Mashipacong Pond
Sussex County, New Jersey50 acresView mapDirections
NJDEP publishes the water-quality measurements for Mashipacong Pond. Here is what has been measured.
- Mesotrophic
- Impaired · Metals (other than mercury)
- Limited data
Mashipacong Pond in Sussex County, New Jersey has water-quality measurements published by NJDEP, shown here as reported. Water clarity: 9.7 ft visibility. Phosphorus: 10.8 µg/L. Chlorophyll-a (algae): 5.2 µg/L. Surface area: 50 acres.
Mashipacong Pond is a 50-acre mesotrophic lake in Sussex County, New Jersey. Compared to the 17 other monitored lakes in Sussex County, Mashipacong Pond ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-08-06. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLimited data
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. Mashipacong Pond is listed impaired under Clean Water Act §303(d) (IR 5) for metals (other than mercury), temperature. Check local advisories before you swim.
Whether Mashipacong Pond is safe to swim in today is a call for the New Jersey Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Mashipacong Pond
These are the measurements NJDEP publishes for Mashipacong Pond, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 9.7 ft. Phosphorus 10.8 µg/L. Chlorophyll-a 5.2 µg/L. TSI 43.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 9.7ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 10.8µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 5.2µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 43 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Mashipacong Pond
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
50 acres
No bathymetric survey has been published for Mashipacong Pond, so its depth is not documented here.
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Fishing Mashipacong Pond
Reservoir Info (USACE NID)
Mashipacong Pond is a man-made reservoir impounded by the Mashipacong Pond Dam, built primarily for recreation on the Parker Brook; earth-type dam, 12 ft tall and 300 ft long.
- Surface area
- 50 ac
- Normal storage
- 210 ac-ft
- Drainage area
- 0.7 sq mi
- Hazard class
- Low
- Owner
- The Nature Conservancy
Source: USACE National Inventory of Dams, NID ID NJ00494 · Operator website
EPA Impairment Status
Mashipacong 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: Drinking water, Aquatic life.
Source: EPA ATTAINS assessment unit NJ02040104140020-01 · Official waterbody report
Nearby Lakes in Sussex County
Frequently asked questions about Mashipacong Pond
Where is Mashipacong Pond?
- Mashipacong Pond is a lake in Sussex County, New Jersey. Its water-quality measurements are published by NJDEP and shown on this page as reported.
What is the water quality of Mashipacong Pond?
- Mashipacong Pond in Sussex County, New Jersey has water-quality measurements published by NJDEP, shown here as reported. Water clarity: 9.7 ft visibility. Phosphorus: 10.8 µg/L. Chlorophyll-a (algae): 5.2 µg/L. Surface area: 50 acres.
Is Mashipacong Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Mashipacong Pond is listed impaired under Clean Water Act §303(d) (IR 5) for metals (other than mercury), temperature. Check local advisories before you swim.
Explore Mashipacong Pond across LakeQuality
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Where this data comes from
25 measurements from 1 monitoring station, 2021–2024. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- NJDEP Bureau of Freshwater and Biological Monitoring
NJDEP_BFBM25 samples · 2021–2024
Analytical methods
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- 2120 B ~ Color in Water by Visual Comparison
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