Lake Mahopac
Putnam County, New York598 acresView mapDirections
No nutrient or algae sampling on record from NY DEC for this lake.
- 60 ft max depth
Lake Mahopac in Putnam County, New York has water-quality measurements published by NY DEC, shown here as reported. Maximum depth: 60 ft. Surface area: 598 acres.
Lake Mahopac is a 598-acre lake in Putnam County, New York with a maximum depth of 60 feet (29-foot average).
Source: EPA Water Quality Portal sampling records, NYSDEC. Methodology: how these readings are compared.
What Lake Mahopac is good for
From access and monitoring records, not editorial picks.
- Deep water60 ft surveyed max depth
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Lake Mahopac is safe to swim in today is a call for the New York Department of Environmental Conservation and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lake Mahopac
These are the measurements NY DEC publishes for Lake Mahopac, 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 Lake Mahopac
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
60 ft
Average depth
28.5 ft
Surface area
598 acres
Shoreline
6.5 mi
Stays via Stay22
Stays near Lake Mahopac
Compare lakeside cabins, hotels, and vacation rentals near Lake Mahopac in Putnam County, New York — 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 Lake Mahopac
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 New York’s top lakes →
Follow Lake Mahopac’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Lake Mahopac
Nearby Lakes in Putnam County
Frequently asked questions about Lake Mahopac
Where is Lake Mahopac?
- Lake Mahopac is a lake in Putnam County, New York. Its water-quality measurements are published by NY DEC and shown on this page as reported.
What is the water quality of Lake Mahopac?
- Lake Mahopac in Putnam County, New York has water-quality measurements published by NY DEC, shown here as reported. Maximum depth: 60 ft. Surface area: 598 acres.
Is Lake Mahopac safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Lake Mahopac?
- Lake Mahopac has a maximum depth of 60 feet and an average depth of 28.5 feet. The lake covers 598 acres.
Explore Lake Mahopac across LakeQuality
More lakes in New York
Other Lakes in New York
Where this data comes from
Measurements for Lake Mahopac come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.