Lake Eileen
Belknap County, New Hampshire45 acresView mapDirections
No nutrient or algae sampling on record from NHDES for this lake.
- Impaired · Mercury
- 20 ft max depth
Lake Eileen in Belknap County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 20 ft. Surface area: 45 acres.
Lake Eileen is a 45-acre lake in Belknap 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. Lake Eileen is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Lake Eileen 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 Lake Eileen
These are the measurements NHDES publishes for Lake Eileen, 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 Lake Eileen
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
20 ft
Average depth
11.2 ft
Surface area
45 acres
Shoreline
1.4 mi
The depth above comes from a bathymetric survey of this lake, not from a regional estimate.
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Fishing Lake Eileen
EPA Impairment Status
Lake Eileen 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 NHLAK700060401-09 · Official waterbody report
Nearby Lakes in Belknap County
Frequently asked questions about Lake Eileen
Where is Lake Eileen?
- Lake Eileen is a lake in Belknap County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Lake Eileen?
- Lake Eileen in Belknap County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 20 ft. Surface area: 45 acres.
Is Lake Eileen safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lake Eileen is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Lake Eileen?
- Lake Eileen has a maximum depth of 20 feet and an average depth of 11.2 feet. The lake covers 45 acres.
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Where this data comes from
Measurements for Lake Eileen 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