Where is Ashokan Reservoir?

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

Ashokan Reservoir

Ulster County, New York3,129 acresView map Directions

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

Area

3,129 acres

Surface area

Impaired · Mercury

See the measurements Directions Where to stay

Ashokan Reservoir in Ulster County, New York has water-quality measurements published by NY DEC, shown here as reported. Surface area: 3129 acres.

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Ashokan Reservoir is a 3,129-acre lake in Ulster County, New York.

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

What Ashokan Reservoir is good for

From access and monitoring records, not editorial picks.

Big water3,129 acres

Swimming conditions

No reading

Not rated

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

Whether Ashokan 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 Ashokan Reservoir

These are the measurements NY DEC publishes for Ashokan 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 Ashokan Reservoir

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

Lake Details

Surface area

3,129 acres

No bathymetric survey has been published for Ashokan Reservoir, so its depth is not documented here.

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Stays near Ashokan Reservoir

Compare lakeside cabins, hotels, and vacation rentals near Ashokan Reservoir in Ulster 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 Ashokan Reservoir

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Fishing Ashokan Reservoir

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

EPA Impairment Status

Ashokan 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: Drinking water, Aquatic life.

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

Source: EPA ATTAINS assessment unit NY1307-0004 · Official waterbody report

Nearby Lakes in Ulster County

Kenozia Lake4.8 miView →Ashokan Reservoir4.7 miView →Yankeetown Pond5.7 miView →Lyonsville Pond8.1 miView →Cooper Lake7.8 miView →Fourth Lake11.1 miView →

Frequently asked questions about Ashokan Reservoir

Where is Ashokan Reservoir?: Ashokan Reservoir is a lake in Ulster 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 Ashokan Reservoir?: Ashokan Reservoir in Ulster County, New York has water-quality measurements published by NY DEC, shown here as reported. Surface area: 3129 acres.
Is Ashokan Reservoir safe to swim in?: Nutrient and algae readings are not a swimming clearance. Ashokan Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.