Harriman Reservoir
Windham County, Vermont1,875 acresView mapDirections
No nutrient or algae sampling on record from Vermont DEC for this lake.
- Impaired · Mercury
- 78 ft max depth
- Public access
- Limited data
Harriman Reservoir in Windham County, Vermont has water-quality measurements published by Vermont DEC, shown here as reported. Surface area: 1875 acres.
Harriman Reservoir is a 1,875-acre lake in Windham County, Vermont with an estimated average depth of about 78 feet. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, VT DEC, last sampled 2023-05-15. Methodology: how these readings are compared.
Harriman Reservoir covers about 1,900 acres in Windham County. For a place on the water, look through cabin and lake-house rentals near Harriman Reservoir on Vrbo. For a hotel or motel room, Booking.com and Expedia both search around the lake.
What Harriman Reservoir is good for
From access and monitoring records, not editorial picks.
- Big water1,875 acres
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Harriman Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Harriman Reservoir is safe to swim in today is a call for the Vermont Department of Environmental Conservation and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Harriman Reservoir
These are the measurements Vermont DEC publishes for Harriman 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.
Ask about Harriman Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~78 ft est.
Surface area
1,875 acres
Public access
Yes
Listed by Vermont DEC
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Vermont has not published bathymetry for Harriman Reservoir.
Lake Size & Watershed
Watershed (drainage) area
181 sq mi
HydroLAKES / HydroSHEDS
Shoreline
18.8 mi
HydroLAKES / HydroSHEDS
Elevation
1,450 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Stays via Stay22
Stays near Harriman Reservoir
Compare lakeside cabins, hotels, and vacation rentals near Harriman Reservoir in Windham County, Vermont — 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 Harriman Reservoir
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Fishing Harriman Reservoir
Reservoir Info (USACE NID)
Harriman Reservoir is a man-made reservoir impounded by the Harriman (completed 1924), built primarily for hydroelectric on the Deerfield River; other-type dam, 186 ft tall and 1,250 ft long.
- Surface area
- 1,875 ac
- Normal storage
- 103,375 ac-ft
- Max storage
- 116,075 ac-ft
- Drainage area
- 184 sq mi
- Hazard class
- High
- Owner
- Great River Hydro, LLC
All listed purposes: Hydroelectric;Recreation.
Source: USACE National Inventory of Dams, NID ID VT00025 · Operator website
EPA Impairment Status
Harriman 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: Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit VT12-01L01 · Official waterbody report
Nearby Lakes in Windham County
Frequently asked questions about Harriman Reservoir
Where is Harriman Reservoir?
- Harriman Reservoir is a lake in Windham County, Vermont. Its water-quality measurements are published by Vermont DEC and shown on this page as reported.
What is the water quality of Harriman Reservoir?
- Harriman Reservoir in Windham County, Vermont has water-quality measurements published by Vermont DEC, shown here as reported. Surface area: 1875 acres.
Is Harriman Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Harriman Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Harriman Reservoir?
- No published bathymetric survey covers Harriman Reservoir, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 78 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 1875 acres.
Can I fish at Harriman Reservoir?
- Public access to Harriman Reservoir is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Vermont's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
6 measurements from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Vermont Dept of Environmental Conservation
1VTDECWQ6 samples · 2023
Analytical methods
- EPA approved Alternate Test Procedure for 4500 P H. Has a 28 day hold without acid preservation.
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- 2130 B ~ Nephelometric Method
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)