Nashawannuck Pond
Hampshire County, Massachusetts30 acresView mapDirections
Nutrients and algae run well above the regional average.
- Hypereutrophic
- Impaired · Noxious aquatic plants
- #4 of 4 in the county
- Public access
- Limited data
Nashawannuck Pond in Hampshire County, Massachusetts has a water quality grade of F (Algae-prone). Chlorophyll-a (algae): 32.4 µg/L. Surface area: 30 acres.
- Area
- 30 acres
- Type
- Hypereutrophic
- Chlorophyll-a
- 32.4 µg/L
- Public access
- Yes
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Stays near Nashawannuck Pond
Compare lakeside cabins, hotels, and vacation rentals near Nashawannuck Pond in Hampshire 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 Nashawannuck Pond are listed below.
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Watch Nashawannuck Pond’s letter
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Nashawannuck Pond is a 30-acre highly nutrient-loaded hypereutrophic lake in Hampshire County, Massachusetts. Water quality is graded F based on 1 sampling years through 2016. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 3 other monitored lakes in Hampshire County, Nashawannuck Pond ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, MassDEP, last sampled 2016-09-15. Grade methodology: LakeQuality methodology.
What Nashawannuck Pond is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
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. Nashawannuck Pond is listed impaired under Clean Water Act §303(d) (IR 5) for noxious aquatic plants, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Water Quality Grade: F (Algae-prone)
No clarity data. Chlorophyll-a 32.4 µg/L. TSI 65. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 32.4 µg/L | Poor |
| Trophic State Index (TSI) | 65 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 30 acres |
| Public Access | Yes |
No bathymetric survey has been published for Nashawannuck Pond, so its depth is not documented here.
Recreation & Access
- Nashawannuck PondPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Nashawannuck Pond
Reservoir Info (USACE NID)
Nashawannuck Pond is a man-made reservoir impounded by the Cottage Street Dam, built primarily for recreation on the Broad Brook and White Brook, tributary to Manhan River; earth-type dam, 25 ft tall and 300 ft long.
- Surface area
- 30 ac
- Normal storage
- 305 ac-ft
- Max storage
- 435 ac-ft
- Drainage area
- 10.2 sq mi
- Hazard class
- High
- Owner
- City of Easthampton
Source: USACE National Inventory of Dams, NID ID MA00487 · Operator website
EPA Impairment Status
Nashawannuck 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 MA34057 · Official waterbody report
County Ranking
Ranked #4 of 4 lakes in Hampshire County
Nearby Lakes in Hampshire County
Frequently asked questions about Nashawannuck Pond
Where is Nashawannuck Pond?
- Nashawannuck Pond is a lake in Hampshire County, Massachusetts. LakeQuality grades it F for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Nashawannuck Pond?
- Nashawannuck Pond in Hampshire County, Massachusetts has a water quality grade of F (Algae-prone). Chlorophyll-a (algae): 32.4 µg/L. Surface area: 30 acres.
Is Nashawannuck Pond safe to swim in?
- The F is nutrients and algae, not a swimming clearance. Nashawannuck Pond is listed impaired under Clean Water Act §303(d) (IR 5) for noxious aquatic plants, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Are there boat ramps on Nashawannuck Pond?
- Nashawannuck Pond has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Nashawannuck Pond. Public access is listed as yes.
Explore Nashawannuck Pond across LakeQuality
Species activity outlook by water temperature and season
Where to stay at Massachusetts's top lakes, each with its grade
Very high nutrients, dense algae, poor clarity
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Where this data comes from
3 measurements from 1 monitoring station, 2016. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Massachusetts Department of Environmental Protection (MassDEP)
MASSDEP3 samples · 2016
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
Named boat-access points from the USGS National Boat Ramps inventory