Ashokan Reservoir
Ulster County, New York5,162 acresView mapDirections
No nutrient or algae sampling on record from NY DEC for this lake.
- Impaired · Mercury
- 184 ft max depth
Ashokan Reservoir in Ulster County, New York has water-quality measurements published by NY DEC, shown here as reported. Maximum depth: 184.4 ft. Surface area: 5162 acres.
Ashokan Reservoir is a 5,162-acre lake in Ulster County, New York with a maximum depth of 184 feet (51-foot average).
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.
- Deep water184.4 ft surveyed max depth
- Big water5,162 acres
Swimming conditions
No readingNot 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.
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
Max depth
184.4 ft
Average depth
51.2 ft
Surface area
5,162 acres
Shoreline
29.7 mi
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Fishing Ashokan Reservoir
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
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
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. Maximum depth: 184.4 ft. Surface area: 5162 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.
How deep is Ashokan Reservoir?
- Ashokan Reservoir has a maximum depth of 184.4 feet and an average depth of 51.2 feet. The lake covers 5162 acres.
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Where this data comes from
Measurements for Ashokan Reservoir 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