Mashpee Pond
Barnstable County, Massachusetts1 acresView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
- Eutrophic
- Impaired · Mercury
- #3 of 8 in the county
- 41 ft max depth
- Public access
- Limited data
Mashpee Pond in Barnstable County, Massachusetts has a water quality grade of B (Good). Chlorophyll-a (algae): 8.7 µg/L. Surface area: 1 acres.
- Max depth
- ~41 ft est.
- Area
- 1 acres
- Type
- Eutrophic
- Chlorophyll-a
- 8.7 µg/L
- Public access
- Yes
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Watch Mashpee Pond’s letter
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Mashpee Pond is a 1-acre productive, nutrient-rich eutrophic lake in Barnstable County, Massachusetts with an estimated average depth of about 41 feet. Water quality is graded B based on 1 sampling years through 2018. 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. 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 B is nutrients and algae, 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.
Water Quality Grade: B (Good)
No clarity data. Chlorophyll-a 8.7 µg/L. TSI 52. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 8.7 µg/L | Good |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~41 ft est. |
| Average Depth | ~15 ft est. |
| Surface Area | 1 acres |
| Public Access | Yes |
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
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.
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
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MA96194 · Official waterbody report
County Ranking
Ranked #3 of 8 lakes in Barnstable County
Nearby Lakes in Barnstable County
Frequently asked questions about Mashpee Pond
Where is Mashpee Pond?
- Mashpee Pond is a lake in Barnstable County, Massachusetts. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Mashpee Pond?
- Mashpee Pond in Barnstable County, Massachusetts has a water quality grade of B (Good). Chlorophyll-a (algae): 8.7 µg/L. Surface area: 1 acres.
Is Mashpee Pond safe to swim in?
- The B is nutrients and algae, 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.
Explore Mashpee Pond across LakeQuality
Species activity outlook by water temperature and season
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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)
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
Lake size & watershed from HydroLAKES (HydroSHEDS)