Wedge Pond
Middlesex County, Massachusetts21 acresView mapDirections
Nutrients and algae run well above the regional average.
- Hypereutrophic
- Impaired · Algal growth
- #11 of 11 in the county
- Limited data
Wedge Pond in Middlesex County, Massachusetts has a water quality grade of F (Algae-prone). Chlorophyll-a (algae): 70.4 µg/L. Surface area: 21 acres.
- Area
- 21 acres
- Type
- Hypereutrophic
- Chlorophyll-a
- 70.4 µg/L
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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 grade measures nutrients and algae, not lodging — cabins and rentals around Wedge Pond are listed below.
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Watch Wedge Pond’s letter
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Wedge Pond is a 21-acre highly nutrient-loaded hypereutrophic lake in Middlesex County, Massachusetts. Water quality is graded F based on 1 sampling years through 2019. 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. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLimited data
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 F is nutrients and algae, 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.
Water Quality Grade: F (Algae-prone)
No clarity data. Chlorophyll-a 70.4 µg/L. TSI 72. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 70.4 µg/L | Poor |
| Trophic State Index (TSI) | 72 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 21 acres |
No bathymetric survey has been published for Wedge Pond, so its depth is not documented here.
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
Source: EPA ATTAINS assessment unit MA71045 · Official waterbody report
County Ranking
Ranked #11 of 11 lakes in Middlesex County
Nearby Lakes in Middlesex County
Frequently asked questions about Wedge Pond
Where is Wedge Pond?
- Wedge Pond is a lake in Middlesex County, Massachusetts. LakeQuality grades it F for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Wedge Pond?
- Wedge Pond in Middlesex County, Massachusetts has a water quality grade of F (Algae-prone). Chlorophyll-a (algae): 70.4 µg/L. Surface area: 21 acres.
Is Wedge Pond safe to swim in?
- The F is nutrients and algae, 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
Species activity outlook by water temperature and season
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Very high nutrients, dense algae, poor clarity
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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)
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
Impairment status from EPA ATTAINS 303(d) database