Where is Stillwater Reservoir?

Stillwater Reservoir is a lake in Herkimer County, New York. Its water-quality measurements are published by NY DEC and shown on this page as reported.

How deep is Stillwater Reservoir?

Stillwater Reservoir has a maximum depth of 32.8 feet. The lake covers 6233 acres.

Are there boat ramps on Stillwater Reservoir?

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

Can I fish at Stillwater Reservoir?

Stillwater Reservoir 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 York's fish and wildlife agency, so check its current regulations before you go.

Stillwater Reservoir

Herkimer County, New York6,233 acresView map Directions

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

Max depth

32.8 ft

Bathymetric survey

Area

6,233 acres

Surface area

Shoreline

82.2 mi

Measured length

Impaired · Mercury
33 ft max depth
Public access

See the measurements Directions Where to stay

Stillwater Reservoir in Herkimer County, New York has water-quality measurements published by NY DEC, shown here as reported. Maximum depth: 32.8 ft. Surface area: 6233 acres.

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Stillwater Reservoir is a 6,233-acre lake in Herkimer County, New York with a maximum depth of 33 feet. Limited fish-species data available. Public access is available with 1 public boat landing.

Source: EPA Water Quality Portal sampling records, NYSDEC. Methodology: how these readings are compared.

What Stillwater Reservoir is good for

From access and monitoring records, not editorial picks.

Boat launch1 documented ramp
Deep water32.8 ft surveyed max depth
Big water6,233 acres

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Stillwater Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.

Whether Stillwater Reservoir 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.

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Water quality measurements for Stillwater Reservoir

These are the measurements NY DEC publishes for Stillwater Reservoir, 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 Stillwater Reservoir

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

Lake Details

Max depth

32.8 ft

Surface area

6,233 acres

Shoreline

82.2 mi

Public access

Yes

Listed by NY DEC

Recreation & Access

Boat Landings

Yes

Public Access

Stillwater ReservoirPublic

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 Stillwater Reservoir

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Top-rated places to stay near Stillwater Reservoir

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Fishing Stillwater Reservoir

→ Stillwater Reservoir fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Stillwater Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).

Causes of impairment

Mercury

Designated uses not supporting: Aquatic life.

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

Source: EPA ATTAINS assessment unit NY0801-0281 · Official waterbody report

Nearby Lakes in Herkimer County

Peaked Mountain Lake1.1 miView →Evergreen Lake1.3 miView →Shallow Pond2.2 miView →Mud Lake2.2 miView →Lyon Lake3.2 miView →Diana Pond—View →

Frequently asked questions about Stillwater Reservoir

Where is Stillwater Reservoir?: Stillwater Reservoir is a lake in Herkimer 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 Stillwater Reservoir?: Stillwater Reservoir in Herkimer County, New York has water-quality measurements published by NY DEC, shown here as reported. Maximum depth: 32.8 ft. Surface area: 6233 acres.
Is Stillwater Reservoir safe to swim in?: Nutrient and algae readings are not a swimming clearance. Stillwater Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Stillwater Reservoir?: Stillwater Reservoir has a maximum depth of 32.8 feet. The lake covers 6233 acres.
Are there boat ramps on Stillwater Reservoir?: Stillwater Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Stillwater Reservoir. Public access is listed as yes.
Can I fish at Stillwater Reservoir?: Stillwater Reservoir 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 York's fish and wildlife agency, so check its current regulations before you go.