Contoocook Lake Dam
Cheshire County, New Hampshire443 acresView mapDirections
No nutrient or algae sampling on record from NHDES for this lake.
- Limited data
Contoocook Lake Dam in Cheshire County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Surface area: 443 acres.
Contoocook Lake Dam is a 443-acre lake in Cheshire County, New Hampshire.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-08-23. 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 Contoocook Lake Dam 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 Contoocook Lake Dam
These are the measurements NHDES publishes for Contoocook Lake Dam, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data.
Ask about Contoocook Lake Dam
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
443 acres
No bathymetric survey has been published for Contoocook Lake Dam, so its depth is not documented here.
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Fishing Contoocook Lake Dam
Reservoir Info (USACE NID)
Contoocook Lake Dam is a man-made reservoir impounded by the Contoocook Lake Dam (completed 1885), built primarily for recreation on the Contoocook River; earth-type dam, 7 ft tall and 400 ft long.
- Surface area
- 443 ac
- Normal storage
- 1,548 ac-ft
- Max storage
- 2,726 ac-ft
- Drainage area
- 15.6 sq mi
- Hazard class
- Low
- Owner
- TOWN OF JAFFREY
Source: USACE National Inventory of Dams, NID ID NH00098 · Operator website
Nearby Lakes in Cheshire County
Frequently asked questions about Contoocook Lake Dam
Where is Contoocook Lake Dam?
- Contoocook Lake Dam 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 Contoocook Lake Dam?
- Contoocook Lake Dam in Cheshire County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Surface area: 443 acres.
Is Contoocook Lake Dam 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
9 measurements from 1 monitoring station, 2022–2024. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- New Hampshire Department Of Environmental Services (BEACH)
111133009 samples · 2022–2024
Analytical methods
- 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.