Mount Olive Lake
Macoupin County, Illinois40 acresView mapDirections
No nutrient or algae sampling on record from Illinois EPA for this lake.
- Impaired · Mercury
- 18 ft max depth
Mount Olive Lake in Macoupin County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Maximum depth: 18 ft. Surface area: 40 acres.
Mount Olive Lake is a 40-acre lake in Macoupin County, Illinois with a maximum depth of 18 feet (7-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. Mount Olive Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, metals (other than mercury), nutrients (phosphorus, nitrogen), pesticides, turbidity. Check local advisories before you swim.
Whether Mount Olive 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 Mount Olive Lake
These are the measurements Illinois EPA publishes for Mount Olive 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 Mount Olive Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
18 ft
Average depth
7.1 ft
Surface area
40 acres
Shoreline
1.8 mi
Stays via Stay22
Stays near Mount Olive Lake
Compare lakeside cabins, hotels, and vacation rentals near Mount Olive Lake in Macoupin County, Illinois — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Mount Olive Lake
Prices for Oct 9–11, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Illinois’s top lakes →
Follow Mount Olive Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Mount Olive Lake
EPA Impairment Status
Mount Olive 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: Drinking water, Fish consumption, Other.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit IL_RJF · Official waterbody report
Nearby Lakes in Macoupin County
Frequently asked questions about Mount Olive Lake
Where is Mount Olive Lake?
- Mount Olive 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 Mount Olive Lake?
- Mount Olive Lake in Macoupin County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Maximum depth: 18 ft. Surface area: 40 acres.
Is Mount Olive Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Mount Olive Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, metals (other than mercury), nutrients (phosphorus, nitrogen), pesticides, turbidity. Check local advisories before you swim.
How deep is Mount Olive Lake?
- Mount Olive Lake has a maximum depth of 18 feet and an average depth of 7.1 feet. The lake covers 40 acres.
Explore Mount Olive Lake across LakeQuality
More lakes in Illinois
Other Lakes in Illinois
Where this data comes from
Measurements for Mount Olive 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