Monponsett Pond
Plymouth County, MassachusettsView mapDirections
MassDEP publishes the water-quality measurements for Monponsett Pond. Here is what has been measured.
- Eutrophic
- Impaired · Algal growth
- 39 ft max depth
- Public access
- Limited data
Monponsett Pond in Plymouth County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Chlorophyll-a (algae): 13 µg/L.
Monponsett Pond is a productive, nutrient-rich eutrophic lake in Plymouth County, Massachusetts with an estimated average depth of about 39 feet. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 11 other monitored lakes in Plymouth County, Monponsett Pond ranks #9 for water quality.
Source: EPA Water Quality Portal sampling records, MassDEP, last sampled 2019-09-17. Methodology: how these readings are compared.
What Monponsett Pond is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
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. Monponsett Pond is listed impaired under Clean Water Act §303(d) (IR 4A) for algal growth, mercury, nuisance exotic species, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Monponsett 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 Monponsett Pond
These are the measurements MassDEP publishes for Monponsett 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 13 µg/L. TSI 56.
| 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) | 13µg/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. | 56 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Monponsett Pond
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~39 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 Monponsett Pond.
Lake Size & Watershed
Watershed (drainage) area
9 sq mi
HydroLAKES / HydroSHEDS
Surface area
514 acres
HydroLAKES / HydroSHEDS
Shoreline
7.1 mi
HydroLAKES / HydroSHEDS
Elevation
62 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.
Recreation & Access
- Monponsett PondPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Monponsett Pond
Compare lakeside cabins, hotels, and vacation rentals near Monponsett Pond in Plymouth 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 Monponsett Pond are listed below.
Top-rated places to stay near Monponsett Pond
Prices for Oct 30–Nov 1, 4 adults. Change dates on the map below.
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Fishing Monponsett Pond
Water Quality Trend: Improving
Based on 8 years of monitoring (2012–2019).
Chlorophyll-a
Improving-4.01 µg/L/yr8 years
EPA Impairment Status
Monponsett Pond is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Aquatic life, Fish consumption, Recreation, Other.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MA62218 · Official waterbody report
Nearby Lakes in Plymouth County
Frequently asked questions about Monponsett Pond
Where is Monponsett Pond?
- Monponsett Pond is a lake in Plymouth County, Massachusetts. Its water-quality measurements are published by MassDEP and shown on this page as reported.
What is the water quality of Monponsett Pond?
- Monponsett Pond in Plymouth County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Chlorophyll-a (algae): 13 µg/L.
Is Monponsett Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Monponsett Pond is listed impaired under Clean Water Act §303(d) (IR 4A) for algal growth, mercury, nuisance exotic species, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Monponsett Pond?
- No published bathymetric survey covers Monponsett Pond, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 39 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Are there boat ramps on Monponsett Pond?
- Monponsett Pond has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Monponsett Pond. Public access is listed as yes.
Can I fish at Monponsett Pond?
- Monponsett Pond has 1 documented boat landing in the USGS National Boat Ramps inventory. 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.
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Where this data comes from
56 measurements from 4 monitoring stations, 2012–2019. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Massachusetts Department of Environmental Protection (MassDEP)
MASSDEP56 samples · 2012–2019
Analytical methods
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
Monitoring station identifiers (4)
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)
Named boat-access points from the USGS National Boat Ramps inventory