Williams Pond
New London County, Connecticut263 acresView mapDirections
CT DEEP publishes the water-quality measurements for Williams Pond. Here is what has been measured.
- Public access
- Limited data
Williams Pond in New London County, Connecticut has water-quality measurements published by CT DEEP, shown here as reported. Water clarity: 6.4 ft visibility. Surface area: 263 acres.
Williams Pond is a 263-acre lake in New London County, Connecticut. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-04-28. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Williams Pond is safe to swim in today is a call for the Connecticut Department of Energy and Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Williams Pond
These are the measurements CT DEEP publishes for Williams Pond, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 6.4 ft. TSI 50.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 6.4ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 50 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Williams Pond
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
263 acres
Public access
Yes
Listed by CT DEEP
No bathymetric survey has been published for Williams Pond, so its depth is not documented here.
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Fishing Williams Pond
Reservoir Info (USACE NID)
Williams Pond is a man-made reservoir impounded by the Williams Pond Dam (completed 1865), built primarily for recreation on the Bartlett Brook; earth-type dam, 26 ft tall and 792 ft long.
- Surface area
- 263 ac
- Normal storage
- 3,520 ac-ft
- Max storage
- 3,993 ac-ft
- Drainage area
- 3.12 sq mi
- Hazard class
- Significant
- Owner
- Town of Lebanon
Source: USACE National Inventory of Dams, NID ID CT00551 · Operator website
Nearby Lakes in New London County
Frequently asked questions about Williams Pond
Where is Williams Pond?
- Williams Pond is a lake in New London County, Connecticut. Its water-quality measurements are published by CT DEEP and shown on this page as reported.
What is the water quality of Williams Pond?
- Williams Pond in New London County, Connecticut has water-quality measurements published by CT DEEP, shown here as reported. Water clarity: 6.4 ft visibility. Surface area: 263 acres.
Is Williams Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Can I fish at Williams Pond?
- Public access to Williams Pond is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Connecticut's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
31 measurements from 2 monitoring stations, 2021–2024. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- North American Lake Management Society
NALMS25 samples · 2021–2022 - CT DEEP Volunteer Water Monitoring Program (Volunteer)
CTVOLMON6 samples · 2022–2024
Monitoring station identifiers (2)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.