New Gillespie Lake
Macoupin County, Illinois205 acresView mapDirections
No nutrient or algae sampling on record from Illinois EPA for this lake.
- Impaired · Mercury
- 28 ft max depth
New Gillespie Lake in Macoupin County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Maximum depth: 28 ft. Surface area: 205 acres.
New Gillespie Lake is a 205-acre lake in Macoupin County, Illinois with a maximum depth of 28 feet (10-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. New Gillespie Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, nutrients (phosphorus, nitrogen), pesticides, turbidity. Check local advisories before you swim.
Whether New Gillespie 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 New Gillespie Lake
These are the measurements Illinois EPA publishes for New Gillespie 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 New Gillespie Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
28 ft
Average depth
10.2 ft
Surface area
205 acres
Shoreline
9.2 mi
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Fishing New Gillespie Lake
EPA Impairment Status
New Gillespie 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, Other.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit IL_SDU · Official waterbody report
Nearby Lakes in Macoupin County
Frequently asked questions about New Gillespie Lake
Where is New Gillespie Lake?
- New Gillespie Lake is a lake in Macoupin County, Illinois. Its water-quality measurements are published by Illinois EPA and shown on this page as reported.
What is the water quality of New Gillespie Lake?
- New Gillespie Lake in Macoupin County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Maximum depth: 28 ft. Surface area: 205 acres.
Is New Gillespie Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. New Gillespie Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, nutrients (phosphorus, nitrogen), pesticides, turbidity. Check local advisories before you swim.
How deep is New Gillespie Lake?
- New Gillespie Lake has a maximum depth of 28 feet and an average depth of 10.2 feet. The lake covers 205 acres.
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Where this data comes from
Measurements for New Gillespie 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