Ames Long Pond
Bristol County, Massachusetts95 acresView mapDirections
Nutrients and algae run above the regional average.
↓ down from B at the last regrade
- Eutrophic
- Impaired · Algal growth
- #4 of 5 in the county
- 28 ft max depth
- Limited data
Ames Long Pond in Bristol County, Massachusetts has a water quality grade of D (Nutrient-rich). Chlorophyll-a (algae): 9.1 µg/L. Surface area: 94.7 acres.
- Max depth
- ~28 ft est.
- Area
- 95 acres
- Type
- Eutrophic
- Chlorophyll-a
- 9.1 µg/L
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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 grade measures nutrients and algae, not lodging — cabins and rentals around Ames Long Pond are listed below.
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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. Water quality is graded D based on 1 sampling years through 2018. 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. 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 D is nutrients and algae, 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.
Water Quality Grade: D (Nutrient-rich)
No clarity data. Chlorophyll-a 9.1 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) | 9.1 µg/L | Poor |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~28 ft est. |
| Average Depth | ~13 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
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 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
Source: EPA ATTAINS assessment unit MA62001 · Official waterbody report
County Ranking
Ranked #4 of 5 lakes in Bristol County
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. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Ames Long Pond?
- Ames Long Pond in Bristol County, Massachusetts has a water quality grade of D (Nutrient-rich). Chlorophyll-a (algae): 9.1 µg/L. Surface area: 94.7 acres.
Is Ames Long Pond safe to swim in?
- The D is nutrients and algae, 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.
Explore Ames Long Pond across LakeQuality
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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)