsor County, Vermont is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 7.5 ft visibility. Surface area: 50 acres.
- Clarity
- 7.5 ft
- Max depth
- ~17 ft est.
- Area
- 50 acres
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Stays near Lake Pinneo
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Watch Lake Pinneo’s letter
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Why Lake Pinneo has no grade
Lake Pinneo has monitoring on record from two stations, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Lake Pinneo is Not Rated — not an F. Its 7.5-foot median from 6 readings collected 2020–2022 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. 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.
Lake Pinneo is a 50-acre lake in Windsor County, Vermont with an estimated average depth of about 17 feet.
Source: EPA Water Quality Portal sampling records, VT DEC, last sampled 2022-04-20. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Lake Pinneo 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 Lake Pinneo
These readings exist but are not enough for an A–F grade — see why.
Moderate clarity, visible to about 7.5 ft. TSI 48.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.5 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 48 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~17 ft est. |
| Average Depth | ~14 ft est. |
| Surface Area | 50 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 Lake Pinneo.
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 Pinneo
Reservoir Info (USACE NID)
Lake Pinneo is a man-made reservoir impounded by the Lake Pinneo (completed 1975), built primarily for recreation on the Ottauquechee River-Tr; earth-type dam, 10 ft tall and 6,500 ft long.
- Surface area
- 50 ac
- Normal storage
- 0 ac-ft
- Max storage
- 430 ac-ft
- Drainage area
- 0.08 sq mi
- Hazard class
- Low
- Owner
- QUECHEE LAKES LANDOWNERS
Source: USACE National Inventory of Dams, NID ID VT00258 · Operator website
EPA Impairment Status
Lake Pinneo 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 VT10-02L03 · Official waterbody report
Graded lakes near Lake Pinneo
Lake Pinneo has no grade, but these lakes within a short drive do.
Nearby Lakes in Windsor County
Frequently asked questions about Lake Pinneo
Where is Lake Pinneo?
- Lake Pinneo 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 Lake Pinneo?
- Lake Pinneo in Windsor County, Vermont is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 7.5 ft visibility. Surface area: 50 acres.
Is Lake Pinneo safe to swim in?
- The letter is not a swimming clearance. Lake Pinneo is listed impaired under Clean Water Act §303(d) (IR 4C) for nuisance exotic species. Check local advisories before you swim.
How deep is Lake Pinneo?
- No published bathymetric survey covers Lake Pinneo, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 17 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 50 acres.
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Where this data comes from
6 measurements from 2 monitoring stations, 2020–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Vermont Dept of Environmental Conservation
1VTDECWQ6 samples · 2020–2022
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)