Lowell Lake
Windham County, Vermont100 acresView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Oligotrophic
- #2 of 9 in the county
- 44 ft max depth
Lowell Lake in Windham County, Vermont has a water quality grade of A (Excellent). Water clarity: 13.5 ft visibility. Phosphorus: 8.2 µg/L. Chlorophyll-a (algae): 1.8 µg/L. Surface area: 100 acres.
- Clarity
- 13.5 ft
- Max depth
- ~44 ft est.
- Area
- 100 acres
- Type
- Oligotrophic
- Phosphorus
- 8.2 µg/L
- Chlorophyll-a
- 1.8 µg/L
- Trend
- ↑ Improving
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Watch Lowell Lake’s letter
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Lowell Lake is a 100-acre cold, clear oligotrophic lake in Windham County, Vermont with an estimated average depth of about 44 feet. Water quality is graded A based on 2 sampling years through 2025. Overall water quality is improving over recent sampling years. Compared to the 8 other monitored lakes in Windham County, Lowell Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, VT DEC, last sampled 2025-08-14. Grade methodology: LakeQuality methodology.
What Lowell Lake is good for
From access and monitoring records, not editorial picks.
- Clear water13.5 ft of visibility
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)
Good clarity, visible to about 13.5 ft. Phosphorus 8.2 µg/L. Chlorophyll-a 1.8 µg/L. TSI 37. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13.5 ft | Not graded |
| Phosphorus | 8.2 µg/L | Good |
| Chlorophyll-a (Algae) | 1.8 µg/L | Good |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~44 ft est. |
| Average Depth | ~15 ft est. |
| Surface Area | 100 acres |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Vermont has not published bathymetry for Lowell Lake.
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 Lowell Lake
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.031 m/yr | 6 |
| Phosphorus | ↑ Improving | -1.03 µg/L/yr | 4 |
| Chlorophyll-a | ↑ Improving | -1.89 µg/L/yr | 4 |
Reservoir Info (USACE NID)
Lowell Lake is a man-made reservoir impounded by the Lowell Lake (completed 1850), built primarily for recreation on the West River-Tr; earth-type dam, 16 ft tall and 225 ft long.
- Surface area
- 100 ac
- Normal storage
- 0 ac-ft
- Max storage
- 1,475 ac-ft
- Drainage area
- 2.05 sq mi
- Hazard class
- High
- Owner
- STATE OF VERMONT - FPR
Source: USACE National Inventory of Dams, NID ID VT00079 · Operator website
County Ranking
Ranked #2 of 9 lakes in Windham County
Nearby Lakes in Windham County
Frequently asked questions about Lowell Lake
Where is Lowell Lake?
- Lowell Lake is a lake in Windham County, Vermont. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lowell Lake?
- Lowell Lake in Windham County, Vermont has a water quality grade of A (Excellent). Water clarity: 13.5 ft visibility. Phosphorus: 8.2 µg/L. Chlorophyll-a (algae): 1.8 µg/L. Surface area: 100 acres.
Is Lowell Lake safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
How deep is Lowell Lake?
- No published bathymetric survey covers Lowell Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 44 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 100 acres.
Explore Lowell Lake across LakeQuality
6.5 mi away · 125 ft
Species activity outlook by water temperature and season
Where to stay at Vermont's top lakes, each with its grade
Low nutrients, clear water. The letter is not a swimming clearance.
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Where this data comes from
86 measurements from 3 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Vermont Dept of Environmental Conservation
1VTDECWQ86 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
- 2130 B ~ Nephelometric Method
Monitoring station identifiers (3)
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)