Williams Pond
Williams Pond in New London County, Connecticut is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 6.4 ft visibility. Surface area: 263 acres.
- Clarity
- 6.4 ft
- Area
- 263 acres
- Public access
- Yes
Why Williams Pond has no grade
We grade a lake only when its monitoring record clears the evidence bar: 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 Williams Pond, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. Sampling here has recorded water clarity, but not phosphorus and algae (chlorophyll-a).
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 your state environmental agency and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Williams Pond is a 263-acre lake in New London County, Connecticut. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-04-28. Grade methodology: LakeGrade methodology.
Watch Williams Pond water quality
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Williams Pond
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Murky, only visible to about 6.4 ft. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.4 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 50 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Williams Pond
Compare lakeside cabins, hotels, and vacation rentals near Williams Pond in New London County, Connecticut — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Williams Pond
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 263 acres |
| Public Access | Yes |
No bathymetric survey has been published for Williams Pond, so its depth is not documented here.
Recreation & Access
- Mono PondPublic
Named access points from the USGS National Boat Ramps inventory, snapped within 5 km. More lakes with boat ramps
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
Graded lakes near Williams Pond
Williams Pond has no grade, but these lakes within a short drive do.
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. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Williams Pond?
- Williams Pond in New London County, Connecticut is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 6.4 ft visibility. Surface area: 263 acres.
Is Williams Pond safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Williams Pond is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Are there boat ramps on Williams Pond?
- Williams Pond has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Mono Pond. Public access is listed as yes.
Explore Williams Pond across LakeGrade
More Connecticut Lake Rankings
Other Lakes in Connecticut
Eutrophic Lakes in Connecticut
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)
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
Named boat-access points from the USGS National Boat Ramps inventory