Long Pond
Long Pond in New London County, Connecticut has a water quality grade of B (Good). Phosphorus: 12 µg/L. Chlorophyll-a (algae): 1.5 µg/L. Surface area: 99 acres.
- Area
- 99 acres
- Type
- Oligotrophic
- Public access
- Yes
Long Pond is a 99-acre cold, clear oligotrophic lake in New London County, Connecticut. Water quality is graded B based on 2 sampling years through 2024. Limited fish-species data available. Public access is available with 2 public boat landings. Compared to the 9 other monitored lakes in New London County, Long Pond ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-07-16. Grade methodology: LakeGrade methodology.
Watch Long Pond water quality
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Swimming Safety
Grade onlyLimited data
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.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
No clarity data. Phosphorus level: 12 µg/L. Chlorophyll-a: 1.5 µg/L. Trophic State Index: 37.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 12 µg/L | Good |
| Chlorophyll-a (Algae) | 1.5 µg/L | Not graded |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Long Pond
Compare lakeside cabins, hotels, and vacation rentals near Long 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 Long Pond
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 99 acres |
| Public Access | Yes |
No bathymetric survey has been published for Long Pond, so its depth is not documented here.
Recreation & Access
- Lantern HillPublic
- Long PondPublic
Named access points from the USGS National Boat Ramps inventory, snapped within 5 km. More lakes with boat ramps
Fishing Long Pond
Reservoir Info (USACE NID)
Long Pond is a man-made reservoir impounded by the Long Pond Dam (completed 1880), built primarily for recreation on the Whitford Brook; earth-type dam, 6 ft tall and 200 ft long.
- Surface area
- 99 ac
- Normal storage
- 297 ac-ft
- Drainage area
- 4.62 sq mi
- Hazard class
- Significant
- Owner
- Lantern Hill Valley Association
Source: USACE National Inventory of Dams, NID ID CT00527 · Operator website
County Ranking
Ranked #2 of 10 lakes in New London County
Nearby Lakes in New London County
Frequently asked questions about Long Pond
Where is Long Pond?
- Long Pond is a lake in New London County, Connecticut. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Long Pond?
- Long Pond in New London County, Connecticut has a water quality grade of B (Good). Phosphorus: 12 µg/L. Chlorophyll-a (algae): 1.5 µg/L. Surface area: 99 acres.
Is Long Pond safe to swim in?
- Good for swimming, clear water with low algae levels. Long Pond has a water quality grade of B (Good). Algae concentration (chlorophyll-a) is 1.5 µg/L. Always check local health department advisories before swimming.
Are there boat ramps on Long Pond?
- Long Pond has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Lantern Hill, Long Pond. Public access is listed as yes.
Explore Long Pond across LakeGrade
More Connecticut Lake Rankings
Other Grade B Lakes in Connecticut
Oligotrophic Lakes in Connecticut
Where this data comes from
24 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- Connecticut Department Of Energy And Environmental Protection
CT_DEP01_WQX24 samples · 2024
Analytical methods
- Total Phosphorus After Block Digestion
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- Nitrate-Nitrite Nitrogen by Colorimetry
- Turbidity by Nephelometry
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
Named boat-access points from the USGS National Boat Ramps inventory