Locke Lake
Belknap County, New Hampshire149 acresView mapDirections
No nutrient or algae sampling on record from NHDES for this lake.
- Impaired · Algal growth
- 5 ft max depth
Locke Lake in Belknap County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 5 ft. Surface area: 149 acres.
Locke Lake is a 149-acre lake in Belknap County, New Hampshire with a maximum depth of 5 feet.
Source: EPA Water Quality Portal sampling records, your state environmental agency. Methodology: how these readings are compared.
Swimming conditions
No readingBacteria advisory
Nutrient and algae readings are not a swimming clearance. Locke Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, biotoxins, mercury, nuisance exotic species, nutrients (phosphorus, nitrogen), oxygen depletion (low DO), pH / acidity. Check local advisories before you swim.
Whether Locke 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.
Water quality measurements for Locke Lake
These are the measurements NHDES publishes for Locke 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 Locke Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
5 ft
Surface area
149 acres
Shoreline
5 mi
The depth above comes from a bathymetric survey of this lake, not from a regional estimate.
Stays via Stay22
Stays near Locke Lake
Compare lakeside cabins, hotels, and vacation rentals near Locke Lake in Belknap 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 Locke Lake
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.
Follow Locke Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Locke Lake
EPA Impairment Status
Locke Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life, Fish consumption, Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHIMP700060402-02 · Official waterbody report
Nearby Lakes in Belknap County
Frequently asked questions about Locke Lake
Where is Locke Lake?
- Locke Lake is a lake in Belknap County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Locke Lake?
- Locke Lake in Belknap County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 5 ft. Surface area: 149 acres.
Is Locke Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Locke Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, biotoxins, mercury, nuisance exotic species, nutrients (phosphorus, nitrogen), oxygen depletion (low DO), pH / acidity. Check local advisories before you swim.
How deep is Locke Lake?
- Locke Lake has a maximum depth of 5 feet. The lake covers 149 acres.
Explore Locke Lake across LakeQuality
More lakes in New Hampshire
Other Lakes in New Hampshire
Where this data comes from
Measurements for Locke Lake 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