Long Pond
New London County, Connecticut99 acresView mapDirections
CT DEEP publishes the water-quality measurements for Long Pond. Here is what has been measured.
- Oligotrophic
- Public access
- Limited data
Long Pond in New London County, Connecticut has water-quality measurements published by CT DEEP, shown here as reported. Phosphorus: 12 µg/L. Chlorophyll-a (algae): 1.5 µg/L. Surface area: 99 acres.
Long Pond is a 99-acre cold, clear oligotrophic lake in New London County, Connecticut. Limited fish-species data available. Public access is available with 1 public boat landing. 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. Methodology: how these readings are compared.
What Long Pond is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Long 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 Long Pond
These are the measurements CT DEEP publishes for Long Pond, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 12 µg/L. Chlorophyll-a 1.5 µg/L. TSI 37.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 12µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 1.5µg/L | Measured, not scored 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. | 37 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Long Pond
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
99 acres
Public access
Yes
Listed by CT DEEP
No bathymetric survey has been published for Long Pond, so its depth is not documented here.
Recreation & Access
- Long PondPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
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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
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. Its water-quality measurements are published by CT DEEP and shown on this page as reported.
What is the water quality of Long Pond?
- Long Pond in New London County, Connecticut has water-quality measurements published by CT DEEP, shown here as reported. Phosphorus: 12 µg/L. Chlorophyll-a (algae): 1.5 µg/L. Surface area: 99 acres.
Is Long Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Long Pond?
- Long Pond has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Long Pond. Public access is listed as yes.
Can I fish at Long Pond?
- Long Pond has 1 documented boat landing in the USGS National Boat Ramps inventory. 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.
Explore Long Pond across LakeQuality
More lakes in Connecticut
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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)
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.
Other records on this page
Named boat-access points from the USGS National Boat Ramps inventory