Pachaug Pond
New London County, Connecticut830 acresView mapDirections
CT DEEP publishes the water-quality measurements for Pachaug Pond. Here is what has been measured.
- Limited data
Pachaug Pond in New London County, Connecticut has water-quality measurements published by CT DEEP, shown here as reported. Water clarity: 10.3 ft visibility. Surface area: 830 acres.
Pachaug Pond is a 830-acre lake in New London County, Connecticut.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2021-08-31. Methodology: how these readings are compared.
What Pachaug Pond is good for
From access and monitoring records, not editorial picks.
- Clear water10.3 ft of visibility
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Pachaug 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 Pachaug Pond
These are the measurements CT DEEP publishes for Pachaug Pond, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 10.3 ft. TSI 43.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 10.3ft | 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. | 43 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Pachaug Pond
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
830 acres
No bathymetric survey has been published for Pachaug Pond, so its depth is not documented here.
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Fishing Pachaug Pond
Reservoir Info (USACE NID)
Pachaug Pond is a man-made reservoir impounded by the Pachaug Pond Dam (completed 1888), built primarily for fish and wildlife pond on the Pachaug River; earth-type dam, 17 ft tall and 770 ft long.
- Surface area
- 830 ac
- Normal storage
- 5,982 ac-ft
- Max storage
- 10,962 ac-ft
- Drainage area
- 52.3 sq mi
- Hazard class
- High
- Owner
- Connecticut DEEP
Source: USACE National Inventory of Dams, NID ID CT00663 · Operator website
Nearby Lakes in New London County
Frequently asked questions about Pachaug Pond
Where is Pachaug Pond?
- Pachaug 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 Pachaug Pond?
- Pachaug Pond in New London County, Connecticut has water-quality measurements published by CT DEEP, shown here as reported. Water clarity: 10.3 ft visibility. Surface area: 830 acres.
Is Pachaug Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
3 measurements from 1 monitoring station, 2020–2021. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- North American Lake Management Society
NALMS3 samples · 2020–2021
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.