Lake Dunmore
Addison County, Vermont985 acresView mapDirections
Vermont DEC publishes the water-quality measurements for Lake Dunmore. Here is what has been measured.
- Mesotrophic
- Impaired · Hydrologic alteration
- 57 ft max depth
- Public access
Lake Dunmore in Addison County, Vermont has water-quality measurements published by Vermont DEC, shown here as reported. Water clarity: 16.4 ft visibility. Phosphorus: 10.9 µg/L. Chlorophyll-a (algae): 2.9 µg/L. Surface area: 985 acres.
Lake Dunmore is a 985-acre mesotrophic lake in Addison County, Vermont with an estimated average depth of about 57 feet. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 4 other monitored lakes in Addison County, Lake Dunmore ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, VT DEC, last sampled 2025-08-13. Methodology: how these readings are compared.
Lake Dunmore covers about 990 acres in Addison County. It has one public boat landing. Vrbo is where to look for cabins and lake homes around Lake Dunmore, and Booking.com and Expedia search hotels near the lake for your dates.
What Lake Dunmore is good for
From access and monitoring records, not editorial picks.
- Clear water16.4 ft of visibility
- Boat launch1 documented ramp
Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Lake Dunmore is listed impaired under Clean Water Act §303(d) (IR 4C) for hydrologic alteration. Check local advisories before you swim.
Whether Lake Dunmore 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 Lake Dunmore
These are the measurements Vermont DEC publishes for Lake Dunmore, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 16.4 ft down. Phosphorus 10.9 µg/L. Chlorophyll-a 2.9 µg/L. TSI 39.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 16.4ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 10.9µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 2.9µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 39 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Lake Dunmore
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~57 ft est.
Surface area
985 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 Lake Dunmore.
Lake Size & Watershed
Watershed (drainage) area
21 sq mi
HydroLAKES / HydroSHEDS
Shoreline
8.9 mi
HydroLAKES / HydroSHEDS
Elevation
574 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.
Recreation & Access
- MagoonPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Lake Dunmore
Compare lakeside cabins, hotels, and vacation rentals near Lake Dunmore in Addison 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 Lake Dunmore
Prices for Oct 30–Nov 1, 4 adults. Change dates on the map below.
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Planning a trip? Cabins and lodging at Lake Dunmore → · more Vermont lake trips
Follow Lake Dunmore’s readings
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Fishing Lake Dunmore
Water Quality Trend: Improving
Based on 6 years of monitoring (2020–2025).
Water clarity
Stable6 years
Phosphorus
Improving-1.03 µg/L/yr6 years
Chlorophyll-a
Improving-0.71 µg/L/yr6 years
Reservoir Info (USACE NID)
Lake Dunmore is a man-made reservoir impounded by the Lake Dunmore (completed 1920), built primarily for hydroelectric on the Leicester River; earth-type dam, 8 ft tall and 70 ft long.
- Surface area
- 985 ac
- Normal storage
- 0 ac-ft
- Max storage
- 4,900 ac-ft
- Drainage area
- 20.42 sq mi
- Hazard class
- Low
- Owner
- GREEN MOUNTAIN POWER CORP
Source: USACE National Inventory of Dams, NID ID VT00191 · Operator website
EPA Impairment Status
Lake Dunmore is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4C).
Causes of impairment
Designated uses not supporting: Aquatic life.
Source: EPA ATTAINS assessment unit VT03-04L05_01 · Official waterbody report
Nearby Lakes in Addison County
Frequently asked questions about Lake Dunmore
Where is Lake Dunmore?
- Lake Dunmore is a lake in Addison County, Vermont. Its water-quality measurements are published by Vermont DEC and shown on this page as reported.
What is the water quality of Lake Dunmore?
- Lake Dunmore in Addison County, Vermont has water-quality measurements published by Vermont DEC, shown here as reported. Water clarity: 16.4 ft visibility. Phosphorus: 10.9 µg/L. Chlorophyll-a (algae): 2.9 µg/L. Surface area: 985 acres.
Is Lake Dunmore safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lake Dunmore is listed impaired under Clean Water Act §303(d) (IR 4C) for hydrologic alteration. Check local advisories before you swim.
How deep is Lake Dunmore?
- No published bathymetric survey covers Lake Dunmore, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 57 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 985 acres.
Are there boat ramps on Lake Dunmore?
- Lake Dunmore has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Magoon. Public access is listed as yes.
Can I fish at Lake Dunmore?
- Lake Dunmore 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 Vermont's fish and wildlife agency, so check its current regulations before you go.
Explore Lake Dunmore across LakeQuality
2 documented falls within 11 mi, nearest Texas Falls
Species activity outlook by water temperature and season
Where to stay at Vermont's top lakes, each with its readings
Vermont's cleanest lakes, ranked on agency measurements
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Other Lakes in Vermont
Mesotrophic Lakes in Vermont
Where this data comes from
271 measurements from 2 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Vermont Dept of Environmental Conservation
1VTDECWQ271 samples · 2020–2025
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
Monitoring station identifiers (2)
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)
Named boat-access points from the USGS National Boat Ramps inventory