Nashawannuck Pond
Hampshire County, Massachusetts30 acresView mapDirections
MassDEP publishes the water-quality measurements for Nashawannuck Pond. Here is what has been measured.
- Hypereutrophic
- Impaired · Noxious aquatic plants
- Public access
- Limited data
Nashawannuck Pond in Hampshire County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Chlorophyll-a (algae): 32.4 µg/L. Surface area: 30 acres.
Nashawannuck Pond is a 30-acre highly nutrient-loaded hypereutrophic lake in Hampshire County, Massachusetts. 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. Methodology: how these readings are compared.
What Nashawannuck Pond is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
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. 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.
Whether Nashawannuck 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 Nashawannuck Pond
These are the measurements MassDEP publishes for Nashawannuck 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 32.4 µg/L. TSI 65.
| 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) | 32.4µg/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. | 65 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Nashawannuck Pond
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
30 acres
Public access
Yes
Listed by MassDEP
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
Stays via Stay22
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 readings cover nutrients and algae, not lodging. Cabins and rentals around Nashawannuck Pond are listed below.
Top-rated places to stay near Nashawannuck Pond
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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
Designated uses not supporting: Aquatic life, Recreation, Other.
Source: EPA ATTAINS assessment unit MA34057 · Official waterbody report
Nearby Lakes in Hampshire County
Frequently asked questions about Nashawannuck Pond
Where is Nashawannuck Pond?
- Nashawannuck Pond is a lake in Hampshire County, Massachusetts. Its water-quality measurements are published by MassDEP and shown on this page as reported.
What is the water quality of Nashawannuck Pond?
- Nashawannuck Pond in Hampshire County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Chlorophyll-a (algae): 32.4 µg/L. Surface area: 30 acres.
Is Nashawannuck Pond safe to swim in?
- Nutrient and algae readings are 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.
Can I fish at Nashawannuck Pond?
- Nashawannuck Pond has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Massachusetts's fish and wildlife agency, so check its current regulations before you go.
Explore Nashawannuck Pond across LakeQuality
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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)
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
Named boat-access points from the USGS National Boat Ramps inventory