Lake Runnemede
Windsor County, Vermont63 acresView mapDirections
Nutrients and algae sit mid-range for this region.
↓ down from B at the last regrade
- Mesotrophic
- Impaired · Nuisance exotic species
- #6 of 8 in the county
- 21 ft max depth
Lake Runnemede in Windsor County, Vermont has a water quality grade of C (Fair). Water clarity: 8.2 ft visibility. Phosphorus: 22.9 µg/L. Chlorophyll-a (algae): 4.2 µg/L. Surface area: 63 acres.
- Clarity
- 8.2 ft
- Max depth
- ~21 ft est.
- Area
- 63 acres
- Type
- Mesotrophic
- Phosphorus
- 22.9 µg/L
- Chlorophyll-a
- 4.2 µg/L
- Trend
- → Stable
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Watch Lake Runnemede’s letter
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Lake Runnemede is a 63-acre mesotrophic lake in Windsor County, Vermont with an estimated average depth of about 21 feet. Water quality is graded C based on 2 sampling years through 2025. Phosphorus level is declining over recent sampling years. Compared to the 7 other monitored lakes in Windsor County, Lake Runnemede ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, VT DEC, last sampled 2025-08-13. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyModerate
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 C is nutrients and algae, not a swimming clearance. Lake Runnemede is listed impaired under Clean Water Act §303(d) (IR 4C) for nuisance exotic species. Check local advisories before you swim.
Water Quality Grade: C (Fair)
Moderate clarity, visible to about 8.2 ft. Phosphorus 22.9 µg/L. Chlorophyll-a 4.2 µg/L. TSI 47. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8.2 ft | Not graded |
| Phosphorus | 22.9 µg/L | Fair |
| Chlorophyll-a (Algae) | 4.2 µg/L | Good |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~21 ft est. |
| Average Depth | ~16 ft est. |
| Surface Area | 63 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 Runnemede.
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 Runnemede
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)
Lake Runnemede is a man-made reservoir impounded by the Lake Runnemede (completed 1883), built primarily for recreation on the Connecticut River-Tr; earth-type dam, 15 ft tall and 1,080 ft long.
- Surface area
- 63 ac
- Normal storage
- 0 ac-ft
- Max storage
- 595 ac-ft
- Drainage area
- 0.23 sq mi
- Hazard class
- Significant
- Owner
- TOWN OF WINDSOR
Source: USACE National Inventory of Dams, NID ID VT00229 · Operator website
EPA Impairment Status
Lake Runnemede 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 (2.22 km)
County Ranking
Ranked #6 of 8 lakes in Windsor County
Nearby Lakes in Windsor County
Frequently asked questions about Lake Runnemede
Where is Lake Runnemede?
- Lake Runnemede is a lake in Windsor County, Vermont. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Runnemede?
- Lake Runnemede in Windsor County, Vermont has a water quality grade of C (Fair). Water clarity: 8.2 ft visibility. Phosphorus: 22.9 µg/L. Chlorophyll-a (algae): 4.2 µg/L. Surface area: 63 acres.
Is Lake Runnemede safe to swim in?
- The C is nutrients and algae, not a swimming clearance. Lake Runnemede 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 Runnemede?
- No published bathymetric survey covers Lake Runnemede, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 21 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 63 acres.
Explore Lake Runnemede across LakeQuality
More Vermont Lake Rankings
Other Grade C Lakes in Vermont
Mesotrophic Lakes in Vermont
Where this data comes from
95 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Vermont Dept of Environmental Conservation
1VTDECWQ95 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
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)