Pattagansett Lake
Pattagansett Lake in New London County, Connecticut is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 6.8 ft visibility. Surface area: 120 acres.
- Clarity
- 6.8 ft
- Area
- 120 acres
- Public access
- Yes
Why Pattagansett Lake 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 Pattagansett Lake, 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.
Pattagansett Lake is a 120-acre lake in New London County, Connecticut. Limited fish-species data available. Public access is available with 2 public boat landings.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-09-05. Grade methodology: LakeGrade methodology.
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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 Pattagansett Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Moderate clarity, visible to about 6.8 ft. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.8 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Pattagansett Lake
Compare lakeside cabins, hotels, and vacation rentals near Pattagansett Lake 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 Pattagansett Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 120 acres |
| Public Access | Yes |
No bathymetric survey has been published for Pattagansett Lake, so its depth is not documented here.
Recreation & Access
- Pattagansett LakePublic
- Gorton PondPublic
Named access points from the USGS National Boat Ramps inventory, snapped within 5 km. More lakes with boat ramps
Fishing Pattagansett Lake
Reservoir Info (USACE NID)
Pattagansett Lake is a man-made reservoir impounded by the Pataguanset Lake Dam (completed 1942), built primarily for recreation on the Pataguanset River; earth-type dam, 12 ft tall and 210 ft long.
- Surface area
- 120 ac
- Normal storage
- 310 ac-ft
- Max storage
- 950 ac-ft
- Drainage area
- 3.91 sq mi
- Hazard class
- High
- Owner
- Connecticut DEEP
Source: USACE National Inventory of Dams, NID ID CT00159 · Operator website
Graded lakes near Pattagansett Lake
Pattagansett Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in New London County
Frequently asked questions about Pattagansett Lake
Where is Pattagansett Lake?
- Pattagansett Lake 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 Pattagansett Lake?
- Pattagansett Lake in New London County, Connecticut is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 6.8 ft visibility. Surface area: 120 acres.
Is Pattagansett Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Pattagansett Lake 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 Pattagansett Lake?
- Pattagansett Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Pattagansett Lake, Gorton Pond. Public access is listed as yes.
Explore Pattagansett Lake across LakeGrade
More Connecticut Lake Rankings
Other Lakes in Connecticut
Mesotrophic Lakes in Connecticut
Where this data comes from
123 measurements from 2 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- CT DEEP Volunteer Water Monitoring Program (Volunteer)
CTVOLMON64 samples · 2022–2025 - North American Lake Management Society
NALMS59 samples · 2020–2024
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