Clay Pond is a lake in Merrimack County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.

How deep is Clay Pond?

Clay Pond has a maximum depth of 18 feet and an average depth of 8.9 feet. The lake covers 30 acres.

Clay Pond

Merrimack County, New Hampshire30 acresView map Directions

No nutrient or algae sampling on record from NHDES for this lake.

Max depth

18 ft

Bathymetric survey

Area

30 acres

Surface area

Shoreline

0.9 mi

Measured length

Impaired · Mercury
18 ft max depth

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Clay Pond in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 18 ft. Surface area: 30 acres.

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Clay Pond is a 30-acre lake in Merrimack County, New Hampshire with a maximum depth of 18 feet (9-foot average).

Source: EPA Water Quality Portal sampling records, your state environmental agency. Methodology: how these readings are compared.

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Clay Pond is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.

Whether Clay 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.

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Water quality measurements for Clay Pond

These are the measurements NHDES publishes for Clay 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 Clay Pond

Answers come straight from the public measurements and survey records on this page.

Lake Details

Max depth

18 ft

Average depth

8.9 ft

Surface area

30 acres

Shoreline

0.9 mi

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Fishing Clay Pond

→ Clay Pond fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Clay Pond is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).

Causes of impairment

Mercury

Designated uses not supporting: Fish consumption.

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit NHLAK700060701-02 · Official waterbody report

Nearby Lakes in Merrimack County

Dubes Pond0.9 miView →Bear Hill Pond-Deep SpotOligotrophic2.6 miView →Heads Pond2.9 miView →Suncook River Lake5.2 miView →Turee Pond-Firehouse Pond OutletMesotrophic—View →Putney Meadow Pond—View →

Frequently asked questions about Clay Pond

Where is Clay Pond?: Clay Pond is a lake in Merrimack County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Clay Pond?: Clay Pond in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 18 ft. Surface area: 30 acres.
Is Clay Pond safe to swim in?: Nutrient and algae readings are not a swimming clearance. Clay Pond is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Clay Pond?: Clay Pond has a maximum depth of 18 feet and an average depth of 8.9 feet. The lake covers 30 acres.