Long Lake
Porter County, Indiana67 acresView mapDirections
IDEM publishes the water-quality measurements for Long Lake. Here is what has been measured.
- Eutrophic
- Impaired · Mercury
Long Lake in Porter County, Indiana has water-quality measurements published by IDEM, shown here as reported. Phosphorus: 27 µg/L. Chlorophyll-a (algae): 8 µg/L. Surface area: 67 acres.
Long Lake is a 67-acre productive, nutrient-rich eutrophic lake in Porter County, Indiana.
Source: EPA Water Quality Portal sampling records, IDEM, last sampled 2023-08-15. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLow algae
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. Long Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, pCBs. Check local advisories before you swim.
Whether Long Lake is safe to swim in today is a call for the Indiana Department of Environmental Management and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Long Lake
These are the measurements IDEM publishes for Long Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 27 µg/L. Chlorophyll-a 8 µg/L.
| 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 | 27µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 8µg/L | Good GoodFairPoor |
High nutrients, frequent algae, reduced clarity
Ask about Long Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
67 acres
Shoreline
3.6 mi
No bathymetric survey has been published for Long Lake, so its depth is not documented here.
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Stays near Long Lake
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Fishing Long Lake
EPA Impairment Status
Long Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Fish consumption.
Source: EPA ATTAINS assessment unit INK01P1091_00 · Official waterbody report
Nearby Lakes in Porter County
Frequently asked questions about Long Lake
Where is Long Lake?
- Long Lake is a lake in Porter County, Indiana. Its water-quality measurements are published by IDEM and shown on this page as reported.
What is the water quality of Long Lake?
- Long Lake in Porter County, Indiana has water-quality measurements published by IDEM, shown here as reported. Phosphorus: 27 µg/L. Chlorophyll-a (algae): 8 µg/L. Surface area: 67 acres.
Is Long Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Long Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, pCBs. Check local advisories before you swim.
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Where this data comes from
Measurements for Long Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
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