Where is Lake Coniston?

Lake Coniston is a lake in Sullivan County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.

How deep is Lake Coniston?

Lake Coniston has a maximum depth of 20 feet and an average depth of 12.5 feet. The lake covers 128 acres.

Are there boat ramps on Lake Coniston?

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

Can I fish at Lake Coniston?

Lake Coniston 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 New Hampshire's fish and wildlife agency, so check its current regulations before you go.

Lake Coniston

Sullivan County, New Hampshire128 acresView map Directions

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

Max depth

20 ft

Bathymetric survey

Area

128 acres

Surface area

Shoreline

4.2 mi

Measured length

Impaired · Mercury
20 ft max depth
Public access

See the measurements Directions Where to stay

Lake Coniston in Sullivan County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 20 ft. Surface area: 128 acres.

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Lake Coniston is a 128-acre lake in Sullivan County, New Hampshire with a maximum depth of 20 feet (13-foot average). Limited fish-species data available. Public access is available with 1 public boat landing.

Source: EPA Water Quality Portal sampling records, your state environmental agency. Methodology: how these readings are compared.

What Lake Coniston 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. Lake Coniston is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.

Whether Lake Coniston 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.

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Water quality measurements for Lake Coniston

These are the measurements NHDES publishes for Lake Coniston, 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 Coniston

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

Lake Details

Max depth

20 ft

Average depth

12.5 ft

Surface area

128 acres

Shoreline

4.2 mi

Public access

Yes

Listed by NHDES

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

Recreation & Access

Boat Landings

Yes

Public Access

Lake ConistonPublic

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 Lake Coniston

Compare lakeside cabins, hotels, and vacation rentals near Lake Coniston in Sullivan 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 Lake Coniston

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Fishing Lake Coniston

→ Lake Coniston fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Lake Coniston is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).

Causes of impairment

Mercury

Designated uses not supporting: Fish consumption.

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit NHLAK801060405-01 · Official waterbody report

Nearby Lakes in Sullivan County

Rockybound Pond-Deep SpotMesotrophic1.4 miView →Ledge Pond-Deep SpotMesotrophic1.8 miView →Stocker Pond-Deep SpotOligotrophic2.3 miView →Spectacle Pond1.9 miView →Baptist Pond-Deep SpotEutrophic1.9 miView →Perkins Pond-Deep SpotEutrophic2.8 miView →

Frequently asked questions about Lake Coniston

Where is Lake Coniston?: Lake Coniston is a lake in Sullivan County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Lake Coniston?: Lake Coniston in Sullivan County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 20 ft. Surface area: 128 acres.
Is Lake Coniston safe to swim in?: Nutrient and algae readings are not a swimming clearance. Lake Coniston is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Lake Coniston?: Lake Coniston has a maximum depth of 20 feet and an average depth of 12.5 feet. The lake covers 128 acres.
Are there boat ramps on Lake Coniston?: Lake Coniston has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lake Coniston. Public access is listed as yes.
Can I fish at Lake Coniston?: Lake Coniston 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 New Hampshire's fish and wildlife agency, so check its current regulations before you go.