Flint Lake
Porter County, Indiana107 acresView mapDirections
IDEM publishes the water-quality measurements for Flint Lake. Here is what has been measured.
- Eutrophic
- Impaired · Mercury
- 71 ft max depth
- Limited data
Flint Lake in Porter County, Indiana has water-quality measurements published by IDEM, shown here as reported. Phosphorus: 28 µg/L. Chlorophyll-a (algae): 10 µg/L. Maximum depth: 70.9 ft. Surface area: 107 acres.
Flint Lake is a 107-acre productive, nutrient-rich eutrophic lake in Porter County, Indiana with a maximum depth of 71 feet (20-foot average).
Source: EPA Water Quality Portal sampling records, IDEM, last sampled 2023-07-14. Methodology: how these readings are compared.
What Flint Lake is good for
From access and monitoring records, not editorial picks.
- Deep water70.9 ft surveyed max depth
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. Flint Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, pCBs. Check local advisories before you swim.
Whether Flint 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 Flint Lake
These are the measurements IDEM publishes for Flint 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 28 µg/L. Chlorophyll-a 10 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 | 28µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 10µg/L | Good GoodFairPoor |
High nutrients, frequent algae, reduced clarity
Ask about Flint Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
70.9 ft
Average depth
20 ft
Surface area
107 acres
Shoreline
2.6 mi
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Fishing Flint Lake
EPA Impairment Status
Flint 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 INK01P1089_00 · Official waterbody report
Nearby Lakes in Porter County
Frequently asked questions about Flint Lake
Where is Flint Lake?
- Flint 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 Flint Lake?
- Flint Lake in Porter County, Indiana has water-quality measurements published by IDEM, shown here as reported. Phosphorus: 28 µg/L. Chlorophyll-a (algae): 10 µg/L. Maximum depth: 70.9 ft. Surface area: 107 acres.
Is Flint Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Flint Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, pCBs. Check local advisories before you swim.
How deep is Flint Lake?
- Flint Lake has a maximum depth of 70.9 feet and an average depth of 20 feet. The lake covers 107 acres.
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Where this data comes from
Measurements for Flint 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