Swanzey Lake-Public Beach
Cheshire County, New Hampshire111 acresView mapDirections
NHDES publishes the water-quality measurements for Swanzey Lake-Public Beach. Here is what has been measured.
- Impaired · Mercury
- Public access
- Limited data
Swanzey Lake-Public Beach in Cheshire County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 5 µg/L. Surface area: 111 acres.
Swanzey Lake-Public Beach is a 111-acre lake in Cheshire County, New Hampshire. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-09-19. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Swanzey Lake-Public Beach is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, pH / acidity. Check local advisories before you swim.
Whether Swanzey Lake-Public Beach is safe to swim in today is a call for the New Hampshire Department of Environmental Services and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Swanzey Lake-Public Beach
These are the measurements NHDES publishes for Swanzey Lake-Public Beach, 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 5 µg/L. TSI 27.
| 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 | 5µg/L | Measured, not scored 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. | 27 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Swanzey Lake-Public Beach
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
111 acres
Public access
Yes
Listed by NHDES
No bathymetric survey has been published for Swanzey Lake-Public Beach, so its depth is not documented here.
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Fishing Swanzey Lake-Public Beach
Reservoir Info (USACE NID)
Swanzey Lake-Public Beach is a man-made reservoir impounded by the Swanzey Lake Dam (completed 1790), built primarily for recreation on the Tr Perry Brook; earth-type dam, 12 ft tall and 150 ft long.
- Surface area
- 111 ac
- Normal storage
- 348 ac-ft
- Max storage
- 641 ac-ft
- Drainage area
- 1.63 sq mi
- Hazard class
- Low
- Owner
- TOWN OF SWANZEY
Source: USACE National Inventory of Dams, NID ID NH00205 · Operator website · Matched by proximity (0.5 km)
EPA Impairment Status
Swanzey Lake-Public Beach is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Aquatic life, Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK802010302-01-01 · Official waterbody report
Nearby Lakes in Cheshire County
Frequently asked questions about Swanzey Lake-Public Beach
Where is Swanzey Lake-Public Beach?
- Swanzey Lake-Public Beach is a lake in Cheshire County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Swanzey Lake-Public Beach?
- Swanzey Lake-Public Beach in Cheshire County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 5 µg/L. Surface area: 111 acres.
Is Swanzey Lake-Public Beach safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Swanzey Lake-Public Beach is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, pH / acidity. Check local advisories before you swim.
Can I fish at Swanzey Lake-Public Beach?
- Public access to Swanzey Lake-Public Beach is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by New Hampshire's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
1 measurement from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- New Hampshire Department Of Environmental Services (BEACH)
111133001 sample · 2024
Analytical methods
- 10-115-01-1 F ~ LACHAT; Total Phosphorus- Manual persulfate digest
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
Impairment status from EPA ATTAINS 303(d) database