Lake Lenape
Atlantic County, New Jersey300 acresView mapDirections
NJDEP publishes the water-quality measurements for Lake Lenape. Here is what has been measured.
- Mesotrophic
- Impaired · Mercury
- Public access
- Limited data
Lake Lenape in Atlantic County, New Jersey has water-quality measurements published by NJDEP, shown here as reported. Water clarity: 2.7 ft visibility. Phosphorus: 42.6 µg/L. Chlorophyll-a (algae): 2.4 µg/L. Surface area: 300 acres.
Lake Lenape is a 300-acre mesotrophic lake in Atlantic County, New Jersey. Limited fish-species data available. Public access is available. Compared to the 5 other monitored lakes in Atlantic County, Lake Lenape ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2021-11-17. 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. Lake Lenape is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, metals (other than mercury), pH / acidity, pCBs. Check local advisories before you swim.
Whether Lake Lenape 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 Lake Lenape
These are the measurements NJDEP publishes for Lake Lenape, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 2.7 ft of visibility. Phosphorus 42.6 µg/L. Chlorophyll-a 2.4 µg/L. TSI 53.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2.7ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 42.6µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 2.4µg/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. | 53 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Lake Lenape
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
300 acres
Public access
Yes
Listed by NJDEP
No bathymetric survey has been published for Lake Lenape, so its depth is not documented here.
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Stays near Lake Lenape
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Fishing Lake Lenape
Reservoir Info (USACE NID)
Lake Lenape is a man-made reservoir impounded by the Lake Lenape Dam (completed 1879), built primarily for recreation on the Great Egg Harbor River; earth-type dam, 29 ft tall and 1,050 ft long.
- Surface area
- 300 ac
- Normal storage
- 4,500 ac-ft
- Max storage
- 6,610 ac-ft
- Drainage area
- 205 sq mi
- Hazard class
- High
- Owner
- Township of Hamilton
Source: USACE National Inventory of Dams, NID ID NJ00450 · Operator website
EPA Impairment Status
Lake Lenape 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, Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NJ02040302040130-01 · Official waterbody report
Nearby Lakes in Atlantic County
Frequently asked questions about Lake Lenape
Where is Lake Lenape?
- Lake Lenape is a lake in Atlantic County, New Jersey. Its water-quality measurements are published by NJDEP and shown on this page as reported.
What is the water quality of Lake Lenape?
- Lake Lenape in Atlantic County, New Jersey has water-quality measurements published by NJDEP, shown here as reported. Water clarity: 2.7 ft visibility. Phosphorus: 42.6 µg/L. Chlorophyll-a (algae): 2.4 µg/L. Surface area: 300 acres.
Is Lake Lenape safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lake Lenape is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, metals (other than mercury), pH / acidity, pCBs. Check local advisories before you swim.
Can I fish at Lake Lenape?
- Public access to Lake Lenape is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by New Jersey's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
136 measurements from 4 monitoring stations, 2020–2021. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- NJDEP Bureau of Freshwater and Biological Monitoring
NJDEP_BFBM136 samples · 2020–2021
Analytical methods
- Phosphorus by Colorimetry
- 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