Ames Long Pond
Bristol County, Massachusetts95 acresView mapDirections
MassDEP publishes the water-quality measurements for Ames Long Pond. Here is what has been measured.
- Eutrophic
- Impaired · Algal growth
- 28 ft max depth
- Limited data
Ames Long Pond in Bristol County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Chlorophyll-a (algae): 9.1 µg/L. Surface area: 94.7 acres.
Ames Long Pond is a 95-acre productive, nutrient-rich eutrophic lake in Bristol County, Massachusetts with an estimated average depth of about 28 feet. Compared to the 4 other monitored lakes in Bristol County, Ames Long Pond ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, MassDEP, last sampled 2018-08-23. Methodology: how these readings are compared.
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. Ames Long Pond is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, noxious aquatic plants, nuisance exotic species, nutrients (phosphorus, nitrogen), turbidity. Check local advisories before you swim.
Whether Ames Long 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 Ames Long Pond
These are the measurements MassDEP publishes for Ames Long 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 9.1 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) | 9.1µg/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. | 52 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Ames Long Pond
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~28 ft est.
Surface area
95 acres
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Massachusetts has not published bathymetry for Ames Long Pond.
Lake Size & Watershed
Watershed (drainage) area
5 sq mi
HydroLAKES / HydroSHEDS
Shoreline
2.2 mi
HydroLAKES / HydroSHEDS
Elevation
190 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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Stays near Ames Long Pond
Compare lakeside cabins, hotels, and vacation rentals near Ames Long Pond in Bristol 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 Ames Long Pond are listed below.
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Fishing Ames Long Pond
Reservoir Info (USACE NID)
Ames Long Pond is a man-made reservoir impounded by the Long Pond Dam, built primarily for recreation on the Queset Brook; earth-type dam, 14 ft tall and 900 ft long.
- Surface area
- 94.7 ac
- Normal storage
- 344 ac-ft
- Max storage
- 407 ac-ft
- Drainage area
- 2.54 sq mi
- Hazard class
- Significant
- Owner
- Town of Easton
All listed purposes: Recreation;Other.
Source: USACE National Inventory of Dams, NID ID MA02407 · Operator website · Matched by proximity (0.12 km)
EPA Impairment Status
Ames Long 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 MA62001 · Official waterbody report
Nearby Lakes in Bristol County
Frequently asked questions about Ames Long Pond
Where is Ames Long Pond?
- Ames Long Pond is a lake in Bristol County, Massachusetts. Its water-quality measurements are published by MassDEP and shown on this page as reported.
What is the water quality of Ames Long Pond?
- Ames Long Pond in Bristol County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Chlorophyll-a (algae): 9.1 µg/L. Surface area: 94.7 acres.
Is Ames Long Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Ames Long Pond is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, noxious aquatic plants, nuisance exotic species, nutrients (phosphorus, nitrogen), turbidity. Check local advisories before you swim.
How deep is Ames Long Pond?
- No published bathymetric survey covers Ames Long Pond, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 28 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 94.7 acres.
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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)