Where is Little Squam Lake?

Little Squam Lake is a lake in Grafton County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.

How deep is Little Squam Lake?

Little Squam Lake has a maximum depth of 70 feet and an average depth of 32.5 feet. The lake covers 454 acres.

Little Squam Lake

Grafton County, New Hampshire454 acresView map Directions

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

Max depth

70 ft

Bathymetric survey

Area

454 acres

Surface area

Shoreline

8.2 mi

Measured length

Impaired · Mercury
70 ft max depth

See the measurements Directions Where to stay

Little Squam Lake in Grafton County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 70 ft. Surface area: 454 acres.

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Little Squam Lake is a 454-acre lake in Grafton County, New Hampshire with a maximum depth of 70 feet (33-foot average).

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

What Little Squam Lake is good for

From access and monitoring records, not editorial picks.

Deep water70 ft surveyed max depth

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Little Squam Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, nuisance exotic species, oxygen depletion (low DO), pH / acidity, pCBs. Check local advisories before you swim.

Whether Little Squam Lake 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 Little Squam Lake

These are the measurements NHDES publishes for Little Squam Lake, 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 Little Squam Lake

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

Lake Details

Max depth

70 ft

Average depth

32.5 ft

Surface area

454 acres

Shoreline

8.2 mi

The depth above comes from a bathymetric survey of this lake, not from a regional estimate.

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Stays near Little Squam Lake

Compare lakeside cabins, hotels, and vacation rentals near Little Squam Lake in Grafton 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 Little Squam Lake

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Fishing Little Squam Lake

→ Little Squam Lake fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Little Squam Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).

Causes of impairment

MercuryNuisance exotic speciesOxygen depletion (low DO)pH / acidityPCBs

Designated uses not supporting: Aquatic life, Fish consumption.

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

Source: EPA ATTAINS assessment unit NHLAK700010502-01-01 · Official waterbody report

Nearby Lakes in Grafton County

White Oak PondMesotrophic3.1 miView →Perch Pond—View →Mooney-Clark Public Landing LakeMesotrophic—View →Campton Pond—View →Loon Lake-Deep SpotMesotrophic—View →Newfound Lake-Deep SpotOligotrophic—View →

Frequently asked questions about Little Squam Lake

Where is Little Squam Lake?: Little Squam Lake 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 Little Squam Lake?: Little Squam Lake in Grafton County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 70 ft. Surface area: 454 acres.
Is Little Squam Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Little Squam Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, nuisance exotic species, oxygen depletion (low DO), pH / acidity, pCBs. Check local advisories before you swim.
How deep is Little Squam Lake?: Little Squam Lake has a maximum depth of 70 feet and an average depth of 32.5 feet. The lake covers 454 acres.