Lake Mirror
Washington County, Vermont86 acresView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Mesotrophic
- #4 of 9 in the county
- 37 ft max depth
- Public access
Lake Mirror in Washington County, Vermont has a water quality grade of A (Excellent). Water clarity: 21.3 ft visibility. Phosphorus: 10.8 µg/L. Chlorophyll-a (algae): 2.6 µg/L. Surface area: 86 acres.
- Clarity
- 21.3 ft
- Max depth
- ~37 ft est.
- Area
- 86 acres
- Type
- Mesotrophic
- Phosphorus
- 10.8 µg/L
- Chlorophyll-a
- 2.6 µg/L
- Trend
- ↑ Improving
- Public access
- Yes
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Watch Lake Mirror’s letter
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Lake Mirror is a 86-acre mesotrophic lake in Washington County, Vermont with an estimated average depth of about 37 feet. Water quality is graded A based on 2 sampling years through 2025. 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 8 other monitored lakes in Washington County, Lake Mirror ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, VT DEC, last sampled 2025-09-18. Grade methodology: LakeQuality methodology.
What Lake Mirror is good for
From access and monitoring records, not editorial picks.
- Clear water21.3 ft of visibility
- Boat launch1 documented ramp
Swimming Safety
Grade onlyLow algae
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: A (Excellent)
Crystal clear, you can see 21.3 ft down. Phosphorus 10.8 µg/L. Chlorophyll-a 2.6 µg/L. TSI 37. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 21.3 ft | Not graded |
| Phosphorus | 10.8 µg/L | Good |
| Chlorophyll-a (Algae) | 2.6 µg/L | Good |
| Trophic State Index (TSI) | 37 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~37 ft est. |
| Average Depth | ~21 ft est. |
| Surface Area | 86 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 Lake Mirror.
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.
Recreation & Access
- Mirror LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Lake Mirror
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.236 m/yr | 6 |
| Phosphorus | ↑ Improving | -0.59 µg/L/yr | 6 |
| Chlorophyll-a | ↑ Improving | -0.45 µg/L/yr | 6 |
Reservoir Info (USACE NID)
Lake Mirror is a man-made reservoir impounded by the Mirror Lake (completed 1820), built primarily for recreation on the Dugar Brook-Tr; masonry-type dam, 8 ft tall and 125 ft long.
- Surface area
- 86 ac
- Normal storage
- 0 ac-ft
- Max storage
- 540 ac-ft
- Drainage area
- 5.47 sq mi
- Hazard class
- Significant
- Owner
- ERIC DAVIS
Source: USACE National Inventory of Dams, NID ID VT00082 · Operator website
County Ranking
Ranked #4 of 9 lakes in Washington County
Nearby Lakes in Washington County
Frequently asked questions about Lake Mirror
Where is Lake Mirror?
- Lake Mirror is a lake in Washington County, Vermont. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Mirror?
- Lake Mirror in Washington County, Vermont has a water quality grade of A (Excellent). Water clarity: 21.3 ft visibility. Phosphorus: 10.8 µg/L. Chlorophyll-a (algae): 2.6 µg/L. Surface area: 86 acres.
Is Lake Mirror safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
How deep is Lake Mirror?
- No published bathymetric survey covers Lake Mirror, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 37 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 86 acres.
Are there boat ramps on Lake Mirror?
- Lake Mirror has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Mirror Lake. Public access is listed as yes.
Explore Lake Mirror across LakeQuality
More Vermont Lake Rankings
Other Grade A Lakes in Vermont
Mesotrophic Lakes in Vermont
Where this data comes from
198 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
1VTDECWQ198 samples · 2020–2025
Analytical methods
- 4500 P H ~ Manual Digestion and Flow Injection Analysis for Total Phosphorus
- 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 (2)
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)
Named boat-access points from the USGS National Boat Ramps inventory