Line Pond
Grafton County, New Hampshire47 acresView mapDirections
No nutrient or algae sampling on record from NHDES for this lake.
- Impaired · Mercury
- 34 ft max depth
Line Pond in Grafton County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 34.1 ft. Surface area: 47 acres.
Line Pond is a 47-acre lake in Grafton County, New Hampshire with a maximum depth of 34 feet (16-foot average).
Source: EPA Water Quality Portal sampling records, your state environmental agency. Methodology: how these readings are compared.
What Line Pond is good for
From access and monitoring records, not editorial picks.
- Deep water34.1 ft surveyed max depth
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Line Pond is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Line Pond 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 Line Pond
These are the measurements NHDES publishes for Line Pond, 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 Line Pond
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
34.1 ft
Average depth
16.4 ft
Surface area
47 acres
Shoreline
1.5 mi
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Stays near Line Pond
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Fishing Line Pond
EPA Impairment Status
Line Pond 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 NHLAK700010304-03 · Official waterbody report
Nearby Lakes in Grafton County
Frequently asked questions about Line Pond
Where is Line Pond?
- Line Pond is a lake in Grafton County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Line Pond?
- Line Pond in Grafton County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 34.1 ft. Surface area: 47 acres.
Is Line Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Line Pond is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Line Pond?
- Line Pond has a maximum depth of 34.1 feet and an average depth of 16.4 feet. The lake covers 47 acres.
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Where this data comes from
Measurements for Line Pond 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