Wedge Pond
Middlesex County, Massachusetts21 acresView mapDirections
MassDEP publishes the water-quality measurements for Wedge Pond. Here is what has been measured.
- Hypereutrophic
- Impaired · Algal growth
- Limited data
Wedge Pond in Middlesex County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Chlorophyll-a (algae): 70.4 µg/L. Surface area: 21 acres.
Wedge Pond is a 21-acre highly nutrient-loaded hypereutrophic lake in Middlesex County, Massachusetts. Compared to the 10 other monitored lakes in Middlesex County, Wedge Pond ranks #11 for water quality.
Source: EPA Water Quality Portal sampling records, MassDEP, last sampled 2019-10-29. Methodology: how these readings are compared.
Swimming conditions
Readings onlyRecreation use not supported
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. Wedge Pond is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, nutrients (phosphorus, nitrogen), oxygen depletion (low DO). Check local advisories before you swim.
Whether Wedge Pond is safe to swim in today is a call for the Massachusetts Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Wedge Pond
These are the measurements MassDEP publishes for Wedge Pond, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Chlorophyll-a 70.4 µg/L. TSI 72.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | 70.4µg/L | Poor GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 72 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Wedge Pond
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
21 acres
No bathymetric survey has been published for Wedge Pond, so its depth is not documented here.
Stays via Stay22
Stays near Wedge Pond
Compare lakeside cabins, hotels, and vacation rentals near Wedge Pond in Middlesex County, Massachusetts — 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. The water-quality readings cover nutrients and algae, not lodging. Cabins and rentals around Wedge Pond are listed below.
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Fishing Wedge Pond
Reservoir Info (USACE NID)
Wedge Pond is a man-made reservoir impounded by the Wedge Pond Dam (completed 1900), built primarily for recreation on the Horn Pond Brook, tributary to Aberjona River; earth-type dam, 9 ft tall and 60 ft long.
- Surface area
- 21 ac
- Normal storage
- 168 ac-ft
- Max storage
- 490 ac-ft
- Drainage area
- 10.8 sq mi
- Hazard class
- Low
- Owner
- Town of Winchester
Source: USACE National Inventory of Dams, NID ID MA01125 · Operator website
EPA Impairment Status
Wedge Pond is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life, Recreation, Other.
Source: EPA ATTAINS assessment unit MA71045 · Official waterbody report
Nearby Lakes in Middlesex County
Frequently asked questions about Wedge Pond
Where is Wedge Pond?
- Wedge Pond is a lake in Middlesex County, Massachusetts. Its water-quality measurements are published by MassDEP and shown on this page as reported.
What is the water quality of Wedge Pond?
- Wedge Pond in Middlesex County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Chlorophyll-a (algae): 70.4 µg/L. Surface area: 21 acres.
Is Wedge Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Wedge Pond is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, nutrients (phosphorus, nitrogen), oxygen depletion (low DO). Check local advisories before you swim.
Explore Wedge Pond across LakeQuality
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Where this data comes from
5 measurements from 1 monitoring station, 2019. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Massachusetts Department of Environmental Protection (MassDEP)
MASSDEP5 samples · 2019
Analytical methods
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
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