Seaver Reservoir
Cheshire County, New Hampshire33 acresView mapDirections
No nutrient or algae sampling on record from NHDES for this lake.
- Impaired · Mercury
- 20 ft max depth
Seaver Reservoir in Cheshire County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 20 ft. Surface area: 33 acres.
Seaver Reservoir is a 33-acre lake in Cheshire County, New Hampshire with a maximum depth of 20 feet (11-foot average).
Source: EPA Water Quality Portal sampling records, your state environmental agency. Methodology: how these readings are compared.
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Seaver Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Seaver Reservoir 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 Seaver Reservoir
These are the measurements NHDES publishes for Seaver Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. TSI undefined.
Ask about Seaver Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
20 ft
Average depth
10.5 ft
Surface area
33 acres
Shoreline
1.2 mi
The depth above comes from a bathymetric survey of this lake, not from a regional estimate.
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Fishing Seaver Reservoir
EPA Impairment Status
Seaver Reservoir 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: Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK802010202-08 · Official waterbody report
Nearby Lakes in Cheshire County
Frequently asked questions about Seaver Reservoir
Where is Seaver Reservoir?
- Seaver Reservoir 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 Seaver Reservoir?
- Seaver Reservoir in Cheshire County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 20 ft. Surface area: 33 acres.
Is Seaver Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Seaver Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Seaver Reservoir?
- Seaver Reservoir has a maximum depth of 20 feet and an average depth of 10.5 feet. The lake covers 33 acres.
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Where this data comes from
Measurements for Seaver Reservoir come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database