Sullivan Lake
Lake County, Illinois57 acresView mapDirections
No nutrient or algae sampling on record from Illinois EPA for this lake.
- Impaired · Cause unknown
- 11 ft max depth
Sullivan Lake in Lake County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Maximum depth: 10.5 ft. Surface area: 57 acres.
Sullivan Lake is a 57-acre lake in Lake County, Illinois with a maximum depth of 11 feet (2-foot average).
Source: EPA Water Quality Portal sampling records, Illinois EPA. Methodology: how these readings are compared.
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Sullivan Lake is listed impaired under Clean Water Act §303(d) (IR 5) for cause unknown, noxious aquatic plants. Check local advisories before you swim.
Whether Sullivan Lake is safe to swim in today is a call for the Illinois Environmental Protection Agency and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Sullivan Lake
These are the measurements Illinois EPA publishes for Sullivan 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. TSI undefined.
Ask about Sullivan Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
10.5 ft
Average depth
2.1 ft
Surface area
57 acres
Shoreline
1.8 mi
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Stays near Sullivan Lake
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Fishing Sullivan Lake
EPA Impairment Status
Sullivan 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: Other.
Source: EPA ATTAINS assessment unit IL_RTZL · Official waterbody report
Nearby Lakes in Lake County
Frequently asked questions about Sullivan Lake
Where is Sullivan Lake?
- Sullivan Lake is a lake in Lake County, Illinois. Its water-quality measurements are published by Illinois EPA and shown on this page as reported.
What is the water quality of Sullivan Lake?
- Sullivan Lake in Lake County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Maximum depth: 10.5 ft. Surface area: 57 acres.
Is Sullivan Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Sullivan Lake is listed impaired under Clean Water Act §303(d) (IR 5) for cause unknown, noxious aquatic plants. Check local advisories before you swim.
How deep is Sullivan Lake?
- Sullivan Lake has a maximum depth of 10.5 feet and an average depth of 2.1 feet. The lake covers 57 acres.
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Where this data comes from
Measurements for Sullivan Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database