Walden Pond
Middlesex County, Massachusetts63 acresView mapDirections
No nutrient or algae sampling on record from MassDEP for this lake.
- Impaired · Mercury
- 108 ft max depth
Walden Pond in Middlesex County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Maximum depth: 108.3 ft. Surface area: 63 acres.
Walden Pond is a 63-acre lake in Middlesex County, Massachusetts with a maximum depth of 108 feet.
Source: EPA Water Quality Portal sampling records, MassDEP. Methodology: how these readings are compared.
What Walden Pond is good for
From access and monitoring records, not editorial picks.
- Deep water108.3 ft surveyed max depth
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Walden Pond is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Walden 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 Walden Pond
These are the measurements MassDEP publishes for Walden 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 Walden Pond
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
108.3 ft
Surface area
63 acres
Shoreline
1.8 mi
Stays via Stay22
Stays near Walden Pond
Compare lakeside cabins, hotels, and vacation rentals near Walden 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.
Top-rated places to stay near Walden Pond
Prices for Oct 16–18, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Massachusetts’s top lakes →
Follow Walden Pond’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Walden Pond
EPA Impairment Status
Walden Pond is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MA82109 · Official waterbody report
Nearby Lakes in Middlesex County
Frequently asked questions about Walden Pond
Where is Walden Pond?
- Walden 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 Walden Pond?
- Walden Pond in Middlesex County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Maximum depth: 108.3 ft. Surface area: 63 acres.
Is Walden Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Walden Pond is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Walden Pond?
- Walden Pond has a maximum depth of 108.3 feet. The lake covers 63 acres.
Explore Walden Pond across LakeQuality
More lakes in Massachusetts
Other Lakes in Massachusetts
Where this data comes from
Measurements for Walden 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