Coonamessett Pond is a productive, nutrient-rich eutrophic lake in Barnstable County, Massachusetts. Water quality is graded C based on 1 sampling years through 2018. Limited fish-species data available. Public access is available with 2 public boat landings. Compared to the 12 other monitored lakes in Barnstable County, Coonamessett Pond ranks #9 for water quality.
Source: EPA Water Quality Portal sampling records, Massachusetts DNR, last sampled 2018-09-13. Grade methodology: LakeGrade methodology.
Watch Coonamessett Pond water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Swim with caution, moderate algae may be present
Water Quality Grade: C, Fair
No clarity data. Chlorophyll-a: 16.7 µg/L. Trophic State Index: 58.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 16.7 µg/L | C |
| Trophic State Index (TSI) | 58 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Coonamessett Pond
Compare lakeside cabins, hotels, and vacation rentals near Coonamessett Pond in Barnstable 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.
Top-rated places to stay near Coonamessett Pond
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Coonamessett Pond?
Get lake water-quality report cards plus the best cabin & lodging deals near Coonamessett Pond — straight to your inbox. No spam, unsubscribe anytime.
Planning a whole trip? See where to stay at Massachusetts’s top lakes →
Fishing Coonamessett Pond
Recreation & Access
Location
County Ranking
Ranked #9 of 13 lakes in Barnstable County
Nearby Lakes in Barnstable County
Explore Coonamessett Pond across LakeGrade
Species activity outlook by water temperature and season
Where to stay at Massachusetts's top lakes, each with its grade
High nutrients, frequent algae, reduced clarity
Massachusetts's cleanest and most-polluted lakes, ranked
More Massachusetts Lake Rankings
Top 25 by overall water quality score
Top 25 by Secchi water clarity
Grade A/B + low algae filter
Panfish-rich, public access
Full state directory
Other Grade C Lakes in Massachusetts
Eutrophic Lakes in Massachusetts
More records, surveys & data sources
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2018-09-13
Monitoring stations: 1