Where is Little Diamond Pond?

Little Diamond Pond is a lake in Coos County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.

How deep is Little Diamond Pond?

Little Diamond Pond has a maximum depth of 10 feet. The lake covers 60 acres.

Are there boat ramps on Little Diamond Pond?

Little Diamond Pond has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Coleman State Park. Public access is listed as yes.

Can I fish at Little Diamond Pond?

Little Diamond Pond 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.

Little Diamond Pond

Coos County, New Hampshire60 acresView map Directions

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

Max depth

10 ft

Bathymetric survey

Area

60 acres

Surface area

Shoreline

1.4 mi

Measured length

Impaired · Algal growth
10 ft max depth
Public access

See the measurements Directions Where to stay

Little Diamond Pond in Coos County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 10 ft. Surface area: 60 acres.

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Little Diamond Pond is a 60-acre lake in Coos County, New Hampshire with a maximum depth of 10 feet. 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 Little Diamond Pond 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. Little Diamond Pond is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, mercury, nutrients (phosphorus, nitrogen), pH / acidity. Check local advisories before you swim.

Whether Little Diamond Pond 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 Little Diamond Pond

These are the measurements NHDES publishes for Little Diamond 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 Little Diamond Pond

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

Lake Details

Max depth

10 ft

Surface area

60 acres

Shoreline

1.4 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

Coleman State ParkPublic

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 Little Diamond Pond

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Top-rated places to stay near Little Diamond Pond

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Fishing Little Diamond Pond

→ Little Diamond Pond fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Little Diamond Pond is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).

Causes of impairment

Algal growthMercuryNutrients (phosphorus, nitrogen)pH / acidity

Designated uses not supporting: Aquatic life, Fish consumption.

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

Source: EPA ATTAINS assessment unit NHLAK400010403-02 · Official waterbody report

Nearby Lakes in Coos County

Diamond Pond0.8 miView →Mud Pond3.2 miView →Lake Gloriette5.5 miView →Lake Francis7 miView →Back Lake9.3 miView →First Connecticut Lake-Deep Spot10.4 miView →

Frequently asked questions about Little Diamond Pond

Where is Little Diamond Pond?: Little Diamond Pond is a lake in Coos County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Little Diamond Pond?: Little Diamond Pond in Coos County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 10 ft. Surface area: 60 acres.
Is Little Diamond Pond safe to swim in?: Nutrient and algae readings are not a swimming clearance. Little Diamond Pond is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, mercury, nutrients (phosphorus, nitrogen), pH / acidity. Check local advisories before you swim.
How deep is Little Diamond Pond?: Little Diamond Pond has a maximum depth of 10 feet. The lake covers 60 acres.
Are there boat ramps on Little Diamond Pond?: Little Diamond Pond has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Coleman State Park. Public access is listed as yes.
Can I fish at Little Diamond Pond?: Little Diamond Pond 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.