Coonamessett Pond
Barnstable County, MassachusettsView mapDirections
MassDEP publishes the water-quality measurements for Coonamessett Pond. Here is what has been measured.
- Eutrophic
- 30 ft max depth
- Public access
- Limited data
Coonamessett Pond in Barnstable County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Chlorophyll-a (algae): 16.7 µg/L.
Coonamessett Pond is a productive, nutrient-rich eutrophic lake in Barnstable County, Massachusetts with an estimated average depth of about 30 feet. Limited fish-species data available. Public access is available. Compared to the 7 other monitored lakes in Barnstable County, Coonamessett Pond ranks #7 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. Check local advisories before you swim.
Whether Coonamessett 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 Coonamessett Pond
These are the measurements MassDEP publishes for Coonamessett 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 16.7 µg/L. TSI 58.
| 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) | 16.7µg/L | Fair GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 58 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Coonamessett Pond
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~30 ft est.
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 Coonamessett Pond.
Lake Size & Watershed
Watershed (drainage) area
13 sq mi
HydroLAKES / HydroSHEDS
Surface area
146 acres
HydroLAKES / HydroSHEDS
Shoreline
2.5 mi
HydroLAKES / HydroSHEDS
Elevation
49 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 Coonamessett Pond
Nearby Lakes in Barnstable County
Frequently asked questions about Coonamessett Pond
Where is Coonamessett Pond?
- Coonamessett 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 Coonamessett Pond?
- Coonamessett Pond in Barnstable County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Chlorophyll-a (algae): 16.7 µg/L.
Is Coonamessett Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Coonamessett Pond?
- No published bathymetric survey covers Coonamessett Pond, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 30 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Can I fish at Coonamessett Pond?
- Public access to Coonamessett 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.
Explore Coonamessett Pond across LakeQuality
Planning a trip around Cape Cod?
Coonamessett Pond is about 34 miles from Cape Cod National Seashore. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Cape Cod →More lakes in Massachusetts
Other Lakes in Massachusetts
Eutrophic Lakes in Massachusetts
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
Lake size & watershed from HydroLAKES (HydroSHEDS)