Halfway Pond
Plymouth County, MassachusettsView mapDirections
Nutrients and algae sit mid-range for this region.
- Eutrophic
- Impaired · Algal growth
- #8 of 12 in the county
- 56 ft max depth
- Public access
- Limited data
Halfway Pond in Plymouth County, Massachusetts has a water quality grade of C (Fair). Chlorophyll-a (algae): 17.2 µg/L.
- Max depth
- ~56 ft est.
- Type
- Eutrophic
- Chlorophyll-a
- 17.2 µg/L
- Public access
- Yes
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Watch Halfway Pond’s letter
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Halfway Pond is a productive, nutrient-rich eutrophic lake in Plymouth County, Massachusetts with an estimated average depth of about 56 feet. Water quality is graded C based on 1 sampling years through 2018. Limited fish-species data available. Public access is available. Compared to the 11 other monitored lakes in Plymouth County, Halfway Pond ranks #8 for water quality.
Source: EPA Water Quality Portal sampling records, MassDEP, last sampled 2018-09-27. 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 C is nutrients and algae, not a swimming clearance. Halfway Pond is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, mercury. Check local advisories before you swim.
Water Quality Grade: C (Fair)
No clarity data. Chlorophyll-a 17.2 µg/L. TSI 59. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 17.2 µg/L | Fair |
| Trophic State Index (TSI) | 59 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~56 ft est. |
| Average Depth | ~16 ft est. |
| 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 Halfway 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 Halfway Pond
EPA Impairment Status
Halfway 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 MA95178 · Official waterbody report
County Ranking
Ranked #8 of 12 lakes in Plymouth County
Nearby Lakes in Plymouth County
Frequently asked questions about Halfway Pond
Where is Halfway Pond?
- Halfway Pond is a lake in Plymouth County, Massachusetts. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Halfway Pond?
- Halfway Pond in Plymouth County, Massachusetts has a water quality grade of C (Fair). Chlorophyll-a (algae): 17.2 µg/L.
Is Halfway Pond safe to swim in?
- The C is nutrients and algae, not a swimming clearance. Halfway Pond is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, mercury. Check local advisories before you swim.
How deep is Halfway Pond?
- No published bathymetric survey covers Halfway Pond, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 56 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Halfway Pond across LakeQuality
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
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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)