Indian Mills Lake
Burlington County, New Jersey40 acresView mapDirections
NJDEP publishes the water-quality measurements for Indian Mills Lake. Here is what has been measured.
- Eutrophic
- Impaired · pH / acidity
Indian Mills Lake in Burlington County, New Jersey has water-quality measurements published by NJDEP, shown here as reported. Water clarity: 1.6 ft visibility. Phosphorus: 56.8 µg/L. Chlorophyll-a (algae): 24.1 µg/L. Surface area: 40 acres.
Indian Mills Lake is a 40-acre productive, nutrient-rich eutrophic lake in Burlington County, New Jersey. Compared to the 11 other monitored lakes in Burlington County, Indian Mills Lake ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2021-10-12. Methodology: how these readings are compared.
Swimming conditions
Readings onlyAlgae risk
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. Indian Mills Lake is listed impaired under Clean Water Act §303(d) (IR 5) for pH / acidity. Check local advisories before you swim.
Whether Indian Mills Lake 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 Indian Mills Lake
These are the measurements NJDEP publishes for Indian Mills Lake, 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 1.6 ft of visibility. Phosphorus 56.8 µg/L. Chlorophyll-a 24.1 µg/L. TSI 65.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 56.8µg/L | Fair GoodFairPoor |
| Chlorophyll-a (algae) | 24.1µg/L | Fair GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 65 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
40 acres
No bathymetric survey has been published for Indian Mills Lake, so its depth is not documented here.
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Fishing Indian Mills Lake
Reservoir Info (USACE NID)
Indian Mills Lake is a man-made reservoir impounded by the Indian Mills Dam (completed 1807), built primarily for recreation on the Muskingum Brook; earth-type dam, 11 ft tall and 600 ft long.
- Surface area
- 40 ac
- Normal storage
- 160 ac-ft
- Max storage
- 267 ac-ft
- Drainage area
- 5.8 sq mi
- Hazard class
- Significant
- Owner
- Township of Shamong
Source: USACE National Inventory of Dams, NID ID NJ00042 · Operator website
EPA Impairment Status
Indian Mills Lake 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.
Source: EPA ATTAINS assessment unit NJ02040301150030-01 · Official waterbody report
Nearby Lakes in Burlington County
Frequently asked questions about Indian Mills Lake
Where is Indian Mills Lake?
- Indian Mills Lake is a lake in Burlington County, New Jersey. Its water-quality measurements are published by NJDEP and shown on this page as reported.
What is the water quality of Indian Mills Lake?
- Indian Mills Lake in Burlington County, New Jersey has water-quality measurements published by NJDEP, shown here as reported. Water clarity: 1.6 ft visibility. Phosphorus: 56.8 µg/L. Chlorophyll-a (algae): 24.1 µg/L. Surface area: 40 acres.
Is Indian Mills Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Indian Mills Lake is listed impaired under Clean Water Act §303(d) (IR 5) for pH / acidity. Check local advisories before you swim.
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Where this data comes from
51 measurements from 2 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_BFBM51 samples · 2020–2021
Analytical methods
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
Monitoring station identifiers (2)
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