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

The Basin

Carroll County, New Hampshire55 acresView map Directions

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

Area

55 acres

Surface area

Shoreline

1.4 mi

Measured length

Impaired · Mercury

See the measurements Directions Where to stay

The Basin in Carroll County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Surface area: 55 acres.

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The Basin is a 55-acre lake in Carroll County, New Hampshire.

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. The Basin is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.

Whether The Basin 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 The Basin

These are the measurements NHDES publishes for The Basin, 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 The Basin

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

Lake Details

Surface area

55 acres

Shoreline

1.4 mi

No bathymetric survey has been published for The Basin, so its depth is not documented here.

Stays via Stay22

Stays near The Basin

Compare lakeside cabins, hotels, and vacation rentals near The Basin in Carroll County, New Hampshire — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.

Top-rated places to stay near The Basin

Prices for Oct 16–18, 4 adults. Change dates on the map below.

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Follow The Basin’s readings

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Fishing The Basin

→ The Basin fishing regulations (limits, seasons, special rules)

EPA Impairment Status

The Basin 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 NHLAK700020106-04 · Official waterbody report

Nearby Lakes in Carroll County

Mirror Lake1 miView →Copps Pond4 miView →Front Bay4.1 miView →Sargents Pond4.1 miView →Upper Beech Pond4.4 miView →Lower Beech Pond-Deep SpotOligotrophic5.2 miView →

Frequently asked questions about The Basin

Where is The Basin?: The Basin is a lake in Carroll County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of The Basin?: The Basin in Carroll County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Surface area: 55 acres.
Is The Basin safe to swim in?: Nutrient and algae readings are not a swimming clearance. The Basin is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.