Halls Pond
Windham County, Connecticut82 acresView mapDirections
CT DEEP publishes the water-quality measurements for Halls Pond. Here is what has been measured.
- Limited data
Halls Pond in Windham County, Connecticut has water-quality measurements published by CT DEEP, shown here as reported. Water clarity: 8.1 ft visibility. Surface area: 82 acres.
Halls Pond is a 82-acre lake in Windham County, Connecticut.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2020-07-19. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Halls 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 Halls Pond
These are the measurements CT DEEP publishes for Halls Pond, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 8.1 ft. TSI 47.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 8.1ft | 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. | 47 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Halls Pond
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
82 acres
No bathymetric survey has been published for Halls Pond, so its depth is not documented here.
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Fishing Halls Pond
Reservoir Info (USACE NID)
Halls Pond is a man-made reservoir impounded by the Halls Pond Dike (completed 1900), built primarily for recreation on the Reed Brook; earth-type dam, 10 ft tall and 330 ft long.
- Surface area
- 82 ac
- Normal storage
- 890 ac-ft
- Max storage
- 779 ac-ft
- Drainage area
- 1.23 sq mi
- Hazard class
- Significant
- Owner
- Connecticut DEEP
Source: USACE National Inventory of Dams, NID ID CT00598 · Operator website
Nearby Lakes in Windham County
Frequently asked questions about Halls Pond
Where is Halls Pond?
- Halls Pond is a lake in Windham County, Connecticut. Its water-quality measurements are published by CT DEEP and shown on this page as reported.
What is the water quality of Halls Pond?
- Halls Pond in Windham County, Connecticut has water-quality measurements published by CT DEEP, shown here as reported. Water clarity: 8.1 ft visibility. Surface area: 82 acres.
Is Halls 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
1 measurement from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- North American Lake Management Society
NALMS1 sample · 2020
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.