Long Pond
Middlesex County, Massachusetts43 acresView mapDirections
No nutrient or algae sampling on record from MassDEP for this lake.
- Impaired · Algal growth
- 8 ft max depth
Long Pond in Middlesex County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Maximum depth: 7.5 ft. Surface area: 43 acres.
Long Pond is a 43-acre lake in Middlesex County, Massachusetts with a maximum depth of 8 feet.
Source: EPA Water Quality Portal sampling records, MassDEP. Methodology: how these readings are compared.
Swimming conditions
No readingRecreation use not supported
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, noxious aquatic plants, nutrients (phosphorus, nitrogen), oxygen depletion (low DO), turbidity. 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.
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
7.5 ft
Surface area
43 acres
Shoreline
1.7 mi
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Fishing Long Pond
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
Designated uses not supporting: Aquatic life, Recreation, Other.
Source: EPA ATTAINS assessment unit MA83010 · Official waterbody report
Nearby Lakes in Middlesex County
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: 7.5 ft. Surface area: 43 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, noxious aquatic plants, nutrients (phosphorus, nitrogen), oxygen depletion (low DO), turbidity. Check local advisories before you swim.
How deep is Long Pond?
- Long Pond has a maximum depth of 7.5 feet. The lake covers 43 acres.
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Where this data comes from
Measurements for Long 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