Long Pond is a lake in Middlesex County, Massachusetts. Its water-quality measurements are published by MassDEP and shown on this page as reported.

How deep is Long Pond?

Long Pond has a maximum depth of 20 feet. The lake covers 102 acres.

Are there boat ramps on Long Pond?

Long Pond has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Long Pond. Public access is listed as yes.

Can I fish at Long Pond?

Long Pond has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Massachusetts's fish and wildlife agency, so check its current regulations before you go.

Long Pond

Middlesex County, Massachusetts102 acresView map Directions

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

Max depth

20 ft

Bathymetric survey

Area

102 acres

Surface area

Shoreline

2 mi

Measured length

Impaired · Algal growth
20 ft max depth
Public access

See the measurements Directions Where to stay

Long Pond in Middlesex County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Maximum depth: 20 ft. Surface area: 102 acres.

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Long Pond is a 102-acre lake in Middlesex County, Massachusetts with a maximum depth of 20 feet. Limited fish-species data available. Public access is available with 1 public boat landing.

Source: EPA Water Quality Portal sampling records, MassDEP. Methodology: how these readings are compared.

What Long Pond is good for

From access and monitoring records, not editorial picks.

Boat launch1 documented ramp

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Long Pond is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, nutrients (phosphorus, nitrogen), oxygen depletion (low DO). Check local advisories before you swim.

Whether Long Pond is safe to swim in today is a call for the Massachusetts Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Long Pond

These are the measurements MassDEP publishes for Long 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 Long Pond

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

Lake Details

Max depth

20 ft

Surface area

102 acres

Shoreline

2 mi

Public access

Yes

Listed by MassDEP

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

Recreation & Access

Boat Landings

Yes

Public Access

Long PondPublic

Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps

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Stays near Long Pond

Compare lakeside cabins, hotels, and vacation rentals near Long Pond in Middlesex County, Massachusetts — 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.

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Fishing Long Pond

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

EPA Impairment Status

Long Pond is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).

Causes of impairment

Algal growthNutrients (phosphorus, nitrogen)Oxygen depletion (low DO)

Designated uses not supporting: Aquatic life.

Source: EPA ATTAINS assessment unit MA82072 · Official waterbody report

Nearby Lakes in Middlesex County

Fort Pond1.6 miView →Nagog Pond1.7 miView →Forge Pond3.2 miView →Spectacle Pond3.3 miView →Burges Pond—View →Knops Pond4.8 miView →

Frequently asked questions about Long Pond

Where is Long Pond?: Long Pond is a lake in Middlesex County, Massachusetts. Its water-quality measurements are published by MassDEP and shown on this page as reported.
What is the water quality of Long Pond?: Long Pond in Middlesex County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Maximum depth: 20 ft. Surface area: 102 acres.
Is Long Pond safe to swim in?: Nutrient and algae readings are not a swimming clearance. Long Pond is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, nutrients (phosphorus, nitrogen), oxygen depletion (low DO). Check local advisories before you swim.
How deep is Long Pond?: Long Pond has a maximum depth of 20 feet. The lake covers 102 acres.
Are there boat ramps on Long Pond?: Long Pond has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Long Pond. Public access is listed as yes.
Can I fish at Long Pond?: Long Pond has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Massachusetts's fish and wildlife agency, so check its current regulations before you go.