Mashpee Pond
Barnstable County, Massachusetts1 acresView mapDirections
MassDEP publishes the water-quality measurements for Mashpee Pond. Here is what has been measured.
- Eutrophic
- Impaired · Mercury
- 41 ft max depth
- Public access
- Limited data
Mashpee Pond in Barnstable County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Chlorophyll-a (algae): 8.7 µg/L. Surface area: 1 acres.
Mashpee Pond is a 1-acre productive, nutrient-rich eutrophic lake in Barnstable County, Massachusetts with an estimated average depth of about 41 feet. Limited fish-species data available. Public access is available. Compared to the 7 other monitored lakes in Barnstable County, Mashpee Pond ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, MassDEP, last sampled 2018-09-13. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLimited data
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. Mashpee Pond is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, oxygen depletion (low DO). Check local advisories before you swim.
Whether Mashpee 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 Mashpee Pond
These are the measurements MassDEP publishes for Mashpee 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 8.7 µg/L. TSI 52.
| 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) | 8.7µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 52 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Mashpee Pond
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~41 ft est.
Surface area
1 acres
Public access
Yes
Listed by MassDEP
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Massachusetts has not published bathymetry for Mashpee Pond.
Lake Size & Watershed
Watershed (drainage) area
15 sq mi
HydroLAKES / HydroSHEDS
Shoreline
6.6 mi
HydroLAKES / HydroSHEDS
Elevation
72 ft
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.
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Fishing Mashpee Pond
Reservoir Info (USACE NID)
Mashpee Pond is a man-made reservoir impounded by the Mashpee River Fishway Dam, built primarily for other on the Mashpee River; earth-type dam, 12 ft tall and 250 ft long.
- Surface area
- 1 ac
- Normal storage
- 2 ac-ft
- Max storage
- 4,500 ac-ft
- Drainage area
- 14 sq mi
- Hazard class
- Significant
- Owner
- Town of Mashpee
Source: USACE National Inventory of Dams, NID ID MA02552 · Operator website · Matched by proximity (0.85 km)
EPA Impairment Status
Mashpee 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, Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MA96194 · Official waterbody report
Nearby Lakes in Barnstable County
Frequently asked questions about Mashpee Pond
Where is Mashpee Pond?
- Mashpee Pond is a lake in Barnstable County, Massachusetts. Its water-quality measurements are published by MassDEP and shown on this page as reported.
What is the water quality of Mashpee Pond?
- Mashpee Pond in Barnstable County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Chlorophyll-a (algae): 8.7 µg/L. Surface area: 1 acres.
Is Mashpee Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Mashpee Pond is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, oxygen depletion (low DO). Check local advisories before you swim.
How deep is Mashpee Pond?
- No published bathymetric survey covers Mashpee Pond, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 41 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 1 acres.
Can I fish at Mashpee Pond?
- Public access to Mashpee Pond is listed as yes on the lake record. 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.
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Where this data comes from
3 measurements from 1 monitoring station, 2018. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Massachusetts Department of Environmental Protection (MassDEP)
MASSDEP3 samples · 2018
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
Lake size & watershed from HydroLAKES (HydroSHEDS)