Harriman Reservoir
Windham County, Vermont1,875 acresView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- 78 ft max depth
- Public access
- Limited data
Harriman Reservoir in Windham County, Vermont is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 1875 acres.
- Max depth
- ~78 ft est.
- Area
- 1,875 acres
- Public access
- Yes
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Watch Harriman Reservoir’s letter
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Why Harriman Reservoir has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Harriman Reservoir, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by VT DEC and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
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. Grade methodology: LakeQuality methodology.
What Harriman Reservoir is good for
From access and monitoring records, not editorial picks.
- Big water1,875 acres
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Harriman Reservoir
These readings exist but are not enough for an A–F grade — see why.
No clarity data.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples |
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~78 ft est. |
| Surface Area | 1,875 acres |
| Public Access | Yes |
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
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.
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
Graded lakes near Harriman Reservoir
Harriman Reservoir has no grade, but these lakes within a short drive do.
Nearby Lakes in Windham County
Frequently asked questions about Harriman Reservoir
Where is Harriman Reservoir?
- Harriman Reservoir is a lake in Windham County, Vermont. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Harriman Reservoir?
- Harriman Reservoir in Windham County, Vermont is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 1875 acres.
Is Harriman Reservoir safe to swim in?
- The letter is not a swimming clearance. 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.
Explore Harriman Reservoir across LakeQuality
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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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)